CMS's own filing for Massachusetts
Medicare Advantage plans in Massachusetts, by the numbers
What CMS published about Medicare enrollment in Massachusetts: 5 of 5 measures filed for this state, each one a field of the state's own row with the date the file was read.
- figures published by CMS
- 5
- counts CMS withheld
- 0
- the day this file was read
- 2026-09-11
Where Massachusetts sits among the states
35.9% of everyone with Medicare in Massachusetts is in a Medicare Advantage or other health plan rather than Original Medicare. That puts Massachusetts 40th of 51, between South Dakota above it and North Dakota below. Across the country the same figure runs from 62.8% in Michigan down to 3.0% in Alaska, so what counts as the ordinary choice depends on where a person lives, and this is what it is where they do.
Every measure CMS filed for Massachusetts
| Measure | What CMS published | Source |
|---|---|---|
| People with Medicare | In 2025, 1,491,093 people were enrolled in Medicare in Massachusetts. | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
| In Medicare Advantage and other health plans | In 2025, 535,328 of them were in Medicare Advantage or another health plan rather than Original Medicare in Massachusetts (35.9% of everyone with Medicare in Massachusetts). | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
| In Original Medicare | In 2025, 955,765 stayed in Original Medicare in Massachusetts (64.1% of everyone with Medicare in Massachusetts). | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
| In a stand-alone Part D drug plan | In 2025, 724,868 bought drug coverage as a stand-alone Part D plan in Massachusetts (48.6% of everyone with Medicare in Massachusetts). | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
| Also covered by Medicaid | In 2025, 370,733 were covered by Medicaid as well as Medicare in Massachusetts (24.9% of everyone with Medicare in Massachusetts). | CMS Medicare Monthly Enrollment, 2025 read September 2026 |
A withheld figure means CMS did not publish the count, never that the count is zero.
Cite or embed this figure
Massachusetts: 5 Medicare enrollment figures published by CMS and 0 counts withheld (Medicare Plan Comparison State Enrollment Index).
Cite as: "Medicare Plan Comparison State Enrollment Index: Massachusetts", updated 2026-09-11, https://medicareplancomparison.com/states/massachusetts/.
Download the Massachusetts figures (CSV), free to reuse with citation.