Living timeline·Economy

Medicare Advantage's Retreat: From the 2026 Rate Hike to the 2027 Plan Exits and Open Enrollment

Updated Sep 9, 2026 · 34 dated entries · 40 sources from 24/7 Wall St., Centers for Medicare & Medicaid Services, U.S. District Court for the Southern District of Georgia order, reproduced by Justia, Becker's Payer Issues and 21 more

Edited by Ceniy Mei · How this page is made

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Reading a paper and drinking coffee, illustrating Medicare Advantage's Retreat: From the 2026 Rate Hike to the 2027 Plan Exits and Open Enrollment
Photo by Joseph Sintum on Unsplash
TL;DR

CMS began this cycle by raising 2026 Medicare Advantage payments 5.06%, but plans then faced higher medical costs, risk-adjustment enforcement, and sharp pressure on 2027 bids. CMS’s final 2027 update of 2.48% was materially higher than its near-flat proposal, yet still below the prior year’s update and below cost trends cited by insurers; UnitedHealthcare and Humana have responded with benefit changes and plan exits affecting large numbers of members. Enrollment has continued to grow, though much more slowly and unevenly, with Humana gaining members while UnitedHealthcare and several rivals lost them. The rules for recovering RADV audit overpayments and for calculating star-rating bonuses remain unsettled after court challenges, while affected members await non-renewal notices and the October-to-December 2027-plan enrollment period.

Key moments

12 entries that carry the story, oldest first. The full timeline follows.

  1. Apr 7, 2025CMS finalizes 2026 Medicare Advantage rates: a 5.06 percent increase, about $25 billion more for plans
  2. May 21, 2025CMS says it will audit every Medicare Advantage contract every year and clear the 2018 to 2024 backlog
  3. Sep 25, 2025Judge O'Connor vacates the 2023 RADV audit rule that let CMS extrapolate overpayments
  4. Jan 26, 20262027 advance notice proposes an almost flat 0.09 percent payment update
  5. Apr 6, 2026CMS finalizes 2027 rates at 2.48 percent, over $13 billion, up from the near-zero proposal
  6. May 27, 2026Clover wins a ruling that CMS exceeded its authority on ten star-ratings measures
  7. Jun 17, 2026CMS begins recalculating certain 2027 quality bonus ratings
  8. Jul 16, 2026UnitedHealth's MA membership is down 965,000 since year-end as it plans 'selective changes in market participation' for 2027
  9. Jul 21, 2026CMS files notice appealing Clover star-ratings ruling
  10. Jul 29, 2026Humana will drop 2027 plans covering about 600,000 members, 8 percent of its base
  11. Aug 28, 2026CMS defers decision on collecting extrapolated RADV overpayments
  12. Sep 5, 2026Plan non-renewal letters are due by October 2; open enrollment runs October 15 to December 7

Timeline

2026Apr 2025Sep 2026TodayApr 7, 2025: CMS finalizes 2026 Medicare Advantage rates: a 5.06 percent increase, about $25 billion more for plansMay 21, 2025: CMS says it will audit every Medicare Advantage contract every year and clear the 2018 to 2024 backlogJun 23, 2025: Insurers pledge to Kennedy and Oz to cut prior authorization by 2026 and standardize it by 2027Jul 24, 2025: UnitedHealth confirms criminal and civil Justice Department investigations into its Medicare businessJul 29, 2025: UnitedHealthcare will exit plans serving more than 600,000 Medicare Advantage members in 2026Jul 30, 2025: Humana's 2025 plan and county exits touch about 560,000 members; it trims the expected loss to 500,000Sep 25, 2025: Judge O'Connor vacates the 2023 RADV audit rule that let CMS extrapolate overpaymentsSep 26, 2025: CMS projects the first fall in Medicare Advantage enrollment, to 34 million, as 2026 plans are filedOct 2, 2025: UnitedHealthcare confirms full exits from 16 markets, 109 fewer counties, for 2026Oct 9, 2025: 2026 star ratings: 40 percent of MA-PD contracts at four stars or better, covering 64 percent of enrolleesOct 14, 2025: Humana loses its second lawsuit over the 2025 star ratings, a day before open enrollmentJan 14, 2026: Kaiser Permanente affiliates agree to pay $556 million in FCA settlementJan 26, 2026: 2027 advance notice proposes an almost flat 0.09 percent payment updateJan 27, 2026: UnitedHealth expects to shed 1.3 to 1.4 million Medicare Advantage members in 2026Feb 11, 2026: Humana guides to 25 percent individual MA growth for 2026 as rivals retreat, despite a star-ratings hitFeb 24, 2026: Enrollment data: MA grows only 3 percent to 35.5 million; UnitedHealthcare down 9 percent since OctoberApr 2, 2026: 2027 final rule reshapes star ratings and rolls back 2023 marketing safeguardsApr 6, 2026: CMS finalizes 2027 rates at 2.48 percent, over $13 billion, up from the near-zero proposalMay 27, 2026: Clover wins a ruling that CMS exceeded its authority on ten star-ratings measuresMay 27, 2026: Elevance Health wires $342.2 million to CMSJun 2026: Presbyterian Healthcare Services plans to end most MA plans in 2027Jun 5, 2026: KFF: Medicare Advantage holds 55 percent of eligible beneficiaries, but employer-group enrollment falls for the first time since 2010Jun 9, 2026: CMS recalculates Clover rating to 4.5 starsJun 17, 2026: CMS begins recalculating certain 2027 quality bonus ratingsJul 1, 2026: Lloyd Doggett and colleagues introduce the Saving MEDICARE ActJul 1, 2026: Elevance Health sues HHS and CMS over star-ratings recalculationJul 16, 2026: UnitedHealth's MA membership is down 965,000 since year-end as it plans 'selective changes in market participation' for 2027Jul 21, 2026: GAO finds gaps in CMS plans for RADV auditsJul 21, 2026: CMS files notice appealing Clover star-ratings rulingJul 28, 2026: 2027 Part D base premium set at $41.33 under the IRA's 6 percent capJul 29, 2026: Humana will drop 2027 plans covering about 600,000 members, 8 percent of its baseAug 27, 2026: Federal judge denies Elevance star-ratings preliminary injunctionAug 28, 2026: CMS defers decision on collecting extrapolated RADV overpaymentsSep 5, 2026: Plan non-renewal letters are due by October 2; open enrollment runs October 15 to December 7Expected Oct 1, 2026: 2027 marketing-rule changes take effectExpected Oct 2, 2026: Deadline for 2027 MA plan non-renewal lettersExpected Oct 15, 2026: Medicare open enrollment opens for 2027 coverageExpected Dec 31, 2026: Discontinued 2027 Medicare Advantage plans end
34 entriesbusiest year 2026 (23)Legal and regulatoryAnnouncements and launchesFinancial and reportskey momentcause, response or contradictionexpected next

Earlier years show only their entries' dates and titles. Click a year heading to show the details.

202623 entries
  1. ReportKey moment

    Plan non-renewal letters are due by October 2; open enrollment runs October 15 to December 7

    With insurers having told investors which 2027 plans will end on December 31, members learn by letter in early October, leaving a window before open enrollment closes on December 7. Those whose plan is terminated get a guaranteed-issue right to buy Medigap if they return to Original Medicare, a protection lost if they simply pick another MA plan.

    • 24/7 Wall St. · Sep 5, 2026 · Insurers spent the summer telling Wall Street exactly which Medicare Advantage plans are disappearing on December 31. Enrolled members get a letter in October, a closing enrollment window in December, and a rare legal protection most will never realize they… This post may contain links from our sponsors and affiliates, and Flywheel Publishing may receive compensation for actions taken through them.
  2. RegulatoryKey moment

    CMS defers decision on collecting extrapolated RADV overpayments

    The Centers for Medicare & Medicaid Services issued payment-year 2024 RADV audit methods guidance. CMS said it had not decided whether it would collect extrapolated overpayments or only errors associated with sampled enrollees.

    • Centers for Medicare & Medicaid Services · Aug 28, 2026 · CMS has not yet decided whether it will collect extrapolated overpayment amounts or only overpayments associated with the sampled enrollees for these audits.

    Editor's note: The document is CMS's Payment Year 2024 Medicare Advantage Contract-Specific RADV Audit Methods and Instructions, published 2026-08-28. It states verbatim that CMS had not yet decided whether to collect extrapolated overpayments or only overpayments associated with sampled enrollees.

  3. Legal

    Federal judge denies Elevance star-ratings preliminary injunction

    The U.S. District Court for the Southern District of Georgia denied Elevance Health's motion for a preliminary injunction over its Medicare Advantage star ratings. The court also denied the government's motion to dismiss the case.

    Editor's note: The order states that the Southern District of Georgia denied both the government's Motion to Dismiss and Elevance's Motion for Preliminary Injunction. It was signed by Judge Lisa G. Wood on 2026-08-27.

  4. FinancialKey moment

    Humana will drop 2027 plans covering about 600,000 members, 8 percent of its base

    On its second-quarter call CFO Celeste Mellet confirmed that Humana's 2027 plan exits would affect roughly 600,000 members, concentrated in the least profitable plans, most rated 3.5 stars or lower for the 2027 bonus year, while the company expected to recapture a share similar to the 40-plus percent it kept after the 2025 exits. Non-renewal letters go out in September and October.

    • Becker's Payer Issues · Jul 29, 2026 · Humana expects Medicare Advantage plan exits next year to affect around 600,000 members as the insurer continues to focus on margin recovery. “We will work to recapture a significant portion of that volume as we did in 2025,” CFO Celeste Mellet said on the company’s July 29 second quarter earnings call.
    • 24/7 Wall St. (via Yahoo Finance) · Aug 15, 2026 · Humana (NYSE: HUM) confirmed the exits on its July 29, 2026 earnings call, and CFO Celeste Mellet was blunt about the scope: "For 2027, we anticipate these plan exits will impact approximately 600,000 members, though we will work to recapture a significant portion of that volume as we did in 2025." salarko / iStock via Getty Images That is about 8% of Humana's 7.2 million MA members.
  5. Regulatory

    2027 Part D base premium set at $41.33 under the IRA's 6 percent cap

    CMS released the 2027 Part D national average bid and base beneficiary premium, $41.33, up from $38.99 in 2026, with the increase held to the Inflation Reduction Act's 6 percent-a-year premium stabilization limit. In the same release CMS said the Part D premium stabilization demonstration that had subsidised standalone drug plans in 2025 and 2026 would end, leaving plans to price the redesigned benefit on their own for 2027.

  6. LegalKey moment

    CMS files notice appealing Clover star-ratings ruling

    CMS filed a notice of appeal to the U.S. Court of Appeals for the Eleventh Circuit against the May ruling that it had exceeded its authority on ten star-ratings measures, according to Clover's 10-Q and a Becker's report citing a July 21 court filing; the appellate docket shows the case opened July 22. CMS had meanwhile recalculated Clover's rating to 4.5 stars and begun recalculating other 2027 quality-bonus ratings.

    Editor's note: Hand-checked: Clover 10-Q and Becker's date the notice July 21; the Eleventh Circuit docket opened July 22.

  7. Report

    GAO finds gaps in CMS plans for RADV audits

    GAO found that CMS corrective-action plans were not sufficiently detailed and did not adequately monitor progress. The report addressed improper-payment and fraud risks in Medicare Advantage.

    Editor's note: The report states that CMS’s corrective action plans were not sufficiently detailed and did not adequately monitor progress, and it specifically discusses RADV audits, improper payments, and Medicare Advantage fraud risks. The letter is dated July 21, 2026.

  8. FinancialKey moment

    UnitedHealth's MA membership is down 965,000 since year-end as it plans 'selective changes in market participation' for 2027

    Second-quarter results showed seniors served through Medicare Advantage had contracted by 965,000 in the first half of 2026, and UnitedHealthcare CEO Tim Noel told analysts the 2027 bids relied on benefit adjustments and selective exits to protect margins. Trade reports later put the 2027 county exits in the dozens across a dozen states.

  9. Legal

    Elevance Health sues HHS and CMS over star-ratings recalculation

    Elevance Health sued the Department of Health and Human Services and the Centers for Medicare & Medicaid Services over the recalculation of Medicare Advantage quality ratings. Elevance Health alleged that the recalculation did not align with the Clover Health ruling and affected $115 million in payments.

    Editor's note: The order states that Elevance and affiliates sued HHS and CMS over the Star Ratings/QBP recalculation following Clover, alleging different treatment and an approximately $115 million increase in 2027 QBP payments under their proposed recalculation. It expressly states that plaintiffs filed the action on July 1, 2026.

  10. Regulatory

    Lloyd Doggett and colleagues introduce the Saving MEDICARE Act

    Representative Lloyd Doggett and 44 colleagues introduced the Saving MEDICARE Act. The bill addresses Medicare Advantage payments, coding, quality bonuses, and RADV audit oversight.

    • Office of Rep. Lloyd Doggett · Jul 1, 2026 · Today, U.S. Representative Lloyd Doggett (D-TX), Ranking Member of the House Ways & Means Health Subcommittee, joined by 44 colleagues, introduced the Saving Medicare Enrollees from Deceptive Insurers and Creating Ample Resources for Everyone (Saving MEDICARE) Act.

    Editor's note: The page states that Rep. Lloyd Doggett, joined by 44 colleagues, introduced the Saving MEDICARE Act on July 1, 2026. It describes provisions concerning Medicare Advantage overpayments, diagnosis coding/upcoding, the Quality Bonus Program, and RADV audit oversight.

  11. RegulatoryKey moment

    CMS begins recalculating certain 2027 quality bonus ratings

    CMS issued guidance that it was voluntarily recalculating 2027 Quality Bonus Payment ratings for certain Medicare Advantage contracts. CMS said the recalculation resulted from the preceding court decision.

    • Clover Health Form 8-K · Jun 18, 2026 · On June 17, 2026, CMS issued updated guidance informing all Medicare Advantage Organizations that it was voluntarily recalculating the 2027 Quality Bonus Payment ratings for certain Medicare Advantage contracts as a result of the preceding decision.

    Editor's note: The filing states that CMS issued updated guidance on June 17, 2026, voluntarily recalculating 2027 Quality Bonus Payment ratings for certain Medicare Advantage contracts because of the preceding decision. The quoted language appears verbatim apart from formatting.

  12. Regulatory

    CMS recalculates Clover rating to 4.5 stars

    CMS informed Clover that it had recalculated Clover's 2026 Star Rating to 4.5 stars. CMS instructed Clover to submit alternate bids using the 4.5-star rating.

    • Clover Health Form 8-K · Jun 10, 2026 · On June 9, 2026, CMS informed Clover that, consistent with the Court’s order, it has recalculated Clover's 2026 Star Rating as 4.5 Stars, and has instructed Clover to submit alternate bids at 4.5 Stars.

    Editor's note: The filing states that on June 9, 2026, CMS informed Clover it had recalculated the 2026 Star Rating to 4.5 Stars and instructed Clover to submit alternate bids at that rating.

  13. Report

    KFF: Medicare Advantage holds 55 percent of eligible beneficiaries, but employer-group enrollment falls for the first time since 2010

    KFF's annual enrollment update put 2026 MA penetration at 55 percent with UnitedHealthcare and Humana still holding almost half the market, but found enrollment growth slowing sharply, employer and union group plans down by about 31,000, and UnitedHealthcare down nearly 647,000 between March 2025 and March 2026 while Humana gained 1.3 million.

    • KFF · Jun 5, 2026 · The 2026 enrollment in group plans is a slight decrease from 2025 (a decrease of about 31,000 enrollees), the first time since 2010 that enrollment in this type of plan has declined year-to-year (Figure 5).
  14. Announcement

    Presbyterian Healthcare Services plans to end most MA plans in 2027

    Presbyterian Healthcare Services decided to stop offering most Presbyterian Health Plan Medicare Advantage plans in 2027. The organization cited financial losses and Medicare Advantage market conditions.

    • Healthcare Finance News · Jun 5, 2026 · Presbyterian Healthcare Services will stop offering most of Presbyterian Health Plan's Medicare Advantage plans in 2027, citing financial losses and broader challenges in the Medicare Advantage market.

    Editor's note: The page states that Presbyterian Healthcare Services will stop offering most Presbyterian Health Plan Medicare Advantage plans in 2027, citing financial losses and broader Medicare Advantage market challenges. The article is dated 2026-06-05, which supports the node's June 2026 date.

  15. Financial

    Elevance Health wires $342.2 million to CMS

    Elevance Health sent a $342.2 million wire payment to the Centers for Medicare & Medicaid Services in connection with a Medicare Advantage risk-adjustment enforcement matter. Court records reported that the wire transfer occurred on May 27.

    • Fierce Healthcare / KFF Health News · Jun 26, 2026 · Elevance Health, which covers about 2 million people on Medicare, sent the money to the Centers for Medicare & Medicaid Services via wire transfer on May 27, court records show.

    Editor's note: The article states that Elevance Health sent a $342,209,085.30 wire payment to CMS and that court records show the transfer occurred on May 27. It characterizes the payment as related to a CMS enforcement action involving Medicare Advantage billing-data compliance and overpayments.

  16. LegalKey moment

    Clover wins a ruling that CMS exceeded its authority on ten star-ratings measures

    A federal district court granted Clover Insurance partial summary judgment, holding that CMS exceeded its statutory authority in calculating ten star measures and skipped notice-and-comment on ten more, the second court in a year to upend the ratings. Humana cited the decision in its pending Fifth Circuit appeal a week later.

    • Groom Law Group · May 28, 2026 · On May 27, 2026, a federal district court granted partial summary judgment for Clover Insurance Company (“Clover”), holding that CMS exceeded its statutory authority in calculating ten Star Ratings measures and separately failed to satisfy notice-and-comment rulemaking requirements for ten other measures.
  17. RegulatoryKey moment

    CMS finalizes 2027 rates at 2.48 percent, over $13 billion, up from the near-zero proposal

    The final 2027 rate announcement raised the net payment update from 0.09 percent to 2.48 percent, about 4.98 percent once expected risk-score growth is counted, mainly by updating the effective growth rate with newer fee-for-service data. Plan stocks rallied, but the update still trailed the 5.06 percent of 2026 and medical-cost trends insurers said were running near 7 percent.

    • Centers for Medicare & Medicaid Services · Apr 6, 2026 · The final policies in the CY 2027 Rate Announcement are projected to result in an increase of 2.48% or over $13 billion in payments to MA plans in CY 2027. When accounting for estimated risk score trend in MA due to factors such as population changes and coding practices, this amounts to a 4.98% increase.
  18. Regulatory

    2027 final rule reshapes star ratings and rolls back 2023 marketing safeguards

    The contract-year 2027 rule dropped the planned health-equity reward in favour of the historical reward factor, removed a set of star measures including call-center tests and added a depression screening measure, codified the Inflation Reduction Act's Part D redesign, and eased marketing rules such as the 48-hour scope-of-appointment wait, effective October 1, 2026. CMS declined to finalise several beneficiary-protection proposals from the Biden era.

    • Centers for Medicare & Medicaid Services · Apr 2, 2026 · First, for the 2027 Star Ratings, CMS is not implementing the Excellent Health Outcomes for All reward (previously called the Health Equity Index reward) that was developed to incentivize improved performance for a subset of enrollees and will continue the historical reward factor that encourages consistently high performance for all enrollees across all quality measures.
  19. Report

    Enrollment data: MA grows only 3 percent to 35.5 million; UnitedHealthcare down 9 percent since October

    A Healthcare Dive analysis of CMS enrollment files showed 35.5 million people in Medicare Advantage in February 2026 versus 34.4 million a year earlier, growth of about 3 percent against a historical pace of up to 10 percent. UnitedHealthcare fell to just under 9.4 million from 10.3 million before open enrollment; Elevance, Centene and CVS lost 14, 4 and 3 percent of members; Humana was the big gainer.

    • Healthcare Dive · Feb 24, 2026 · Almost 35.5 million people were enrolled in the privatized Medicare programs as of February, compared with about 34.4 million people in the same month last year, according to new government data.
  20. Financial

    Humana guides to 25 percent individual MA growth for 2026 as rivals retreat, despite a star-ratings hit

    Humana reported a $796 million fourth-quarter loss but said it had added roughly a million individual MA members during open enrollment, with over 70 percent of new sales switching from competitors, and expected about 25 percent growth for 2026. It guided to lower earnings because of the Bonus Year 2026 star-ratings headwind, with about 45 percent of members in 4-star-plus contracts.

    • Humana Q4 2025 earnings release (SEC 8-K exhibit) · Feb 11, 2026 · Anticipates FY 2026 individual Medicare Advantage membership growth of 'approximately 25 percent' over 2025; driven by new sales and improved retention from the company's customer-led benefit strategy and changes to its customer service approach
  21. Financial

    UnitedHealth expects to shed 1.3 to 1.4 million Medicare Advantage members in 2026

    On its fourth-quarter call UnitedHealthcare CEO Tim Noel said membership losses would exceed the company's plan because an intensely competitive enrollment season drove more plan-shopping than expected; the 2026 approach favoured margin over volume. UnitedHealth's full-year guidance implied MA membership of 7.2 to 7.3 million, down from about 8.4 million.

    • Fierce Healthcare · Jan 27, 2026 · UnitedHealth now expects to lose between 1.3 million and 1.4 million Medicare Advantage members in 2026 across group, individual and dual special needs plans.
  22. RegulatoryKey moment

    2027 advance notice proposes an almost flat 0.09 percent payment update

    CMS proposed a net average increase of just 0.09 percent, about $700 million, for 2027, its smallest in years, citing the star ratings, risk-adjustment trends and the continued phase-in of the 2024 risk model. Insurers and Wall Street read the notice as confirmation that 2027 benefits and footprints would shrink further.

    • Centers for Medicare & Medicaid Services · Jan 26, 2026 · If finalized, the proposed policies are projected to result in a net average year-over-year payment increase of 0.09%, or over $700 million in MA payments to plans in CY 2027.
  23. Legal

    Kaiser Permanente affiliates agree to pay $556 million in FCA settlement

    Kaiser Permanente affiliates agreed to pay $556 million to resolve False Claims Act allegations that they submitted invalid diagnosis codes for Medicare Advantage enrollees to obtain higher payments, one of the largest risk-adjustment settlements to date. Kaiser said the agreement contains no admission of wrongdoing or liability.

    • U.S. Department of Justice · Jan 14, 2026 · Affiliates of Kaiser Permanente, an integrated healthcare consortium headquartered in Oakland, California, have agreed to pay $556 million to resolve allegations that they violated the False Claims Act by submitting invalid diagnosis codes for their Medicare Advantage Plan enrollees in order to receive higher payments from the government.
    • Kaiser Permanente · Jan 14, 2026 · The agreement resolves a False Claims Act lawsuit and has no admission of wrongdoing or liability.

    Editor's note: Hand-checked: DOJ release carries the $556 million figure; Kaiser statement carries the no-admission language.

202511 entries
  1. Legal

    Humana loses its second lawsuit over the 2025 star ratings, a day before open enrollment

    Judge Reed O'Connor ruled that CMS acted lawfully when it downgraded Humana's ratings on the strength of a few failed test calls to its customer service lines, dismissing the case with prejudice. The 2025 downgrade had pushed most of Humana's members out of four-star plans and cost it an estimated billion dollars or more in 2026 bonus revenue; Humana appealed to the Fifth Circuit in late November.

    • Healthcare Dive · Oct 14, 2025 · A federal judge ruled in favor of the CMS on Tuesday, one day before the start of Medicare open enrollment.
    • Healthcare Dive · Dec 1, 2025 · The insurer continues to try to prove that regulators acted arbitrarily in downgrading its quality scores for 2025, despite numerous setbacks in the courts to date.
  2. Report

    2026 star ratings: 40 percent of MA-PD contracts at four stars or better, covering 64 percent of enrollees

    CMS posted the 2026 star ratings on the Plan Finder on October 9, 2025. About 207 MA-PD contracts, 40 percent, earned four or more stars, and the enrollment-weighted average rating edged up to 3.98 from 3.95. The ratings set the 2027 quality bonus payments that feed into the 2027 rate announcement.

  3. Announcement

    UnitedHealthcare confirms full exits from 16 markets, 109 fewer counties, for 2026

    As the 2026 plan files went public, UnitedHealthcare confirmed it would leave Medicare Advantage entirely in 16 markets, affecting about 180,000 members, and offer plans in one fewer state and 109 fewer counties. Humana cut 194 counties and three states, and Aetna about 90 plans across 100 counties; Elevance added counties but left the standalone Part D market.

    • Insurance Business · Oct 2, 2025 · UnitedHealthcare will fully exit Medicare Advantage plans in 16 US markets for the 2026 plan year the company confirmed. The move, which will affect about 180,000 policyholders, has been described as part of a broader Medicare Advantage pullback previously announced, which is expected to impact 600,000 policyholders nationwide.
  4. Report

    CMS projects the first fall in Medicare Advantage enrollment, to 34 million, as 2026 plans are filed

    Previewing the 2026 landscape, CMS said plans' own bids projected enrollment of 34 million, down from 34.9 million and from 50 percent of Medicare to about 48 percent, though the agency expected actual enrollment to hold up better. Average MA premiums were projected to fall from $16.40 to $14.00 a month, with 99 percent of beneficiaries still having access to a plan.

    • Centers for Medicare & Medicaid Services · Sep 26, 2025 · Based on plans’ projections, enrollment in MA is projected to be 34 million in 2026, a decrease from 34.9 million in 2025, with MA enrollment representing approximately 48% of all people enrolled in Medicare, compared to 50% in 2025.
  5. LegalKey moment

    Judge O'Connor vacates the 2023 RADV audit rule that let CMS extrapolate overpayments

    In Humana v. Becerra, the Northern District of Texas granted Humana summary judgment and threw out the 2023 final rule on procedural grounds, finding CMS had changed its justification for dropping the fee-for-service adjuster between proposal and final rule. The decision undercut the extrapolation behind the audit expansion announced in May; CMS appealed to the Fifth Circuit on November 21 and said audits would continue.

    • STAT · Sep 25, 2025 · A federal judge on Thursday vacated a Biden-era rule that would have allowed the government to intensify its audits of private Medicare plans and recoup billions of dollars in overpayments over the next decade. Judge Reed O’Connor of the Northern District of Texas granted health insurer Humana’s motion for summary judgment in its lawsuit challenging a Centers for Medicare and Medicaid Services’ final rule from 2023 that would have increased so-called “risk adjustment data verification,” or RADV, audits of Medicare Advantage plans, which verify that the diagnoses Medicare Advantage plans record for their members are supported in those members’ medical records.
  6. Financial

    Humana's 2025 plan and county exits touch about 560,000 members; it trims the expected loss to 500,000

    Humana said its decision to leave unprofitable plans and counties for 2025 had affected roughly 560,000 members, partly offset by new sales, so it now expected individual Medicare Advantage membership to fall by up to 500,000 for the year rather than about 550,000. The insurer was still absorbing the loss of most of its 4-star-rated membership from the 2025 star ratings.

    • Humana Q2 2025 prepared remarks (SEC 8-K exhibit) · Jul 30, 2025 · We now anticipate a FY 2025 decline of ‘up to 500,000’ individual MA members as compared to our previous expectation of a decline of ‘approximately 550,000’ members oWe now anticipate Consolidated revenues of ‘at least $128 billion’ versus our previous guidance of ‘a range of $126 billion to $128 billion’ supported by better than anticipated individual MA membership and higher than expected payor-agnostic patient growth and script volumes in CenterWell oUpdated FY 2025 Adjusted EPS guidance now contemplates an additional approximately $100 million of incremental investments to improve member and patient outcomes and support operational excellence, positioning the company for long-term success Additional investments focused on initiatives that have shown strong returns YTD
  7. Financial

    UnitedHealthcare will exit plans serving more than 600,000 Medicare Advantage members in 2026

    Reporting second-quarter results under returning CEO Stephen Hemsley, UnitedHealth said outpatient medical costs were running well above expectations and that its insurance arm would leave plans covering over 600,000 people for 2026, mostly PPOs, and might also shrink its Affordable Care Act footprint. UnitedHealthcare CEO Tim Noel said the company would prioritise margin over membership.

    • Healthcare Finance News · Jul 30, 2025 · Without giving details of which markets would be affected, UnitedHealthcare CEO Tim Noel said, “Additionally, and unfortunately, given these pressures, we have made the difficult decision to exit plans that currently serve over 600,000 members, primarily in less managed products such as PPO offerings.” The company is taking similar approaches for its Medicare supplement, Group Medicare Advantage and stand-alone Part D pricing for next year, Noel said.
  8. Legal

    UnitedHealth confirms criminal and civil Justice Department investigations into its Medicare business

    After months of press reports, UnitedHealth Group disclosed in an 8-K that it had approached the Department of Justice and was complying with formal criminal and civil requests about its participation in Medicare, while insisting its practices were among the most accurate in the industry. The probe centred on risk-adjustment coding in Medicare Advantage; the company also launched a third-party review of its policies.

    • UnitedHealth Group Form 8-K (SEC) · Jul 24, 2025 · UnitedHealth Group (the “Company”) proactively reached out to the Department of Justice after reviewing media reports about investigations into certain aspects of the Company’s participation in the Medicare program. The Company has now begun complying with formal criminal and civil requests from the Department.
  9. Announcement

    Insurers pledge to Kennedy and Oz to cut prior authorization by 2026 and standardize it by 2027

    At an HHS roundtable, Aetna, Humana, UnitedHealthcare, Elevance, Centene, Cigna, Kaiser Permanente, the Blues and AHIP committed to six voluntary reforms across Medicare Advantage, Medicaid managed care and commercial plans: fewer services subject to prior authorization in 2026, real-time electronic approvals and honouring other insurers' decisions by 2027. A year later, KFF Health News found insurers hedging on the promises.

    • Centers for Medicare & Medicaid Services · Jun 23, 2025 · In a roundtable discussion hosted by HHS, health insurers pledged six key reforms aimed at cutting red tape, accelerating care decisions, and enhancing transparency for patients and providers.
  10. RegulatoryKey moment

    CMS says it will audit every Medicare Advantage contract every year and clear the 2018 to 2024 backlog

    Administrator Mehmet Oz announced that Risk Adjustment Data Validation audits would cover all roughly 550 MA contracts annually instead of about 60, with coders expanded from 40 to about 2,000 and the backlog of payment years 2018 to 2024 to be completed by early 2026. CMS cited estimates of up to $17 billion a year in overpayments from unsupported diagnoses.

    • Centers for Medicare & Medicaid Services · May 21, 2025 · Today, the Centers for Medicare & Medicaid Services (CMS) announced a significant expansion of its auditing efforts for Medicare Advantage (MA) plans. Beginning immediately, CMS will audit all eligible MA contracts for each payment year in all newly initiated audits and invest additional resources to expedite the completion of audits for payment years 2018 through 2024.
  11. RegulatoryKey moment

    CMS finalizes 2026 Medicare Advantage rates: a 5.06 percent increase, about $25 billion more for plans

    Two months into the Trump administration, CMS finalized the 2026 rate announcement with a net payment increase of 5.06 percent, more than double the 2.23 percent the Biden administration had proposed in January, largely by using more recent claims data. It followed the April 4 final rule that dropped Biden-era proposals such as covering anti-obesity drugs.

    • Centers for Medicare & Medicaid Services · Apr 7, 2025 · Today, the Centers for Medicare & Medicaid Services (CMS) released the Calendar Year (CY) 2026 Rate Announcement for the Medicare Advantage (MA) and Medicare Part D Prescription Drug Programs that finalizes the payment policies for these programs.
  1. Oct 14, 2025Humana loses its second lawsuit over the 2025 star ratings, a day before open enrollment
  2. Oct 9, 20252026 star ratings: 40 percent of MA-PD contracts at four stars or better, covering 64 percent of enrollees
  3. Oct 2, 2025UnitedHealthcare confirms full exits from 16 markets, 109 fewer counties, for 2026
  4. Sep 26, 2025CMS projects the first fall in Medicare Advantage enrollment, to 34 million, as 2026 plans are filed
  5. Sep 25, 2025Judge O'Connor vacates the 2023 RADV audit rule that let CMS extrapolate overpayments
  6. Jul 30, 2025Humana's 2025 plan and county exits touch about 560,000 members; it trims the expected loss to 500,000
  7. Jul 29, 2025UnitedHealthcare will exit plans serving more than 600,000 Medicare Advantage members in 2026
  8. Jul 24, 2025UnitedHealth confirms criminal and civil Justice Department investigations into its Medicare business
  9. Jun 23, 2025Insurers pledge to Kennedy and Oz to cut prior authorization by 2026 and standardize it by 2027
  10. May 21, 2025CMS says it will audit every Medicare Advantage contract every year and clear the 2018 to 2024 backlog
  11. Apr 7, 2025CMS finalizes 2026 Medicare Advantage rates: a 5.06 percent increase, about $25 billion more for plans

Cause and effect

  1. Clover wins a ruling that CMS exceeded its authority on ten star-ratings measureswas answered by →CMS files notice appealing Clover star-ratings rulingCMS's notice of appeal challenged the district court decision in the Stars Litigation.
  2. CMS begins recalculating certain 2027 quality bonus ratingswas answered by →Elevance Health sues HHS and CMS over star-ratings recalculationElevance Health's July 1 lawsuit challenged CMS's post-Clover recalculation of quality-bonus-payment ratings.

Where sources disagree or fall silent

  • CMS has deferred deciding whether payment-year 2024 RADV audits will recover extrapolated overpayments or only sampled-enrollee errors after the Humana ruling vacated the extrapolation rule.
  • The ultimate outcome of CMS’s Fifth Circuit appeal in the Humana RADV case is unresolved, as is the practical effect on the broader audit expansion and backlog-clearance plan.
  • CMS has appealed Clover’s star-ratings ruling to the Eleventh Circuit; it remains unclear which recalculated quality-bonus ratings will stand and how much payment exposure plans face.
  • Elevance’s request for a preliminary injunction was denied, but its challenge to CMS’s star-ratings recalculation remains pending on the merits.
  • The full scale of 2027 benefit reductions, county exits, and resulting enrollment shifts will not be known until plan choices are available and beneficiaries complete open enrollment.
  • CMS’s September 2025 plan-bid projection anticipated 34 million MA enrollees in 2026, while subsequent enrollment reports found 35.5 million enrollees and KFF estimated 55% penetration; the differing projections and measurement dates show the difficulty of assessing the extent of any enrollment retreat.

What to watch next

  • Oct 1, 20262027 marketing-rule changes take effect CMS’s rollback of the 48-hour scope-of-appointment waiting period becomes effective, changing how plans and agents may market ahead of and during enrollment.
  • Oct 2, 2026Deadline for 2027 MA plan non-renewal letters Members in discontinued plans should receive notice of their options before open enrollment, including possible Medigap guaranteed-issue rights if they return to Original Medicare.
  • Oct 15, 2026Medicare open enrollment opens for 2027 coverage Beneficiaries can change MA or Part D coverage as insurer exits, benefit revisions, premiums, and ratings become available; the period runs through December 7.
  • Dec 31, 2026Discontinued 2027 Medicare Advantage plans end UnitedHealthcare, Humana, Presbyterian, and other insurers’ non-renewed plans are set to end, making members’ enrollment choices consequential.

Who is involved

  • Sets Medicare Advantage and Part D payment, marketing, audit, star-rating, and enrollment policies.

  • Humanacompany

    A major MA insurer that gained enrollment in 2026 but plans 2027 exits affecting roughly 600,000 members and continues to contest ratings policy.

  • The largest Medicare Advantage insurer, which exited markets for 2026 and plans further selective 2027 changes after major membership losses.

  • Mehmet Ozperson

    As CMS administrator, announced annual RADV audits of all roughly 550 MA contracts and completion of the audit backlog.

  • Paid CMS $342.2 million in a risk-adjustment enforcement matter and is suing over CMS’s post-Clover star-ratings recalculation.

  • Medicare Advantage insurer that won a May 2026 ruling that CMS exceeded its authority on ten star-ratings measures, prompting recalculations and an Eleventh Circuit appeal.

  • Parent of UnitedHealthcare; disclosed Justice Department Medicare investigations and is reducing Medicare Advantage membership and selected 2027 market participation.

  • Aetnacompany

    Committed to voluntary prior-authorization reforms and cut about 90 plans across 100 counties for 2026.

17 more
  • Defendant in Clover Insurance Company's star-ratings litigation.

  • Tim Noelperson

    Said UnitedHealthcare would prioritise margin over membership and that its 2027 bids relied on benefit adjustments and selective exits.

  • Celeste Melletperson

    Confirmed that Humana's 2027 plan exits would affect roughly 600,000 members.

  • Reed O'Connorperson

    Ruled for Humana in the RADV case and later ruled that CMS lawfully downgraded Humana's star ratings.

  • Investigates Medicare risk-adjustment practices and settled coding-related False Claims Act allegations with Kaiser affiliates.

  • AHIPcompany

    Committed with insurers to six voluntary prior-authorization reforms at an HHS roundtable.

  • Centenecompany

    A Medicare Advantage insurer whose enrollment declined in early 2026 and which joined the prior-authorization pledge.

  • Kaiser Permanentecompany

    Its affiliates paid $556 million to settle False Claims Act allegations involving Medicare Advantage diagnosis coding, without admitting liability.

  • KFFcompany

    Published an annual enrollment update finding 55 percent Medicare Advantage penetration and sharply slowing enrollment growth.

  • Lloyd Doggettperson

    Member of Congress who introduced the Saving MEDICARE Act addressing MA payments, coding, quality bonuses, and RADV oversight.

  • Presbyterian Healthcare Servicescompany

    Plans to end most of its Medicare Advantage offerings in 2027, citing losses and market conditions.

  • RADV auditsother

    Risk Adjustment Data Validation audits, which check whether diagnoses submitted by MA plans are supported by medical records; expanded to every contract in 2025 and contested in court.

  • Robert F. Kennedy Jr.person

    Insurers pledged voluntary prior-authorization reforms to Kennedy and Oz at an HHS roundtable.

  • U.S. Court of Appeals for the Eleventh Circuitother

    Court where CMS filed its notice of appeal.

  • U.S. District Court for the Northern District of Texasregulator

    Granted Humana summary judgment and vacated the 2023 RADV audit rule on procedural grounds.

  • U.S. District Court for the Southern District of Georgiaregulator

    Denied Elevance Health's preliminary-injunction motion and the government's dismissal motion.

  • Reported deficiencies in CMS corrective-action plans for Medicare Advantage program integrity.

Changelog

Changes to this timeline. All timelines' changes.

  • Summary, key players and catalysts refreshed.
  • Added 11 node(s): 2026-01-14 Kaiser Permanente affiliates agree to pay $556 million in FCA settlement; 2026-05-27 Elevance Health wires $342.2 million to CMS; 2026-06 Presbyterian Healthcare Services plans to end most MA plans in 2027; 2026-06-09 CMS recalculates Clover rating to 4.5 stars and 7 more.
  • Research run found 12 candidate node(s).
  • Research run found 8 candidate node(s).
  • Seeded 23 hand-verified node(s) from medicare-advantage-2027.yaml.

A research pass records each dated fact with the page it came from and a verbatim quote. A second, independent pass re-opens every cited page and rejects entries it cannot confirm. The editor reviews what remains before it is published, and every change is listed above. Full method.