Every year, people wait until November or even early December to pick their Medicare Advantage plan for the following year. For 2027, that habit could cost you your first-choice plan.
What’s Actually Changing
CMS released its Contract Year 2027 Enrollment and Disenrollment Guidance on August 25, 2026, and it formalizes how Medicare Advantage plans handle enrollment once they hit capacity. This isn’t a brand-new rule out of nowhere — the authority for plans to cap enrollment has existed for years — but CMS’s 2027 guidance spells out the operational details more clearly than before, and market conditions are pushing more carriers to actually use it.
Why 2027 specifically? A few pressures are converging at once: modest payment increases from CMS, changes to risk-adjustment calculations, and several major carriers (including Humana, UnitedHealthcare, Centene, and Molina) scaling back or exiting markets, displacing over a million members who now need a new plan. Put plainly: more people will be shopping for a smaller pool of $0-premium and high-quality plans, which makes those popular plans far more likely to fill up.
How Medicare Advantage Enrollment Caps Work
A plan can’t just decide mid-season to stop taking new members. Capacity limits have to be requested and approved during the plan’s annual bid submission to CMS, with written justification. Once that cap is approved, here’s the mechanical part that matters most for timing: enrollment requests are processed strictly in the order they’re received. When the cap is hit, the plan closes to new enrollment — full stop, no exceptions for any particular agent, applicant, or health status.
According to Gordon Marketing’s summary of the CMS guidance, plans that reach capacity generally have to pick one of two approaches and apply it consistently: deny all further requests outright (CMS has added specific denial reason codes for this), or, in certain enrollment-period situations, maintain a formal waiting list — admitting people in the exact order their applications came in, with a required written notice to the applicant within 10 calendar days explaining the plan is at capacity and when it expects to reopen. If a plan has been closed to the general public for more than 30 days when a slot finally opens, it’s required to re-contact the person on the waiting list to confirm they still want to enroll before processing it automatically.
We haven’t been able to independently verify every one of those specific timeframes against the full text of CMS’s guidance documents, but the core mechanism — bid-approved caps, strict chronological processing, and closure without warning once the limit is hit — is well documented and consistent across multiple industry sources.
What This Means for You
There’s no “almost full” warning system. A popular plan — especially one many people are moving to because their old plan was discontinued — could fill within days of the Annual Enrollment Period opening on October 15. Plan details become public October 1, which gives you a two-week window to review your options before applications can even be submitted. Waiting until November, historically a common approach, carries more risk this year than in the past.
If your current plan is being discontinued, or if you’re planning to switch because of network changes or a premium increase, this is the year to have that conversation early rather than late.
How Burke Insurance Group Can Help
We track plan availability in your area and can help you understand which plans might be at higher risk of filling up, based on how they’re positioned for 2027. A free consultation costs you nothing, and getting an early start this AEP matters more than it has in past years.
“We do not offer every plan available in your area. Any information we provide is limited to those plans we do offer in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options.”
