The 2027 retrenchment map hardened in a single week: five carriers named as stepping back, a 64,000-member plan wound down entirely, and Aetna made more plans non-commissionable 30 days before AEP opens.
National headlines
1. Five carriers named as stepping back from Medicare Advantage for 2027
What happened: A single industry roundup put five 2027 pullbacks side by side: Providence Health Plan winding down, Humana exiting plans covering roughly 600,000 members, Clear Spring Health already gone as of June 1, Molina discontinuing its MA Part D product to refocus on dual-eligible coverage, and Presbyterian Health Plan ending most Medicare Advantage plans, affecting about 30,000 members.
Why it matters: Displacement is not a national average, it is a county list. The same roundup notes CMS finalized a 2.48% average payment increase for 2027 and cites a JAMA finding that 10% of Medicare Advantage enrollees had to change plans heading into 2026. A second consecutive year of forced switching changes shopping behavior, broker economics and retention math in the affected markets.
Strategic implication: Build the displaced-member map before October: overlay the exiting plans onto your county footprint, size the addressable block, and decide where you are defending versus harvesting. Members displaced at AEP also get the Medicare Advantage Open Enrollment Period from January 1 to March 31, so a market you lose in October is not settled until spring.
Humana's 600,000-member figure was disclosed earlier in August with second-quarter results; it is included here as the roundup's context, not as a new announcement.
On this site: Size the affected counties · AEP target markets
2. Providence Health Plan exits insurance entirely, putting 64,000 MA members in play
What happened: Providence Health Plan will shut down completely after a deal with an unnamed national insurer to preserve its Medicare Advantage business fell through. More than 64,000 Medicare Advantage members are affected. The plan had already announced a wind-down of commercial and Medicaid lines for 2027, and the insurance division lost more than $100 million in 2025 on roughly 440,000 covered lives across western states.
Why it matters: This is the clearest case this week of a provider-sponsored plan failing on the same economics that are driving national carriers to trim: the CEO cited regulatory overhead, medical cost trend and competition from national carriers. Provider-sponsored plans are disproportionately the last local option in their markets, so their exits concentrate displacement rather than spreading it.
Strategic implication: Two moves. First, treat the 64,000 as a contestable block with a known service area and a known provider network, which is unusually clean targeting. Second, if you operate a provider-sponsored or regional plan, the failed-sale outcome matters more than the closure: buyers for subscale MA books are getting harder to find, which shortens the runway on a turnaround decision.
On this site: Carrier & plan intelligence
3. Aetna makes more Medicare Advantage plans non-commissionable, effective September 15
What happened: Aetna will change certain Medicare Advantage plans to non-commissionable on September 15, 2026, with additional plans following on January 1, 2027. Its standalone prescription drug plan has been non-commissionable since 2025. The company described the move as a routine review of distribution strategy.
Why it matters: A commission cut is an exit that does not require a filing. The plan stays on the street, keeps its members and its star contract, and simply stops being sold. The timing matters: September 15 is roughly 30 days before AEP opens, which is when field capacity, call-center scripting and FMO priorities are locked for the season. UnitedHealthcare, Elevance, Cigna and Blue Shield of California have made comparable cuts across the 2025 and 2026 cycles, with PPO products cut most often.
Strategic implication: Model your AEP forecast on which competing products a broker can still get paid on, not on which products exist. Where a large competitor goes non-commissionable, the independent channel reallocates within days, and the plans that keep paying absorb volume they did not forecast. That is an opportunity on the growth side and a risk on the risk-mix side, because uncontrolled broker-driven volume rarely arrives with the morbidity profile you priced.
On this site: Sales intelligence
4. CMS tightens prior-authorization transparency reporting; AMA calls it a partial step
What happened: Updated CMS guidance sets out how plans report prior-authorization metrics: publicly posting which items and services require prior authorization, publishing turnaround and outcome metrics on public-facing websites rather than password-protected portals, and disclosing decision timelines against the three-day urgent and seven-day standard expectations. The AMA welcomed the guidance and pressed CMS to define prior authorization more broadly, surface the information at enrollment, and standardize the reporting format.
Why it matters: Prior authorization has been the industry's most exposed operational metric for two years. Moving the numbers to a public site converts an internal service level into a comparable, quotable statistic, which shows up in broker conversations, provider negotiations and press coverage well before it shows up in a star measure.
Strategic implication: Two workstreams, not one. Compliance owns the publication mechanics and the accuracy of what gets posted. Strategy should model where your published numbers land against the competitors in your counties, because that comparison is now free for anyone to make.
On this site: Policy impact
5. Costco enters Medicare with SCAN, and SCAN expands while national carriers retrench
What happened: Costco and SCAN Health Plan announced a co-branded Medicare offering on August 18: Medicare Advantage plans in two states and a Medicare supplement product in a third, sold through Costco stores, online and agents, with a refreshed pharmacy experience plus OTC, vision and audiology benefits. The selected markets cover roughly 5 million Medicare enrollees. Federal rules mean the plans cannot bundle a Costco membership. Two days later, SCAN framed its 2027 posture as a deliberate counter-cycle expansion while larger carriers pull back.
Why it matters: Retail and affinity distribution is the structural answer to commission compression: it moves acquisition cost from a per-sale commission to a channel relationship, and it reaches shoppers who never call a broker. It also lands in the same week that a major carrier cut commissions, which is the contrast worth noticing.
Strategic implication: Watch the two states at bid time rather than at launch. A retail-branded entrant changes the shopping funnel in a market more than it changes share in year one, and the benefit design it anchors on becomes the local comparison point. If you compete in SCAN's footprint, price and benefit-test against the co-branded product, not against SCAN's current book.
On this site: Compare markets
6. Network access becomes the quiet 2027 risk
What happened: Mount Sinai Health System stopped accepting some new patients covered by government-backed plans, including Medicare Advantage products from Fidelis Care and Wellcare, several Medicaid plans and exchange coverage, under a policy effective August 1. The notices were removed from its website after media inquiry. An insurer issued a cease-and-desist over a related new-patient policy the following day.
Why it matters: Access restrictions of this kind rarely arrive as a contract termination. They arrive as a quiet change to who is accepted as a new patient, which does not trigger a network-adequacy filing but does change what a member actually experiences, and therefore what shows up in access and satisfaction measures a year later.
Strategic implication: Add new-patient acceptance to network monitoring, separate from participation status. In markets absorbing displaced members, a network that is adequate on paper and closed in practice is the fastest way to convert an AEP win into a first-year disenrollment.
Activity date is the policy effective date; the reporting date is August 19.
Compiled August 26, 2026. Covers material national developments from August 17-23, 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.