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MA Enrollment Explorer / States / Colorado

Medicare Advantage in Colorado: enrollment, penetration and market share

571,411 people in Colorado were enrolled in Medicare Advantage in October 2026. 52.0% of the state's 1,098,270 eligible Medicare beneficiaries are in Medicare Advantage, −1.0 pts since October 2025. UnitedHealth Group, Inc. is the largest parent organization with 44% of reported enrollment; 21 parent organizations have 11 or more members, and the market's HHI is 2,844 (highly concentrated). Through the 2026 Annual Election Period (December to February), reported MA enrollment in Colorado changed by −1,645 (−0.3%).

52.0%MA penetration, October 2026
571KMA enrollees
21parent organizations (11+ members)
2,844HHI, highly concentrated
Open Colorado on the market mapMSSP ACOs in Colorado

Parent organizations in Colorado

Parent organizationMembersChangeShareShare change
UnitedHealth Group, Inc.251,349−25,54844.2%−5.0 pts
Humana Inc.116,522+30,01620.5%+5.1 pts
Kaiser Foundation Health Plan, Inc.115,166+1,80720.3%+0.1 pts
CVS Health Corporation36,152+576.4%−0.1 pts
Devoted Health, Inc.21,417+6,4033.8%+1.1 pts
Intermountain Health Care, Inc.7,395+2,6681.3%+0.5 pts
Denver Health and Hospital Authority5,073+340.9%−0.00 pts
Elevance Health, Inc.4,614+1900.8%+0.03 pts
Health Care Service Corporation3,720−8,5870.7%−1.5 pts
Total Community Options, Inc.3,006+890.5%+0.01 pts
Bethesda Foundation1,062+520.2%+0.01 pts
Blue Cross Blue Shield of Michigan Mutual Ins. Co.803−170.1%−0.00 pts
Highmark Health404+302under 0.1%+0.1 pts
Longevity Health Founders, LLC375−27under 0.1%−0.01 pts
TRU Community Care323+17under 0.1%+0.00 pts
Volunteers of America National Services307+11under 0.1%+0.00 pts
Hopewest241+43under 0.1%+0.01 pts
Perennial Consortium, LLC218+73under 0.1%+0.01 pts
UMWA Health and Retirement Funds166−16under 0.1%−0.00 pts
California Physicians' Service70+1under 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
Jefferson County76,79562.5%UnitedHealth Group, Inc. 48%
El Paso County67,43151.0%UnitedHealth Group, Inc. 49%
Arapahoe County62,74657.6%UnitedHealth Group, Inc. 43%
Denver County59,58959.0%UnitedHealth Group, Inc. 36%
Adams County47,33864.3%UnitedHealth Group, Inc. 43%
Larimer County37,58347.5%UnitedHealth Group, Inc. 48%
Douglas County34,18450.1%UnitedHealth Group, Inc. 48%
Weld County32,40556.8%UnitedHealth Group, Inc. 40%
Boulder County31,12547.5%UnitedHealth Group, Inc. 49%
Pueblo County25,68162.3%UnitedHealth Group, Inc. 57%
Mesa County19,23945.8%Humana Inc. 43%
Fremont County8,14659.5%UnitedHealth Group, Inc. 67%
Broomfield County8,11861.5%UnitedHealth Group, Inc. 44%
Montrose County5,43541.2%Humana Inc. 58%
Delta County4,98546.7%Humana Inc. 57%
La Plata County4,16330.2%CVS Health Corporation 51%
Teller County4,10253.3%UnitedHealth Group, Inc. 52%
Elbert County3,19648.3%UnitedHealth Group, Inc. 39%
Otero County2,93860.6%Humana Inc. 67%
Montezuma County2,56732.5%UnitedHealth Group, Inc. 36%
Morgan County2,28239.8%UnitedHealth Group, Inc. 40%
Las Animas County2,26548.9%Humana Inc. 47%
Chaffee County2,21935.0%Humana Inc. 34%
Park County2,00343.2%Humana Inc. 40%
Logan County1,78938.1%UnitedHealth Group, Inc. 52%
Alamosa County1,55645.1%Humana Inc. 53%
Rio Grande County1,41239.0%Humana Inc. 58%
Archuleta County1,40729.0%CVS Health Corporation 35%
Huerfano County1,40251.4%Humana Inc. 38%
Eagle County1,34116.0%UnitedHealth Group, Inc. 90%
Garfield County1,33012.4%UnitedHealth Group, Inc. 92%
Clear Creek County1,18352.3%UnitedHealth Group, Inc. 54%
Conejos County1,09052.6%UnitedHealth Group, Inc. 34%
Grand County1,07332.9%UnitedHealth Group, Inc. 42%
Summit County99621.8%UnitedHealth Group, Inc. 71%
Custer County90741.7%Humana Inc. 40%
Saguache County79348.9%Humana Inc. 43%
Routt County78815.1%UnitedHealth Group, Inc. 49%
Costilla County77454.8%Humana Inc. 41%
Gilpin County68049.9%Kaiser Foundation Health Plan, Inc. 34%
Gunnison County59219.7%UnitedHealth Group, Inc. 45%
Bent County56348.5%Humana Inc. 64%
Rio Blanco County47731.2%Humana Inc. 62%
Crowley County47451.7%Humana Inc. 55%
Prowers County45217.1%UnitedHealth Group, Inc. 97%
Ouray County43423.5%Humana Inc. 51%
Lake County39234.0%UnitedHealth Group, Inc. 55%
Lincoln County34831.6%UnitedHealth Group, Inc. 38%
Washington County33828.9%UnitedHealth Group, Inc. 40%
Moffat County32311.7%UnitedHealth Group, Inc. 88%
Pitkin County2817.8%Devoted Health, Inc. 56%
San Miguel County28020.8%Humana Inc. 64%
Yuma County26412.6%UnitedHealth Group, Inc. 100%
Kit Carson County20712.6%UnitedHealth Group, Inc. 100%
Dolores County18128.9%Humana Inc. 67%
Phillips County17517.4%UnitedHealth Group, Inc. 100%
Mineral County10833.9%Humana Inc. 50%
Jackson County8825.4%Humana Inc. 70%
Baca County808.3%UnitedHealth Group, Inc. 100%
Kiowa County7519.6%UnitedHealth Group, Inc. 100%
Sedgwick County749.6%UnitedHealth Group, Inc. 100%
Hinsdale County6827.6%Humana Inc. 41%
Cheyenne County4911.9%UnitedHealth Group, Inc. 100%
San Juan County3218.7%Humana Inc. 100%