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Medicare Advantage Enrollment Tracker · District of Columbia

Medicare Advantage Enrollment in District of Columbia

District of Columbia had 34,063 Medicare Advantage members in September 2026, by the CMS county file, which includes employer group plans. That is up 0.5% from Sep 2025, slower than the national 2.0%. District of Columbia ranks 48th by members and holds 0.1% of the national total.

UnitedHealthcare leads with 62.0% of members who have a carrier label (contract file, September 2026). Among individual plans, which leave out employer group coverage, enrollment is up 0.7% in the 12 months to September 2026.

By Senior Deal Club Standards Desk · Data as of September 2026 · Editorial policy

Data as ofCMS public files, monthly snapshot

  • These totals include employer and union group plans.
    Why this matters

    The CMS contract and county files count group plans that retirees get through a former employer. They are not plans you can pick on your own. Counts here are larger than the individual-plan counts on county pages.

  • Some months are missing from the source.
    Why this matters

    CMS did not publish every month. Lines break at a missing month instead of guessing a value. A dotted line, where shown, only joins the two sides.

District of Columbia at a glance

Medicare Advantage members

34,063

District of Columbia members by month: from 23.5K in Jan 2023 to 34.1K in Sep 2026

County file · Sep 2026. Includes employer group plans. Rank: 48.

County file · Sep 2026
CMS state, county and plan-type file (SCP). The same plans split by state and county, with employer and union group plans included. CMS hides counts of 10 or fewer.

12-month change

+0.5%

up 0.5 percent vs Sep 2025

County file · Sep 2026. National: +2.0%.

Share of national total

0.1%

County file · Sep 2026. Of jurisdictions that report every month.

Individual plan members

29,350

Individual MA · Sep 2026. Employer group plans left out.

Individual MA · Sep 2026
Individual Medicare Advantage plans (IND), from county data. Employer and union group plans are left out, so counts are smaller than in the other two files.

Largest carrier

UnitedHealthcare

62.0% of members with a carrier label. Contract file · Sep 2026.

District of Columbia members by month

Medicare Advantage members in District of Columbia

Members, by month.

County file · Sep 2026
CMS state, county and plan-type file (SCP). The same plans split by state and county, with employer and union group plans included. CMS hides counts of 10 or fewer.
Medicare Advantage members in District of ColumbiaLine chart, January 2023 to September 2026. District of Columbia: 34.1K in September 2026. Shaded bands mark months with no data.20K25K30K35K2023202420252026District34.1K
Medicare Advantage members in District of ColumbiaLine chart, January 2023 to September 2026. District of Columbia: 34.1K in September 2026. Shaded bands mark months with no data.20K25K30K35K20232025District34.1K
  • District of Columbia
  • Shaded: no data that month
View the data table
Medicare Advantage members in District of Columbia: values by month
MonthDistrict of Columbia
Sep 202634.1K
Aug 202634.1K
Jul 202634K
Jun 202633.9K
May 202633.9K
Apr 202634K
Mar 202633.9K
Feb 202633.7K
Jan 202632.6K
Dec 202533.9K
Nov 202534K
Oct 202533.9K
Sep 202533.9K
Aug 202533.9K
Jul 202533.8K
Jun 202533.8K
May 202533.3K
Apr 202533.9K
Mar 202533.7K
Feb 202533.6K
Jan 202533.3K
Dec 202432.5K
Nov 202432.4K
Oct 202432.2K
Sep 202432.3K
Aug 202432.2K
Jul 202432.1K
Jun 202432K
May 202431.9K
Apr 202432.1K
Mar 202431.9K
Feb 202431.8K
Jan 202431.8K
Dec 2023–
Nov 202330.6K
Oct 202330.4K
Sep 202330.2K
Aug 202330K
Jul 2023–
Jun 202329.8K
May 202329.7K
Apr 202329.5K
Mar 202329.4K
Feb 202325.4K
Jan 202323.5K

County file · Sep 2026. Employer group plans included.

District of Columbia and the nation, Jan 2023 = 100

Each line is members divided by members in the start month, times 100.

County file · Sep 2026
CMS state, county and plan-type file (SCP). The same plans split by state and county, with employer and union group plans included. CMS hides counts of 10 or fewer.
District of Columbia and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. District of Columbia: 144.8 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.1001201401602023202420252026District144.8National117.8
District of Columbia and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. District of Columbia: 144.8 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.10012014016020232025District144.8National117.8
  • District of Columbia
  • National (same jurisdictions each month)
  • Shaded: no data that month
View the data table
District of Columbia and the nation, Jan 2023 = 100: values by month
MonthDistrict of ColumbiaNational (same jurisdictions each month)
Sep 2026144.8117.8
Aug 2026145117.8
Jul 2026144.7117.5
Jun 2026143.9117.4
May 2026144.3117.2
Apr 2026144.5116.9
Mar 2026144.2116.7
Feb 2026143.1116.3
Jan 2026138.4114.7
Dec 2025144.1115.9
Nov 2025144.4115.9
Oct 2025144.2115.7
Sep 2025144.1115.5
Aug 2025144115.3
Jul 2025143.8115
Jun 2025143.5114.8
May 2025141.5114.4
Apr 2025143.9114.2
Mar 2025143.2113.8
Feb 2025142.9113.4
Jan 2025141.5111.9
Dec 2024137.9112
Nov 2024137.6112
Oct 2024136.9111.7
Sep 2024137.3111.5
Aug 2024136.9111.2
Jul 2024136.4110.9
Jun 2024136.1110.7
May 2024135.7110.5
Apr 2024136.3110
Mar 2024135.6109.7
Feb 2024135109.3
Jan 2024135.1108.7
Dec 2023––
Nov 2023130.2105.9
Oct 2023129.1105.6
Sep 2023128.3105.2
Aug 2023127.6104.9
Jul 2023––
Jun 2023126.5104.1
May 2023126.3103.8
Apr 2023125.3103.4
Mar 2023124.8103
Feb 2023108.1102.2
Jan 2023100100

County file · Sep 2026. National line sums the jurisdictions that report in every month.

Individual plans

Individual plans leave out employer and union group coverage, so counts are smaller than in the county file.

Carrier share in District of Columbia

Share of members whose contract has a carrier label, September 2026 against September 2025.

Contract file · Sep 2026
CMS contract file (SCC). All Medicare Advantage contracts, with employer and union group plans included. It still lists Connecticut and Alaska.

UnitedHealthcare leads with 62.0% of members who have a carrier label (contract file, September 2026).

Humana gained 2.4 points in 12 months; most of that change came in January 2026.

UnitedHealthcare and Humana together hold 66.8%, about the same as in Sep 2025.

The market is less concentrated than a year earlier (direction only; the level depends on how carriers are grouped).

Carrier share, Sep 2025 to Sep 2026

Percent of members with a carrier label. Largest carriers.

Carrier share, Sep 2025 to Sep 2026Slope chart comparing Sep 2025 with Sep 2026. UnitedHealthcare: 64.8% to 62.0%; Kaiser: 20.0% to 19.5%; Aetna/CVS: 8.2% to 7.9%; Humana: 2.4% to 4.8%; HCSC/BCBS: 4.0% to 4.2%; CareFirst/BCBS: 0.5% to 1.4%.Sep 2025Sep 2026UnitedHealthcare 64.8%62.0% UnitedHealthcareKaiser 20.0%19.5% KaiserAetna/CVS 8.2%7.9% Aetna/CVSHumana 2.4%4.8% HumanaHCSC/BCBS 4.0%4.2% HCSC/BCBSCareFirst/BCBS 0.5%1.4% CareFirst/BCBS
Carrier share, Sep 2025 to Sep 2026Slope chart comparing Sep 2025 with Sep 2026. UnitedHealthcare: 64.8% to 62.0%; Kaiser: 20.0% to 19.5%; Aetna/CVS: 8.2% to 7.9%; Humana: 2.4% to 4.8%; HCSC/BCBS: 4.0% to 4.2%; CareFirst/BCBS: 0.5% to 1.4%.Sep 2025Sep 2026UHC 64.8%62.0%Kaiser 20.0%19.5%Aetna 8.2%7.9%Humana 2.4%4.8%Blue Cross 4.0%4.2%Blue Cross 0.5%1.4%
View the data table
Carrier share, Sep 2025 to Sep 2026: Sep 2025 and Sep 2026
NameSep 2025Sep 2026Change
UnitedHealthcare64.8%62.0%−2.8 pts
Kaiser20.0%19.5%−0.5 pts
Aetna/CVS8.2%7.9%−0.2 pts
Humana2.4%4.8%+2.4 pts
HCSC/BCBS4.0%4.2%+0.2 pts
CareFirst/BCBS0.5%1.4%+0.9 pts

Contract file · Sep 2026. Employer group plans included.

Carrier share of Medicare Advantage members with a carrier label, District of Columbia, September 2026
CarrierShare, Sep 2026Share, Sep 2025ChangeMembers
UnitedHealthcare62.0%64.8%−2.8 pts20,822
Kaiser19.5%20.0%−0.5 pts6,556
Aetna/CVS7.9%8.2%−0.2 pts2,667
Humana4.8%2.4%+2.4 pts1,616
HCSC/BCBS4.2%4.0%+0.2 pts1,394
CareFirst/BCBS1.4%0.5%+0.9 pts458
Elevance/Anthem0.1%0.1%0.0 pts35
BCBS Michigan0.1%0.1%0.0 pts25
Highmark/BCBS0.0%0.0%0.0 pts16
All other carriers0.0%––0

Insurer not assigned in CMS data: 1.1% of all members in Sep 2026, 1.0% in Sep 2025. Shares leave these members out. Contract IDs are renumbered each January, so this page follows carriers, not contracts. A contract that serves several states carries one carrier label, so a carrier can appear in a state where it is not a local plan. See the carrier view for the whole nation.

Biggest counties in District of Columbia

Individual plan members and the 12-month change for each county, from county data.

Individual MA · Sep 2026
Individual Medicare Advantage plans (IND), from county data. Employer and union group plans are left out, so counts are smaller than in the other two files.
Biggest counties in District of Columbia by individual Medicare Advantage members, September 2026
CountyMembers12-month changeLeading carrierLeader's share
District of Columbia29,350+0.7%UnitedHealthcare67.6%

Browse all counties.

Common questions

How many people have Medicare Advantage in District of Columbia?

District of Columbia had 34,063 members in September 2026, by the CMS county file (employer group plans included). Individual plans, which leave out employer group coverage, had 29,350 members in September 2026.

Is Medicare Advantage growing in District of Columbia?

Enrollment is up 0.5% from Sep 2025 to Sep 2026, slower than the national 2.0%. Among individual plans, which leave out employer group coverage, enrollment is up 0.7% in the 12 months to September 2026.

Which carrier has the most Medicare Advantage members in District of Columbia?

UnitedHealthcare leads with 62.0% of members who have a carrier label (contract file, September 2026). UnitedHealthcare and Humana together hold 66.8%, about the same as in Sep 2025. Shares leave out members whose contract has no carrier label: 1.1% of members.

Cite and download

Cite this page

Senior Deal Club Standards Desk. Medicare Advantage Enrollment in District of Columbia, data as of September 2026. Source: CMS public enrollment files. https://www.seniordealclub.com/medicare-advantage/enrollment/states/district-of-columbia

Download District of Columbia CSV

Data: CMS public enrollment files, in a monthly snapshot processed by TapQuality. Senior Deal Club is not affiliated with Medicare or any government agency.

These pages are educational. They are not plan advice. How the numbers are built · Editorial policy