UnitedHealth in Colorado: 198,040 Medicare Advantage members, 42.5% share, 1st of 11.
UnitedHealth Group, Inc., shown as UnitedHealth, lost 22,954 members (−10.4%) from Nov 2025 to Oct 2026 and stepped −11.8% at the 2026 election period against the market's −1.7%. It sells in 58 of Colorado’s 61 counties with visible members and leads 15, Humana just behind at 23.9%.
UnitedHealth's twelve months in Colorado
Visible members each month, Nov 2025 to Oct 2026. The December-to-January step is the election period. The market line for the state is on the Colorado page.
Where UnitedHealth's Colorado members are
The carrier’s five largest counties by visible members, with its share of each county’s visible Medicare Advantage members. It sells in 58 counties and leads 15 of them.
| County | UnitedHealth members | Share of county | County visible members | County leader |
|---|---|---|---|---|
| Jefferson | 31,490 | 50.1% | 62,857 | UnitedHealth |
| El Paso | 27,490 | 48.9% | 56,269 | UnitedHealth |
| Arapahoe | 23,173 | 44.2% | 52,426 | UnitedHealth |
| Adams | 18,311 | 45.1% | 40,626 | UnitedHealth |
| Denver | 18,108 | 36.7% | 49,286 | UnitedHealth |
UnitedHealth against the Colorado market
The carrier’s figures beside the state’s, each weighted by members. A difference is a difference, not a grade: a higher maximum or a lower rating is a design and a result, read in context.
top three hold 85.4%
market 3.97, −0.03, 3rd of 5 rated
market 90%, +10 points
market $5,500, +$0
| # | Carrier | Members | Share | Twelve months | Election step | Counties led | Rating | $0 premium |
|---|---|---|---|---|---|---|---|---|
| 1 | UnitedHealth | 198,040 | 42.5% | −10.4% | −11.8% | 15 of 58 | 3.94 | 100% |
| 2 | Humana | 111,415 | 23.9% | +35.9% | +28.3% | 26 of 49 | 4.24 | 91% |
| 3 | Kaiser | 88,214 | 18.9% | +2.4% | +0.9% | 1 of 17 | 4.00 | 62% |
| 4 | Aetna (CVS) | 28,063 | 6.0% | −0.5% | −3.5% | 2 of 32 | 3.75 | 100% |
| 5 | Devoted | 21,010 | 4.5% | +41.5% | +25.7% | 2 of 32 | 3.43 | 100% |
What 2027 does to UnitedHealth's plans in Colorado
The fate assigned to each of the carrier’s plans for 2027, joined to the members in it today.
4,694 members are in 7 plans that end and must choose again. 19,979 members move with 1 plan consolidated into another of the carrier’s plans. 101,322 members are in 7 plans that drop at least one county; which counties is not stated. In all, 64% of UnitedHealth’s Colorado members are in a plan whose service area or status changes.
The read on UnitedHealth in Colorado is in Carrier Command.
Risk and rebate against the market, the five-test read on coding versus selection, Stars levers and next year's cut points, the election-period forecast and the county-by-county standing, written as a monthly page.
UnitedHealth elsewhere, and the rest of Colorado
- Humana23.9%
- Kaiser18.9%
- Aetna (CVS)6.0%
- Devoted4.5%
How these numbers are made
- Members are visible members: CMS suppresses any plan-county cell of ten or fewer, so small counties undercount. Market share excludes employer group plans.
- Enrollment is Oct 2026; the twelve months run Nov 2025 to Oct 2026; the election step compares December 2025 with January 2026.
- UnitedHealth is the parent organization UnitedHealth Group, Inc.; its 25 plans in Colorado may sell under other brand names. The rating is the 2027 overall Star Rating of its contracts weighted by members in Colorado; $0 premium and the in-network maximum are the 2027 filings weighted by members today.
- Plan fates are the ones assigned for contract year 2027.
- Every figure comes from public CMS data as Livmor reads it, and the page is rebuilt when a new month posts. Livmor Carrier Command, public CMS data.