MA Enrollment Explorer / States / District of Columbia
Medicare Advantage in District of Columbia: enrollment, penetration and market share
34,089 people in District of Columbia were enrolled in Medicare Advantage in October 2026. 34.4% of the state's 99,019 eligible Medicare beneficiaries are in Medicare Advantage, −0.3 pts since October 2025. UnitedHealth Group, Inc. is the largest parent organization with 62% of reported enrollment; 10 parent organizations have 11 or more members, and the market's HHI is 4,346 (highly concentrated). Through the 2026 Annual Election Period (December to February), reported MA enrollment in District of Columbia changed by −246 (−0.7%).
34.4%MA penetration, October 2026
34KMA enrollees
10parent organizations (11+ members)
4,346HHI, highly concentrated
Parent organizations in District of Columbia
| Parent organization | Members | Change | Share | Share change |
|---|---|---|---|---|
| UnitedHealth Group, Inc. | 21,005 | −825 | 62.2% | −2.6 pts |
| Kaiser Foundation Health Plan, Inc. | 6,573 | −115 | 19.5% | −0.4 pts |
| CVS Health Corporation | 2,656 | −102 | 7.9% | −0.3 pts |
| Humana Inc. | 1,593 | +780 | 4.7% | +2.3 pts |
| Health Care Service Corporation | 1,386 | +70 | 4.1% | +0.2 pts |
| CareFirst, Inc. | 455 | +284 | 1.3% | +0.8 pts |
| Element Care INC. | 43 | −1 | 0.1% | −0.00 pts |
| Elevance Health, Inc. | 35 | 0 | 0.1% | −0.00 pts |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 25 | −5 | under 0.1% | −0.02 pts |
| Highmark Health | 16 | 0 | under 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
| County | MA enrollees | Penetration | Leading parent |
|---|---|---|---|
| District of Columbia | 34,089 | 34.4% | UnitedHealth Group, Inc. 62% |