Four weeks before AEP, the federal watchdog put $178 million of upcoding findings on Humana and UnitedHealthcare, Walmart re-entered Medicare Advantage through SCAN, and the provider side of the network kept walking away.
National headlines
1. OIG puts $178 million of upcoding findings on Humana and UnitedHealthcare contracts
What happened: HHS OIG audit reports released September 15 estimate $130.9 million in overpayments to a HumanaChoice PPO contract (about 1.7 million enrollees) and $46.9 million to UnitedHealthcare of Wisconsin (about 676,000 enrollees) for 2020-2021. The audits targeted high-risk diagnosis codes; 178 of 220 sampled Humana enrollee-years and 183 of 250 UnitedHealthcare enrollee-years lacked medical record support. Resolved conditions such as stroke, cancer and heart attack were frequently coded as active. Both insurers rejected the methodology.
Why it matters: The recommendations are non-binding and CMS decides on recoupment, so the direct dollars are not the story. The pattern is: contract-level, named-carrier audit findings are now routine, and they land during the weeks when brokers, providers and press are forming their AEP narrative about which carriers are stable.
Strategic implication: Treat acute-condition coding (stroke, heart attack, cancer history) as the first place auditors look, and confirm your own documentation support rates on those codes before any extrapolation exposure is assessed. On the competitive side, expect audit headlines to be used against the named carriers in broker and provider conversations this fall.
Healthcare Dive reported the same audits on September 17 with rounded figures ($131 million and $47 million).
On this site: Policy impact · Competitor vulnerability
2. Walmart returns to Medicare Advantage with a co-branded SCAN plan
What happened: Walmart and SCAN Health Plan announced a co-branded Medicare Advantage plan expected to be available to more than two million Medicare enrollees in two states. It will be sold through Walmart stores, Walmart's licensed insurance agency and online. Benefits may include pharmacy, vision, food and over-the-counter support, pending regulatory approval, plus a nutrition and wellness tool that uses shopping data for members who opt in. Walmart's previous Medicare Advantage partnerships, with Clover Health from 2020 and UnitedHealth in Georgia from 2023, both ended.
Why it matters: SCAN has now signed two national retailers in about a month, Costco in August and Walmart in September. That is a deliberate distribution strategy from a regional nonprofit plan: acquire through a trusted retail relationship instead of competing for commissioned broker attention that national carriers are already cutting.
Strategic implication: Retail co-branding shifts the local comparison point toward grocery, OTC and pharmacy benefits. If you compete in SCAN's expansion markets, test your supplemental benefit design against a retail-anchored offer rather than SCAN's existing book. The prior Walmart ventures are also a reminder that retail footfall has not, by itself, sustained Medicare Advantage enrollment.
The announcement coverage reviewed did not give a firm effective plan year; treat launch timing as unconfirmed.
On this site: Compare markets · Marketing intelligence
3. Hospitals keep leaving Medicare Advantage networks, and the exits are compounding
What happened: About 90 hospitals and health systems have terminated some or all Medicare Advantage contracts over three years, at least 30 in 2026 alone, including Mayo Clinic, UNC Health and Avera Health. Systems cite denial rates, prior-authorization volume and payment levels. The same analysis contrasts Henry Ford Health, whose own Medicare Advantage enrollment grew 45.8% year over year to 132,566. Separately on September 14, a federal judge sent Ballad Health's claims against UnitedHealth to arbitration; Ballad has said it will end its UnitedHealth Medicare Advantage contract on June 30, 2027.
Why it matters: Provider terminations and carrier exits are now happening in the same markets at the same time. A network that loses an anchor system mid-cycle changes member experience, access measures and, eventually, star performance, and it gives competitors a concrete switching message at AEP.
Strategic implication: Track contract termination notices as a market signal alongside plan exits. Where a competitor loses an anchor system, the members who value that system are a reachable segment; where you are at risk of losing one, the retention plan needs to be in place before the Medicare Advantage Open Enrollment Period in January.
On this site: Carrier footprint · 2027 disruption pipeline
4. Aetna moves to own Arizona's Mercy Care outright, a 404,000-member Medicaid and D-SNP plan
What happened: Ascension is selling its ownership stake in Mercy Care to Aetna, pending regulatory approval; terms were not disclosed. Mercy Care serves about 404,000 members across Medicaid and dual-eligible plans in Arizona and reported $34 million in net income for the prior year. Aetna has run the plan's day-to-day operations since 2002.
Why it matters: Integrated Medicaid and D-SNP platforms are one of the few Medicare-adjacent assets that carriers are consolidating rather than shedding this cycle. Owning the Medicaid contract and the D-SNP together is what makes aligned enrollment possible as integration requirements tighten.
Strategic implication: In states with integrated or aligned D-SNP models, the competitive position is set by who holds the Medicaid contract. D-SNP growth teams should map where their Medicaid partner relationships are exposed to ownership change and where a competitor now controls both sides.
On this site: SNP market view · D-SNP deployment
5. NCQA ratings: more Medicare Advantage plans at the top, but the category average slipped
What happened: NCQA released its 2026 health plan ratings on September 15. Five Medicare Advantage plans earned 5 stars, up from three in 2025: Hometown Health (Nevada), three Kaiser Permanente regions and Network Health (Wisconsin), with 15 more at 4.5 stars. Across all lines, 18 plans reached 5 stars, all of them nonprofits. The overall average rose slightly on commercial and Medicaid gains, while Medicare Advantage ratings declined.
Why it matters: NCQA ratings are not CMS Star Ratings, but they draw on overlapping HEDIS measures, and the top of the list is dominated by integrated, nonprofit plans. That is the same profile that has proven resilient as for-profit national carriers retrench.
Strategic implication: Use the NCQA list as an early read on which regional competitors carry quality credibility into AEP marketing. For Stars teams, a declining Medicare Advantage average alongside harder 2027 CMS cutpoints (covered in the September 7-13 brief) means relative position matters more than absolute improvement.
The cross-line findings (18 plans at 5 stars, Medicare Advantage average declining) are from Healthcare Dive's September 16 coverage of the same release: https://www.healthcaredive.com/news/ncqa-plan-ratings-2026-nonprofits-outperform/830521/
On this site: Star movement
6. OIG flags out-of-network equipment suppliers as a Medicare Advantage fraud gap
What happened: An OIG report on six Medicare Advantage organizations covering about 21,000 durable medical equipment suppliers found nearly 8,000 operating out of network. Out-of-network orthotics suppliers billed about $1,399 per month on average versus $210 for Medicare-enrolled suppliers, and two organizations said out-of-network suppliers accounted for nearly all documented fraud schemes. OIG recommended stronger plan monitoring, more regular use of the CMS preclusion list, and requiring suppliers that bill Medicare Advantage to be Medicare-enrolled. CMS concurred or agreed to consider the recommendations.
Why it matters: Program-integrity findings are shifting from coding toward payment controls that plans themselves operate. A requirement that suppliers be Medicare-enrolled would change out-of-network payment rules for every plan, not only those audited.
Strategic implication: Payment integrity and network teams should review out-of-network DME spend now, particularly orthotics, and confirm preclusion-list screening is routine rather than reactive. It is a cost lever as well as a compliance one.
On this site: Regulatory library
Compiled September 28, 2026. Covers material national developments from September 14-20, 2026, with clearly labeled exceptions where background is needed to read a development inside the window.
Provided for general informational and educational purposes only. It is not legal, financial, insurance or regulatory advice and should not be relied on as such; consult qualified professionals before acting on anything here. © 2026 medicareinsights.org.