How is Medicare Advantage developing in Massachusetts?
Massachusetts's MA-and-other health plan share is 35.8% — below the 51.1% national share by 15.3 points, ranking 40 of 53 with 540,917 people in a Medicare Advantage or other Medicare health plan out of 1,511,434 Medicare beneficiaries, on the CMS state record for April 2026.
Share and enrollee counts are the CMS state record for April 2026 (Medicare Monthly Enrollment). Summing this state’s 14 county rows gives 35.8% on 1,509,191 beneficiaries, a difference of 2,243 beneficiaries CMS does not assign to a county. Both figures are published; the state record is canonical for the state. Dual counts are county-file aggregates.
County detail
All 14 Massachusetts counties are in the county explorer, with April 2026 MA & other health plan share, 12-month momentum and market size from the CMS Medicare Monthly Enrollment county file. Dedicated county pages are published for the highest-signal markets first; Massachusetts does not have one yet. How the county file is used.
Sales playbook one-pager
The Massachusetts state sales playbook PNG has been withdrawn. It was rendered from the February 2026 enrollment file and carried a Growth Runway class, both retired by the 2026-08-24 data audit. Use the county explorer for April 2026 health plan share, momentum and market size, and the carrier battlecards for competitive facts. Read the audit.
So what / Now what Interpretation
Massachusetts is a switcher market — expansion means winning members from incumbent MA plans on benefits, network, and brand.
- Compare against neighboring states on the national table.
- Check 2026 plan exits for orphaned membership contestable in this market.
- Sales teams: rank this market on health-plan share headroom and momentum in the county explorer, and see which competitive facts apply on the carrier battlecards.
Provenance — MA enrollment & penetration by state
- Source file
- Medicare Monthly Enrollment (CCW-derived national, state and county beneficiary counts; data.cms.gov dataset
d7fabe1e-d19b-4333-9eff-e80e0643f2fd, public API) - Vintage
- April 2026
- Last updated
- July 31, 2026
- Refresh cadence
- Monthly (CMS publishes ~3 months in arrears)
- Method
- State-level rows pulled from the Medicare Monthly Enrollment API; MA share = MA_AND_OTH_BENES / TOT_BENES. Refreshed via automated pipeline from the CMS public API.
- Known limitations
- Health plan share here is measured against all Medicare beneficiaries (Parts A and/or B), not the KFF eligible-only basis, which runs ~4pts higher.