MA Enrollment Explorer / States / Massachusetts

Medicare Advantage in Massachusetts: enrollment, penetration and market share

543,667 people in Massachusetts were enrolled in Medicare Advantage in October 2026. 35.6% of the state's 1,527,562 eligible Medicare beneficiaries are in Medicare Advantage, −0.7 pts since October 2025. Point32Health, Inc. is the largest parent organization with 23% of reported enrollment; 27 parent organizations have 11 or more members, and the market's HHI is 1,505 (moderately concentrated). Through the 2026 Annual Election Period (December to February), reported MA enrollment in Massachusetts changed by −2,343 (−0.4%).

35.6%MA penetration, October 2026

544KMA enrollees

27parent organizations (11+ members)

1,505HHI, moderately concentrated

Open Massachusetts on the market map MSSP ACOs in Massachusetts

Parent organizations in Massachusetts

Parent organization	Members	Change	Share	Share change
Point32Health, Inc.	124,509	−9,075	23.0%	−1.8 pts
UnitedHealth Group, Inc.	111,870	−10,650	20.7%	−2.1 pts
Blue Cross and Blue Shield of Massachusetts, Inc.	86,884	−11,516	16.1%	−2.2 pts
CVS Health Corporation	69,501	+5,172	12.9%	+0.9 pts
CareSource	44,731	−64	8.3%	−0.1 pts
Fallon Community Health Plan, Inc.	23,290	+497	4.3%	+0.1 pts
Mass General Brigham Incorporated	21,349	+13,500	3.9%	+2.5 pts
Baystate Health, Inc.	14,953	+2,189	2.8%	+0.4 pts
Humana Inc.	10,895	+3,501	2.0%	+0.6 pts
Molina Healthcare, Inc.	10,454	+198	1.9%	+0.03 pts
Central Mass Health Holding LLC	7,771	+3,989	1.4%	+0.7 pts
Eternal Health of Delaware, Inc.	7,663	+5,769	1.4%	+1.1 pts
Elevance Health, Inc.	1,365	+41	0.3%	+0.01 pts
Element Care, Inc.	1,147	+49	0.2%	+0.01 pts
NEIGHBORHEALTH CORPORATION	830	−1	0.2%	−0.00 pts
Cambridge Health Alliance	668	+2	0.1%	−0.00 pts
Serenity Care, Inc.	607	+34	0.1%	+0.01 pts
Harbor Health Services, Inc.	498	−28	under 0.1%	−0.01 pts
Blue Cross & Blue Shield of Rhode Island	381	−4	under 0.1%	−0.00 pts
Uphams Corner Health Committee, Inc.	272	−8	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
Middlesex County	105,854	34.1%	Point32Health, Inc. 39%
Worcester County	80,973	44.0%	CVS Health Corporation 20%
Essex County	65,004	35.4%	UnitedHealth Group, Inc. 30%
Bristol County	53,342	39.2%	UnitedHealth Group, Inc. 24%
Hampden County	50,260	45.3%	CareSource 27%
Norfolk County	49,575	32.0%	Point32Health, Inc. 29%
Suffolk County	48,823	41.9%	UnitedHealth Group, Inc. 29%
Plymouth County	42,499	31.8%	UnitedHealth Group, Inc. 22%
Barnstable County	21,360	24.1%	Blue Cross and Blue Shield of Massachusetts, Inc. 40%
Hampshire County	11,935	29.7%	Blue Cross and Blue Shield of Massachusetts, Inc. 36%
Franklin County	6,934	32.3%	Blue Cross and Blue Shield of Massachusetts, Inc. 40%
Berkshire County	6,454	16.8%	Baystate Health, Inc. 49%
Dukes County	503	8.7%	Mass General Brigham Incorporated 51%
Nantucket County	151	6.2%	Mass General Brigham Incorporated 64%