CMS released the 2027 Medicare Advantage crosswalk file: 3.15 million lose their plan, 2.12 million are moved to another plan.

Vlada

2026-10-05 · on LinkedIn ↗

CMS released the 2027 Medicare Advantage crosswalk file: 3.15 million lose their plan, 2.12 million are moved to another plan.

CMS released the 2027 Medicare Advantage crosswalk file. 3.15 million people lose their plan. 2.12 million are moved to another plan.

Last week we showed you that 5.27 million people are in a plan that will not be offered in their county in 2027. Some would be moved into another plan. The rest would have to pick a new one. CMS would say which in October. This is that file.

3.15 million losing their plan is 10.6% of everyone in an individual Medicare Advantage plan, and more people than in any year back to 2009. These are individual plans. Employer group retiree plans are not in these numbers.

Who loses depends on the kind of plan. On a regular PPO, 83% of the people whose plan was leaving lose it. That is 1 in 5 of all PPO members. On a regular HMO it is 65%. On a dual HMO plan, for people with Medicare and Medicaid, insurers moved 85% of them.

If you or a parent is one of the 3.15 million, your plan should already have sent you a letter. Losing your plan does not mean losing Medicare. You choose a new plan in open enrollment, October 15 to December 7.

In September we estimated about 3 million. The full table is below, and every plan, county and insurer is in our MCP: vladahealth.com/data-access

You did not choose whether your plan was moved or dropped. Your plan type chose it for you.

Source
CMS Plan Crosswalk 2027 (plan-crosswalk-2027.zip, posted 2026-10-05, sha256 55a392af...1329), CMS Medicare Advantage Landscape CY2026 and CY2027, CMS Monthly Enrollment by Contract/Plan/State/County September 2026; served medicare_semantic.fact_landscape_disposition_v1 (0 differences against docs/knowledge/ma/landscape-day/2026-2027/landscape-analysis-2026-2027-*.csv, Decipher #3143); 2009-2026 series docs/knowledge/ma/landscape-day/2026-2027/EXITS-HISTORY.md.
Measure
September 2026 CMS enrollment, individual MA plans (H/R contracts, plans 001-799, excl. Cost and MMP), matched to the CMS 2026 and 2027 Landscape files by contract, plan, state and county (the Day-One base: 29.86M members, 5.27M in a plan not offered in their county in 2027). Of those, moved = CMS's 2027 crosswalk moves them into a plan offered in their county (renewal under a new id, consolidation, or split); lose their plan = terminated, or the plan stopped serving their county and no successor is offered there. Product types are the fixed buckets: HMO and PPO = non-SNP; D-SNP HMO and D-SNP PPO separately.