MA Enrollment Explorer / States / Maine
Medicare Advantage in Maine: enrollment, penetration and market share
231,172 people in Maine were enrolled in Medicare Advantage in October 2026. 58.8% of the state's 393,040 eligible Medicare beneficiaries are in Medicare Advantage, −0.3 pts since October 2025. Martin's Point Health Care, Inc. is the largest parent organization with 29% of reported enrollment; 11 parent organizations have 11 or more members, and the market's HHI is 1,955 (highly concentrated). Through the 2026 Annual Election Period (December to February), reported MA enrollment in Maine changed by −297 (−0.1%).
58.8%MA penetration, October 2026
231KMA enrollees
11parent organizations (11+ members)
1,955HHI, highly concentrated
Parent organizations in Maine
| Parent organization | Members | Change | Share | Share change |
|---|---|---|---|---|
| Martin's Point Health Care, Inc. | 66,077 | −5,806 | 28.7% | −3.0 pts |
| UnitedHealth Group, Inc. | 52,611 | +2,613 | 22.8% | +0.8 pts |
| CVS Health Corporation | 37,602 | +749 | 16.3% | +0.1 pts |
| Elevance Health, Inc. | 26,542 | −3,734 | 11.5% | −1.8 pts |
| Humana Inc. | 26,145 | +9,570 | 11.4% | +4.1 pts |
| Centene Corporation | 20,878 | −179 | 9.1% | −0.2 pts |
| Health Care Service Corporation | 304 | +66 | 0.1% | +0.03 pts |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 74 | −77 | under 0.1% | −0.03 pts |
| Blue Cross and Blue Shield of Massachusetts, Inc. | 30 | 0 | under 0.1% | −0.00 pts |
| Highmark Health | 26 | 0 | under 0.1% | −0.00 pts |
| California Physicians' Service | 16 | +3 | under 0.1% | +0.00 pts |
Change and share change are since October 2025. Shares are of reported enrollment in the CMS State/County/Contract file.
Counties
| County | MA enrollees | Penetration | Leading parent |
|---|---|---|---|
| Cumberland County | 47,418 | 60.8% | Martin's Point Health Care, Inc. 39% |
| York County | 32,984 | 53.6% | Martin's Point Health Care, Inc. 26% |
| Penobscot County | 24,152 | 58.4% | UnitedHealth Group, Inc. 27% |
| Kennebec County | 22,740 | 64.3% | UnitedHealth Group, Inc. 25% |
| Androscoggin County | 18,171 | 66.8% | Martin's Point Health Care, Inc. 36% |
| Aroostook County | 11,389 | 53.5% | Centene Corporation 42% |
| Oxford County | 11,348 | 61.7% | UnitedHealth Group, Inc. 31% |
| Somerset County | 9,541 | 60.8% | Elevance Health, Inc. 30% |
| Hancock County | 9,229 | 52.3% | Martin's Point Health Care, Inc. 40% |
| Knox County | 7,625 | 55.9% | UnitedHealth Group, Inc. 29% |
| Waldo County | 7,567 | 58.8% | Martin's Point Health Care, Inc. 28% |
| Lincoln County | 7,544 | 58.8% | Martin's Point Health Care, Inc. 30% |
| Sagadahoc County | 6,778 | 59.0% | Martin's Point Health Care, Inc. 36% |
| Franklin County | 6,222 | 68.1% | Humana Inc. 25% |
| Washington County | 4,949 | 46.8% | UnitedHealth Group, Inc. 30% |
| Piscataquis County | 3,515 | 58.8% | UnitedHealth Group, Inc. 29% |