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MA Enrollment Explorer / States / Wisconsin

Medicare Advantage in Wisconsin: enrollment, penetration and market share

792,801 people in Wisconsin were enrolled in Medicare Advantage in October 2026. 57.3% of the state's 1,384,470 eligible Medicare beneficiaries are in Medicare Advantage, −0.9 pts since October 2025. UnitedHealth Group, Inc. is the largest parent organization with 35% of reported enrollment; 20 parent organizations have 11 or more members, and the market's HHI is 1,946 (highly concentrated). Through the 2026 Annual Election Period (December to February), reported MA enrollment in Wisconsin changed by −2,446 (−0.3%).

57.3%MA penetration, October 2026
793KMA enrollees
20parent organizations (11+ members)
1,946HHI, highly concentrated
Open Wisconsin on the market mapMSSP ACOs in Wisconsin

Parent organizations in Wisconsin

Parent organizationMembersChangeShareShare change
UnitedHealth Group, Inc.277,694−37,65935.2%−5.2 pts
Network Health, Inc.133,029+46,34716.8%+5.8 pts
Humana Inc.120,273+28,11315.2%+3.4 pts
Sanford Health79,309+8,27010.0%+1.0 pts
Medica Holding Company48,425+4,3016.1%+0.5 pts
CVS Health Corporation37,860+6,4484.8%+0.8 pts
Elevance Health, Inc.37,600−43,0064.8%−5.5 pts
University of Wisconsin Hospitals and Clincs Autho18,670−13,3662.4%−1.7 pts
Centene Corporation12,710+4,3061.6%+0.5 pts
HealthPartners, Inc.7,804−9871.0%−0.1 pts
Aspirus, Inc.5,937+3,6940.8%+0.5 pts
Medical Associates Clinic, P.C.3,722+690.5%+0.00 pts
Molina Healthcare, Inc.2,827+5800.4%+0.1 pts
Group Health Cooperative of Eau Claire1,338+1,2170.2%+0.2 pts
Blue Cross Blue Shield of Michigan Mutual Ins. Co.753+1under 0.1%−0.00 pts
CareSource743−157under 0.1%−0.02 pts
Health Care Service Corporation507+14under 0.1%+0.00 pts
Aware Integrated, Inc.357+221under 0.1%+0.03 pts
Highmark Health199−3under 0.1%−0.00 pts
DLP Marquette Health Plan, LLC13newunder 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
Milwaukee County113,71868.2%UnitedHealth Group, Inc. 60%
Waukesha County63,76059.5%UnitedHealth Group, Inc. 59%
Brown County41,12971.8%Network Health, Inc. 38%
Dane County41,03838.3%UnitedHealth Group, Inc. 28%
Outagamie County31,12473.6%Network Health, Inc. 54%
Racine County29,34263.3%UnitedHealth Group, Inc. 52%
Winnebago County27,61870.7%Network Health, Inc. 50%
Washington County22,50064.1%UnitedHealth Group, Inc. 54%
Marathon County21,14264.9%Sanford Health 56%
Rock County18,87949.7%UnitedHealth Group, Inc. 44%
Kenosha County18,79053.3%UnitedHealth Group, Inc. 49%
Sheboygan County17,79760.1%UnitedHealth Group, Inc. 39%
Fond du Lac County17,42668.7%Network Health, Inc. 56%
Manitowoc County14,63264.3%Network Health, Inc. 37%
Ozaukee County13,84155.9%UnitedHealth Group, Inc. 53%
Wood County13,81566.9%Sanford Health 66%
La Crosse County13,71050.5%University of Wisconsin Hospitals and Clincs Autho 57%
Walworth County12,22646.4%UnitedHealth Group, Inc. 50%
Dodge County11,84655.2%UnitedHealth Group, Inc. 36%
Eau Claire County11,15947.4%Sanford Health 47%
Waupaca County10,97473.8%Network Health, Inc. 48%
St. Croix County9,67647.6%Medica Holding Company 60%
Marinette County9,40667.3%UnitedHealth Group, Inc. 38%
Portage County9,17454.6%Sanford Health 42%
Jefferson County8,84744.4%UnitedHealth Group, Inc. 46%
Oconto County8,44873.6%Network Health, Inc. 36%
Chippewa County8,32550.6%Sanford Health 57%
Shawano County7,97671.2%Network Health, Inc. 39%
Calumet County7,51472.1%Network Health, Inc. 60%
Douglas County7,41163.4%Medica Holding Company 52%
Barron County7,23051.7%Sanford Health 58%
Oneida County6,89950.4%Sanford Health 47%
Polk County6,75951.5%Medica Holding Company 55%
Columbia County6,43043.3%Medica Holding Company 36%
Sauk County6,22037.8%Medica Holding Company 43%
Grant County6,14550.2%Medical Associates Clinic, P.C. 47%
Door County5,42747.1%Humana Inc. 36%
Waushara County5,41068.5%Network Health, Inc. 39%
Lincoln County5,39362.2%Sanford Health 46%
Pierce County4,95051.9%Medica Holding Company 64%
Dunn County4,84646.2%Sanford Health 39%
Clark County4,69161.3%Sanford Health 76%
Vilas County4,26044.0%Sanford Health 46%
Monroe County4,22339.4%University of Wisconsin Hospitals and Clincs Autho 42%
Langlade County4,14765.5%Sanford Health 39%
Green Lake County3,87367.2%Network Health, Inc. 56%
Adams County3,85245.3%UnitedHealth Group, Inc. 43%
Kewaunee County3,83570.6%Network Health, Inc. 39%
Trempealeau County3,58249.5%University of Wisconsin Hospitals and Clincs Autho 40%
Vernon County3,50042.3%CVS Health Corporation 60%
Green County3,38535.1%UnitedHealth Group, Inc. 41%
Taylor County3,28162.7%Sanford Health 65%
Washburn County3,27250.9%Sanford Health 50%
Sawyer County3,14148.1%Sanford Health 52%
Burnett County3,05246.8%Medica Holding Company 32%
Juneau County3,02440.3%Humana Inc. 30%
Marquette County2,90655.2%Network Health, Inc. 33%
Price County2,68752.8%Sanford Health 66%
Rusk County2,62956.5%Sanford Health 70%
Bayfield County2,52142.3%Sanford Health 36%
Jackson County2,29043.5%Sanford Health 52%
Iowa County2,27835.5%Medica Holding Company 41%
Ashland County1,99943.9%Sanford Health 47%
Lafayette County1,71341.9%Medical Associates Clinic, P.C. 41%
Forest County1,57352.6%UnitedHealth Group, Inc. 36%
Crawford County1,51531.9%Humana Inc. 31%
Richland County1,47031.9%Humana Inc. 48%
Buffalo County1,45738.9%Sanford Health 36%
Iron County1,27954.5%Sanford Health 62%
Pepin County92240.5%Sanford Health 52%
Florence County89048.3%UnitedHealth Group, Inc. 41%
Menominee County60260.6%UnitedHealth Group, Inc. 40%