Medicare Advantage plans in Colorado, 2027
99 Medicare Advantage plans are sold in Colorado for 2027 (103 in 2026); 61 are open to everyone and 52 of those have a $0 premium everywhere they are sold. 31,842 Colorado members in September 2026 were in plans that end or leave their county for 2027.
What changes in Colorado for 2027?
| In the state | 2026 | 2027 | Change |
|---|---|---|---|
| Plans sold in the state | 103 | 99 | ▼down 4 |
| Plans open to everyone | 67 | 61 | ▼down 6 |
| Plans with a $0 premium everywhere they are sold | 51 | 52 | ▲up 1 |
| Plans that lower the Part B premium | 24 | 19 | ▼down 5 |
Source: CMS Medicare Advantage and Part D landscape files for 2027 (Sept. 22, 2026, revised Sept. 30) and 2026 (Sept. 2, 2026 revision); CMS plan benefit package files, 2027 and 2026.
Which companies sell the most plans in Colorado?
Plans open to everyone, by parent company and the brands it sells under, 2027
Source: CMS Medicare Advantage and Part D landscape files for 2027 (Sept. 22, 2026, revised Sept. 30) and 2026 (Sept. 2, 2026 revision).
Which Colorado counties lose the most?
Plans end in or leave Colorado counties 515 times for 2027. Counties with the most members in those plans come first; each links to its 2027 plan list.
| County | Plans open to all | $0 premium | Plans that end or leave | Their members here |
|---|---|---|---|---|
| Larimer | 24 | 19 | 16 | 3,049 |
| Weld | 25 | 20 | 18 | 2,803 |
| Mesa | 13 | 11 | 11 | 2,559 |
| El Paso | 25 | 21 | 14 | 1,677 |
| Boulder | 33 | 27 | 15 | 1,476 |
| Denver | 35 | 29 | 14 | 1,431 |
| Douglas | 32 | 26 | 20 | 1,425 |
| Jefferson | 37 | 31 | 14 | 1,285 |
| Las Animas | 5 | 5 | 12 | 1,244 |
| Arapahoe | 33 | 27 | 13 | 1,155 |
| Elbert | 16 | 13 | 22 | 1,034 |
| Montezuma | 2 | 2 | 5 | 963 |
| Adams | 36 | 30 | 13 | 835 |
| Morgan | 4 | 2 | 14 | 830 |
| Alamosa | 0 | 0 | 10 | 799 |
| Rio Grande | 0 | 0 | 7 | 793 |
| Delta | 10 | 8 | 14 | 775 |
| Montrose | 7 | 5 | 4 | 759 |
| Eagle | 0 | 0 | 2 | 741 |
| La Plata | 7 | 6 | 9 | 680 |
| Chaffee | 5 | 5 | 7 | 678 |
| Pueblo | 23 | 20 | 15 | 627 |
| Clear Creek | 18 | 14 | 27 | 514 |
| Archuleta | 3 | 2 | 11 | 466 |
| Summit | 8 | 7 | 3 | 453 |
| Conejos | 10 | 8 | 10 | 334 |
| Grand | 11 | 9 | 12 | 258 |
| Huerfano | 8 | 7 | 13 | 238 |
| Park | 15 | 12 | 17 | 233 |
| Logan | 4 | 2 | 3 | 219 |
| Broomfield | 32 | 26 | 14 | 208 |
| Teller | 21 | 18 | 19 | 188 |
| Custer | 8 | 7 | 13 | 185 |
| Fremont | 23 | 19 | 11 | 152 |
| Gilpin | 15 | 11 | 19 | 141 |
| Saguache | 8 | 7 | 7 | 119 |
| Lake | 7 | 7 | 4 | 116 |
| Washington | 8 | 7 | 14 | 77 |
| Yuma | 0 | 0 | 2 | 67 |
| Phillips | 0 | 0 | 2 | 55 |
| Lincoln | 8 | 7 | 10 | 43 |
| Ouray | 9 | 8 | 1 | 41 |
| Otero | 4 | 2 | 1 | 38 |
| Crowley | 9 | 7 | 12 | 23 |
| Gunnison | 9 | 8 | 1 | 21 |
| San Miguel | 3 | 2 | 1 | 18 |
| Rio Blanco | 3 | 2 | 1 | 17 |
| Baca | 0 | 0 | 0 | 0 |
| Bent | 8 | 7 | 1 | 0 |
| Cheyenne | 0 | 0 | 0 | 0 |
| Costilla | 9 | 7 | 1 | 0 |
| Dolores | 3 | 2 | 1 | 0 |
| Garfield | 0 | 0 | 0 | 0 |
| Hinsdale | 9 | 8 | 1 | 0 |
| Jackson | 8 | 7 | 12 | 0 |
| Kiowa | 5 | 5 | 0 | 0 |
| Kit Carson | 0 | 0 | 0 | 0 |
| Mineral | 9 | 8 | 1 | 0 |
| Moffat | 0 | 0 | 0 | 0 |
| Pitkin | 6 | 6 | 0 | 0 |
| Prowers | 0 | 0 | 0 | 0 |
| Routt | 1 | 1 | 0 | 0 |
| San Juan | 9 | 8 | 1 | 0 |
| Sedgwick | 0 | 0 | 0 | 0 |
Source: CMS Medicare Advantage and Part D landscape files for 2027 (Sept. 22, 2026, revised Sept. 30) and 2026 (Sept. 2, 2026 revision); CMS plan crosswalk from 2026 to 2027 (Oct. 1, 2026); CMS monthly enrollment by plan and by county, September 2026 (CMS hides counts under 11).
Which large plans sold in Colorado end?
| 2026 plan | Brand | Members in all states, Sept. 2026 |
|---|---|---|
| Erickson Advantage SignatureH5652-001 | UnitedHealthcare | 4,520 |
| Aetna Medicare SignatureH3931-153 | Aetna Medicare | 2,999 |
| AARP Medicare Advantage from UHC CO-0013H2406-104 | UnitedHealthcare | 2,780 |
| Humana Full AccessH5216-333 | Humana | 2,733 |
| Aetna Medicare SignatureH3931-154 | Aetna Medicare | 2,377 |
| HealthSpring PreferredH0672-024 | HealthSpring | 2,343 |
| Aetna Medicare SignatureH4711-008 | Aetna Medicare | 1,754 |
| AARP Medicare Advantage from UHC CO-0017H2406-110 | UnitedHealthcare | 1,339 |
| Select Health Medicare + KrogerH1994-030 | Select Health | 1,257 |
| Erickson Advantage LibertyH5652-008 | UnitedHealthcare | 1,044 |
Source: CMS plan crosswalk from 2026 to 2027 (Oct. 1, 2026); CMS monthly enrollment by plan and by county, September 2026 (CMS hides counts under 11).
Which plans in Colorado lower the Part B premium?
19 plans open to everyone and sold in at least one Colorado county pay part of the Part B premium in 2027; the largest reduction comes first.
Source: CMS plan benefit package files, 2027 and 2026; CMS Medicare Advantage and Part D landscape files for 2027 (Sept. 22, 2026, revised Sept. 30) and 2026 (Sept. 2, 2026 revision).
Which Colorado counties have no Medicare Advantage plan open to everyone in 2027?
12 counties in Colorado have no plan open to everyone for 2027: people there can use Original Medicare with a stand-alone drug plan and a Medigap policy, or a special needs plan if they qualify.
Alamosa, CO
No Medicare Advantage plan open to everyone is sold in Alamosa, Colorado for 2027. 14 plans were sold here in 2026; 10 of them leave, and the 4 plans sold for 2027 are special needs plans. People here can use Original Medicare with one of the 8 stand-alone drug plans offered in Colorado.
Baca, CO
No Medicare Advantage plan open to everyone is sold in Baca, Colorado for 2027. 2 plans were sold here in 2026; 0 of them leave, and the 2 plans sold for 2027 are special needs plans. People here can use Original Medicare with one of the 8 stand-alone drug plans offered in Colorado.
Cheyenne, CO
No Medicare Advantage plan open to everyone is sold in Cheyenne, Colorado for 2027. 4 plans were sold here in 2026; 0 of them leave, and the 4 plans sold for 2027 are special needs plans. People here can use Original Medicare with one of the 8 stand-alone drug plans offered in Colorado.
Eagle, CO
No Medicare Advantage plan open to everyone is sold in Eagle, Colorado for 2027. 4 plans were sold here in 2026; 2 of them leave, and the 2 plans sold for 2027 are special needs plans. People here can use Original Medicare with one of the 8 stand-alone drug plans offered in Colorado.
Garfield, CO
No Medicare Advantage plan open to everyone is sold in Garfield, Colorado for 2027. 2 plans were sold here in 2026; 0 of them leave, and the 2 plans sold for 2027 are special needs plans. People here can use Original Medicare with one of the 8 stand-alone drug plans offered in Colorado.
Kit Carson, CO
No Medicare Advantage plan open to everyone is sold in Kit Carson, Colorado for 2027. 4 plans were sold here in 2026; 0 of them leave, and the 4 plans sold for 2027 are special needs plans. People here can use Original Medicare with one of the 8 stand-alone drug plans offered in Colorado.
Moffat, CO
No Medicare Advantage plan open to everyone is sold in Moffat, Colorado for 2027. 2 plans were sold here in 2026; 0 of them leave, and the 2 plans sold for 2027 are special needs plans. People here can use Original Medicare with one of the 8 stand-alone drug plans offered in Colorado.
Phillips, CO
No Medicare Advantage plan open to everyone is sold in Phillips, Colorado for 2027. 6 plans were sold here in 2026; 2 of them leave, and the 4 plans sold for 2027 are special needs plans. People here can use Original Medicare with one of the 8 stand-alone drug plans offered in Colorado.
Prowers, CO
No Medicare Advantage plan open to everyone is sold in Prowers, Colorado for 2027. 4 plans were sold here in 2026; 0 of them leave, and the 4 plans sold for 2027 are special needs plans. People here can use Original Medicare with one of the 8 stand-alone drug plans offered in Colorado.
Rio Grande, CO
No Medicare Advantage plan open to everyone is sold in Rio Grande, Colorado for 2027. 9 plans were sold here in 2026; 7 of them leave, and the 2 plans sold for 2027 are special needs plans. People here can use Original Medicare with one of the 8 stand-alone drug plans offered in Colorado.
Sedgwick, CO
No Medicare Advantage plan open to everyone is sold in Sedgwick, Colorado for 2027. 4 plans were sold here in 2026; 0 of them leave, and the 4 plans sold for 2027 are special needs plans. People here can use Original Medicare with one of the 8 stand-alone drug plans offered in Colorado.
Yuma, CO
No Medicare Advantage plan open to everyone is sold in Yuma, Colorado for 2027. 6 plans were sold here in 2026; 2 of them leave, and the 4 plans sold for 2027 are special needs plans. People here can use Original Medicare with one of the 8 stand-alone drug plans offered in Colorado.
Source: CMS Medicare Advantage and Part D landscape files for 2027 (Sept. 22, 2026, revised Sept. 30) and 2026 (Sept. 2, 2026 revision); CMS plan crosswalk from 2026 to 2027 (Oct. 1, 2026).
570,146 of Colorado's 1,095,700 people with Medicare were in a Medicare Advantage plan in September 2026 (52%).
What else should you check?
- Every plan not offered in 2027By company and state
- Part B giveback plansWhere they are sold
- Every statePlan counts for 2027