Mass General Brigham Incorporated in Massachusetts: 21,342 Medicare Advantage members, 4.4% share, 6th of 13.
Mass General Brigham Incorporated added 13,356 members (+167.2%) from Nov 2025 to Oct 2026 and stepped +112.8% at the 2026 election period against the market's +5.5%. It sells in 10 of Massachusetts’s 14 counties with visible members and leads 1; CareSource sits just ahead at 9.2%, Fallon Community Health Plan, Inc. just behind at 4.4%.
Mass General Brigham Incorporated's twelve months in Massachusetts
Visible members each month, Nov 2025 to Oct 2026. The December-to-January step is the election period. The market line for the state is on the Massachusetts page.
Where Mass General Brigham Incorporated's Massachusetts members are
The carrier’s five largest counties by visible members, with its share of each county’s visible Medicare Advantage members. It sells in 10 counties and leads 1 of them.
| County | Mass General Brigham Incorporated members | Share of county | County visible members | County leader |
|---|---|---|---|---|
| Middlesex | 5,183 | 5.5% | 94,312 | Point32Health, Inc. |
| Essex | 5,160 | 8.9% | 58,126 | UnitedHealth |
| Norfolk | 3,185 | 7.3% | 43,866 | Point32Health, Inc. |
| Suffolk | 3,134 | 7.0% | 44,925 | UnitedHealth |
| Plymouth | 2,796 | 7.6% | 37,001 | Point32Health, Inc. |
Mass General Brigham Incorporated against the Massachusetts market
The carrier’s figures beside the state’s, each weighted by members. A difference is a difference, not a grade: a higher maximum or a lower rating is a design and a result, read in context.
top three hold 60.7%
market 3.95, −0.45, 8th of 9 rated
market 74%, −41 points
market $7,150, −$2,150
| # | Carrier | Members | Share | Twelve months | Election step | Counties led | Rating | $0 premium |
|---|---|---|---|---|---|---|---|---|
| 1 | Point32Health, Inc. | 116,339 | 24.0% | −1.4% | −3.0% | 3 of 10 | 3.92 | 35% |
| 2 | UnitedHealth | 94,148 | 19.4% | −3.4% | −0.7% | 3 of 11 | 3.87 | 76% |
| 3 | Blue Cross and Blue Shield of Massachusetts, Inc. | 83,706 | 17.3% | −13.0% | −22.3% | 4 of 11 | 4.25 | 69% |
| 4 | Aetna (CVS) | 53,152 | 11.0% | +16.2% | +7.5% | 0 of 9 | 3.79 | 100% |
| 5 | CareSource | 44,731 | 9.2% | +163.2% | +160.2% | 1 of 12 | 4.50 | 100% |
| 6 | Mass General Brigham Incorporated | 21,342 | 4.4% | +167.2% | +112.8% | 1 of 10 | 3.50 | 33% |
| 7 | Fallon Community Health Plan, Inc. | 21,194 | 4.4% | +2.3% | −0.2% | 0 of 12 | 3.76 | 73% |
| 8 | Baystate Health, Inc. | 14,537 | 3.0% | +17.8% | +10.0% | 1 of 4 | 3.00 | 38% |
| 9 | Molina | 10,444 | 2.2% | +0.6% | +1.8% | 0 of 8 | 4.50 | 100% |
What 2027 does to Mass General Brigham Incorporated's plans in Massachusetts
The fate assigned to each of the carrier’s plans for 2027, joined to the members in it today.
18,219 members are in 3 plans that end and must choose again. In all, 85% of Mass General Brigham Incorporated’s Massachusetts members are in a plan whose service area or status changes.
The read on Mass General Brigham Incorporated in Massachusetts is in Carrier Command.
Risk and rebate against the market, the five-test read on coding versus selection, Stars levers and next year's cut points, the election-period forecast and the county-by-county standing, written as a monthly page.
Mass General Brigham Incorporated elsewhere, and the rest of Massachusetts
How these numbers are made
- Members are visible members: CMS suppresses any plan-county cell of ten or fewer, so small counties undercount. Market share excludes employer group plans.
- Enrollment is Oct 2026; the twelve months run Nov 2025 to Oct 2026; the election step compares December 2025 with January 2026.
- Mass General Brigham Incorporated is the parent organization Mass General Brigham Incorporated; its 6 plans in Massachusetts may sell under other brand names. The rating is the 2027 overall Star Rating of its contracts weighted by members in Massachusetts; $0 premium and the in-network maximum are the 2027 filings weighted by members today.
- Plan fates are the ones assigned for contract year 2027.
- Every figure comes from public CMS data as Livmor reads it, and the page is rebuilt when a new month posts. Livmor Carrier Command, public CMS data.