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MA Enrollment Explorer / States / Michigan

Medicare Advantage in Michigan: enrollment, penetration and market share

1,486,251 people in Michigan were enrolled in Medicare Advantage in October 2026. 63.5% of the state's 2,339,304 eligible Medicare beneficiaries are in Medicare Advantage, +0.2 pts since October 2025. Blue Cross Blue Shield of Michigan Mutual Ins. Co. is the largest parent organization with 36% of reported enrollment; 33 parent organizations have 11 or more members, and the market's HHI is 2,141 (highly concentrated). Through the 2026 Annual Election Period (December to February), reported MA enrollment in Michigan changed by +16,213 (+1.1%).

63.5%MA penetration, October 2026
1.49MMA enrollees
33parent organizations (11+ members)
2,141HHI, highly concentrated
Open Michigan on the market mapMSSP ACOs in Michigan

Parent organizations in Michigan

Parent organizationMembersChangeShareShare change
Blue Cross Blue Shield of Michigan Mutual Ins. Co.536,838−71,53636.2%−5.8 pts
Corewell Health285,923+32,33019.3%+1.8 pts
Humana Inc.250,391+45,82116.9%+2.8 pts
Henry Ford Health System135,748+43,6739.2%+2.8 pts
CVS Health Corporation104,381+2,1707.0%−0.01 pts
UnitedHealth Group, Inc.79,569−12,9905.4%−1.0 pts
Centene Corporation30,274−1,7442.0%−0.2 pts
Molina Healthcare, Inc.15,246−3,0431.0%−0.2 pts
Zing Health Consolidator, Inc12,211+3,9310.8%+0.3 pts
Trinity Health Corporation10,984+4,9430.7%+0.3 pts
DLP Marquette Health Plan, LLC2,965new0.2%+0.2 pts
Elevance Health, Inc.2,895−170.2%−0.01 pts
MEDICAL MUTUAL OF OHIO2,819−430.2%−0.01 pts
McLaren Health Care Corporation2,272−5310.2%−0.04 pts
Independence Health Group, Inc.1,773−7110.1%−0.1 pts
Curana Health Holdings, LLC1,481+439under 0.1%+0.03 pts
Longevity Health Founders, LLC1,304+39under 0.1%+0.00 pts
Comprehensive Senior Care Corporation678+19under 0.1%+0.00 pts
LifeCircles484+37under 0.1%+0.00 pts
Care Resources412+38under 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

CountyMA enrolleesPenetrationLeading parent
Wayne County230,18864.9%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 33%
Oakland County155,59655.5%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 45%
Macomb County120,82660.3%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 39%
Kent County93,48674.4%Corewell Health 61%
Genesee County67,60869.7%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 46%
Ottawa County49,36477.3%Corewell Health 66%
Washtenaw County41,59759.4%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 60%
Kalamazoo County36,48665.7%Corewell Health 36%
Ingham County36,40067.1%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 46%
Saginaw County33,22868.2%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 36%
Muskegon County33,05175.5%Corewell Health 38%
St. Clair County27,02962.8%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 42%
Livingston County26,95455.0%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 55%
Jackson County23,90561.4%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 40%
Monroe County23,72862.2%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 42%
Berrien County22,78057.1%Humana Inc. 35%
Allegan County20,41171.7%Corewell Health 59%
Eaton County19,26872.0%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 55%
Bay County18,72763.9%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 40%
Calhoun County18,32156.0%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 29%
Grand Traverse County17,53564.7%Corewell Health 44%
Lenawee County15,51061.3%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 47%
Lapeer County14,53462.8%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 48%
Midland County13,66164.7%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 35%
Van Buren County12,88064.9%Corewell Health 35%
Clinton County12,51071.1%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 59%
Shiawassee County11,96267.9%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 49%
Montcalm County11,60771.7%Corewell Health 45%
Newaygo County10,45775.5%Corewell Health 59%
Barry County10,37167.4%Corewell Health 51%
Marquette County10,20459.2%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 41%
Ionia County10,20274.3%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 41%
Tuscola County10,04768.3%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 40%
St. Joseph County8,32357.5%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 29%
Hillsdale County7,70567.3%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 31%
Isabella County7,56659.2%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 46%
Cass County7,50353.7%Humana Inc. 42%
Mecosta County7,42167.4%Corewell Health 41%
Clare County7,06467.2%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 36%
Sanilac County6,94459.0%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 34%
Roscommon County6,79964.9%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 42%
Delta County6,73156.6%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 41%
Branch County6,48359.6%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 42%
Mason County6,41766.8%Corewell Health 48%
Gratiot County6,34667.6%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 50%
Wexford County6,15465.6%Corewell Health 37%
Gladwin County6,02666.9%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 40%
Emmet County5,77954.0%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 36%
Iosco County5,74959.2%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 42%
Huron County5,71055.4%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 33%
Oceana County5,56371.0%Corewell Health 44%
Alpena County5,56057.5%Corewell Health 41%
Manistee County5,46963.1%Corewell Health 38%
Cheboygan County5,14056.8%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 36%
Antrim County5,07259.8%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 34%
Leelanau County5,03757.2%Corewell Health 45%
Chippewa County5,00656.1%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 60%
Charlevoix County4,84556.0%Corewell Health 35%
Osceola County4,60666.7%Corewell Health 46%
Ogemaw County4,52259.4%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 42%
Houghton County4,34853.0%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 50%
Otsego County4,12255.4%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 37%
Menominee County4,00555.5%Humana Inc. 71%
Dickinson County3,97651.3%Humana Inc. 50%
Benzie County3,77460.4%Corewell Health 37%
Arenac County3,49465.8%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 39%
Kalkaska County3,40963.6%Corewell Health 30%
Presque Isle County3,14158.9%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 36%
Lake County3,06568.2%Corewell Health 35%
Missaukee County2,78964.2%Corewell Health 40%
Alcona County2,75758.8%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 44%
Crawford County2,73361.1%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 39%
Montmorency County2,61262.1%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 39%
Iron County2,46956.2%Humana Inc. 49%
Mackinac County2,24756.9%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 62%
Gogebic County2,16645.9%Humana Inc. 56%
Oscoda County1,96660.5%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 38%
Schoolcraft County1,63558.3%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 51%
Alger County1,57954.8%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 54%
Baraga County1,29659.1%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 37%
Ontonagon County1,17746.6%Humana Inc. 40%
Luce County1,11964.9%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 56%
Keweenaw County39947.7%Blue Cross Blue Shield of Michigan Mutual Ins. Co. 49%