CMS Medicare enrollment · June 2026
Massachusetts Medicare Enrollment
State and county enrollment from CMS, including Original Medicare, Medicare Advantage and Other Health Plans, and Part D coverage.
Informational only. These enrollment counts do not compare plans or provide medical, financial, or enrollment advice.
Massachusetts enrollment figures
- Total Medicare enrollment
- 1.5M
- Original Medicare
- 975.3K
- MA & Other share
- 35.7%
- Part D coverage
- 83.4%
1,516,549
975,290 beneficiaries
CMS combined delivery-system measure
1,264,412 beneficiaries
County enrollment
15 CMS county rows for Massachusetts. Unavailable values remain marked as not reported rather than estimated.
| County | Total | Original Medicare | MA & Other | MA & Other share | Part D share |
|---|---|---|---|---|---|
| Barnstable County | 88,240 | 66,608 | 21,632 | 24.5% | 83.5% |
| Berkshire County | 38,572 | 32,074 | 6,498 | 16.8% | 85.2% |
| Bristol County | 135,131 | 82,259 | 52,872 | 39.1% | 85.6% |
| Dukes County | 5,743 | 5,199 | 544 | 9.5% | 83.9% |
| Essex County | 182,521 | 118,083 | 64,438 | 35.3% | 83.5% |
| Franklin County | 21,438 | 14,533 | 6,905 | 32.2% | 84.3% |
| Hampden County | 110,327 | 60,261 | 50,066 | 45.4% | 86.4% |
| Hampshire County | 39,472 | 27,546 | 11,926 | 30.2% | 84.1% |
| Middlesex County | 308,949 | 203,671 | 105,278 | 34.1% | 81.5% |
| Nantucket County | 2,399 | 2,230 | 169 | 7% | 81% |
| Norfolk County | 152,887 | 103,320 | 49,567 | 32.4% | 81.6% |
| Plymouth County | 132,426 | 90,209 | 42,217 | 31.9% | 82.3% |
| Suffolk County | 115,304 | 66,863 | 48,441 | 42% | 83.5% |
| Unknown | Not reported | Not reported | Not reported | Not reported | Not reported |
| Worcester County | 183,139 | 102,433 | 80,706 | 44.1% | 84.4% |
Source and interpretation
CMS Medicare Monthly Enrollment, June 2026, published 2026-09-23. “MA & Other” retains the official combined CMS field label.
- CMS suppresses some small counts with an asterisk; suppressed values remain null in this snapshot.
- Medicare Advantage and Other Health Plans is the CMS-published combined measure and is not limited to Medicare Advantage alone.
- Enrollment counts describe a reporting month and do not compare plan benefits, provider networks, quality, or personal costs.