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Medicare Advantage Enrollment Tracker · Delaware

Medicare Advantage Enrollment in Delaware

Delaware had 84,844 Medicare Advantage members in September 2026, by the CMS county file, which includes employer group plans. That is up 2.7% from Sep 2025, faster than the national 2.0%. Delaware ranks 44th by members and holds 0.2% of the national total.

UnitedHealthcare leads with 41.0% of members who have a carrier label (contract file, September 2026). Among individual plans, which leave out employer group coverage, enrollment is up 3.3% 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.

Delaware at a glance

Medicare Advantage members

84,844

Delaware members by month: from 67K in Jan 2023 to 84.8K in Sep 2026

County file · Sep 2026. Includes employer group plans. Rank: 44.

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

+2.7%

up 2.7 percent vs Sep 2025

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

Share of national total

0.2%

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

Individual plan members

67,103

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

41.0% of members with a carrier label. Contract file · Sep 2026.

Delaware members by month

Medicare Advantage members in Delaware

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 DelawareLine chart, January 2023 to September 2026. Delaware: 84.8K in September 2026. Shaded bands mark months with no data.65K70K75K80K85K2023202420252026Delaware84.8K
Medicare Advantage members in DelawareLine chart, January 2023 to September 2026. Delaware: 84.8K in September 2026. Shaded bands mark months with no data.65K70K75K80K85K20232025Delaware84.8K
  • Delaware
  • Shaded: no data that month
View the data table
Medicare Advantage members in Delaware: values by month
MonthDelaware
Sep 202684.8K
Aug 202684.6K
Jul 202684.5K
Jun 202684.3K
May 202684.1K
Apr 202683.6K
Mar 202683.4K
Feb 202682.6K
Jan 202679.6K
Dec 202582.9K
Nov 202582.9K
Oct 202582.8K
Sep 202582.6K
Aug 202582.6K
Jul 202582.4K
Jun 202582.2K
May 202582.1K
Apr 202581.9K
Mar 202581.6K
Feb 202581.1K
Jan 202579K
Dec 202478.9K
Nov 202478.9K
Oct 202478.7K
Sep 202478.5K
Aug 202478.1K
Jul 202477.8K
Jun 202477.6K
May 202477.3K
Apr 202477.1K
Mar 202476.7K
Feb 202476.4K
Jan 202476K
Dec 2023–
Nov 202371.9K
Oct 202371.5K
Sep 202371.1K
Aug 202370.8K
Jul 2023–
Jun 202370.1K
May 202369.8K
Apr 202369.4K
Mar 202369K
Feb 202368.8K
Jan 202367K

County file · Sep 2026. Employer group plans included.

Delaware 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.
Delaware and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Delaware: 126.7 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.1001101201302023202420252026Delaware126.7National117.8
Delaware and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Delaware: 126.7 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.10011012013020232025Delaware126.7National117.8
  • Delaware
  • National (same jurisdictions each month)
  • Shaded: no data that month
View the data table
Delaware and the nation, Jan 2023 = 100: values by month
MonthDelawareNational (same jurisdictions each month)
Sep 2026126.7117.8
Aug 2026126.3117.8
Jul 2026126.1117.5
Jun 2026125.9117.4
May 2026125.5117.2
Apr 2026124.9116.9
Mar 2026124.5116.7
Feb 2026123.3116.3
Jan 2026118.8114.7
Dec 2025123.8115.9
Nov 2025123.8115.9
Oct 2025123.6115.7
Sep 2025123.4115.5
Aug 2025123.3115.3
Jul 2025123115
Jun 2025122.8114.8
May 2025122.5114.4
Apr 2025122.3114.2
Mar 2025121.9113.8
Feb 2025121113.4
Jan 2025117.9111.9
Dec 2024117.8112
Nov 2024117.8112
Oct 2024117.4111.7
Sep 2024117.2111.5
Aug 2024116.6111.2
Jul 2024116.2110.9
Jun 2024115.9110.7
May 2024115.4110.5
Apr 2024115.1110
Mar 2024114.5109.7
Feb 2024114.1109.3
Jan 2024113.4108.7
Dec 2023––
Nov 2023107.4105.9
Oct 2023106.8105.6
Sep 2023106.1105.2
Aug 2023105.7104.9
Jul 2023––
Jun 2023104.6104.1
May 2023104.2103.8
Apr 2023103.6103.4
Mar 2023103103
Feb 2023102.7102.2
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 Delaware

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 41.0% of members who have a carrier label (contract file, September 2026).

UnitedHealthcare gained 5.7 points in 12 months; most of that change came in January 2026.

Highmark/BCBS lost 12.1 points in 12 months; most of that change came in January 2026.

UnitedHealthcare and Humana together hold 50.3%, up 7.2 points from Sep 2025.

The market is more 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: 35.3% to 41.0%; Aetna/CVS: 26.9% to 28.7%; Highmark/BCBS: 22.5% to 10.4%; Humana: 7.7% to 9.2%; Centene/Wellcare: 2.0% to 4.7%; HCSC/BCBS: 3.9% to 2.6%.Sep 2025Sep 2026UnitedHealthcare 35.3%41.0% UnitedHealthcareAetna/CVS 26.9%28.7% Aetna/CVSHighmark/BCBS 22.5%10.4% Highmark/BCBSHumana 7.7%9.2% HumanaCentene/Wellcare 2.0%4.7% Centene/WellcareHCSC/BCBS 3.9%2.6% HCSC/BCBS
Carrier share, Sep 2025 to Sep 2026Slope chart comparing Sep 2025 with Sep 2026. UnitedHealthcare: 35.3% to 41.0%; Aetna/CVS: 26.9% to 28.7%; Highmark/BCBS: 22.5% to 10.4%; Humana: 7.7% to 9.2%; Centene/Wellcare: 2.0% to 4.7%; HCSC/BCBS: 3.9% to 2.6%.Sep 2025Sep 2026UHC 35.3%41.0%Aetna 26.9%28.7%Blue Cross 22.5%10.4%Humana 7.7%9.2%Centene 2.0%4.7%Blue Cross 3.9%2.6%
View the data table
Carrier share, Sep 2025 to Sep 2026: Sep 2025 and Sep 2026
NameSep 2025Sep 2026Change
UnitedHealthcare35.3%41.0%+5.7 pts
Aetna/CVS26.9%28.7%+1.8 pts
Highmark/BCBS22.5%10.4%−12.1 pts
Humana7.7%9.2%+1.5 pts
Centene/Wellcare2.0%4.7%+2.6 pts
HCSC/BCBS3.9%2.6%−1.3 pts

Contract file · Sep 2026. Employer group plans included.

Carrier share of Medicare Advantage members with a carrier label, Delaware, September 2026
CarrierShare, Sep 2026Share, Sep 2025ChangeMembers
UnitedHealthcare41.0%35.3%+5.7 pts34,134
Aetna/CVS28.7%26.9%+1.8 pts23,891
Highmark/BCBS10.4%22.5%−12.1 pts8,659
Humana9.2%7.7%+1.5 pts7,682
Centene/Wellcare4.7%2.0%+2.6 pts3,887
HCSC/BCBS2.6%3.9%−1.3 pts2,185
Independence/BCBS1.6%0.6%+0.9 pts1,320
Devoted Health0.8%––655
CareFirst/BCBS0.5%0.5%0.0 pts425
Elevance/Anthem0.3%0.3%0.0 pts263
Horizon/BCBS0.1%0.0%0.0 pts54
All other carriers0.0%––40

Insurer not assigned in CMS data: 1.5% of all members in Sep 2026, 1.8% 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 Delaware

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 Delaware by individual Medicare Advantage members, September 2026
CountyMembers12-month changeLeading carrierLeader's share
New Castle32,700+2.9%UnitedHealthcare32.3%
Sussex21,739+3.4%UnitedHealthcare51.5%
Kent12,664+4.3%UnitedHealthcare47.7%

Browse all counties.

Common questions

How many people have Medicare Advantage in Delaware?

Delaware had 84,844 members in September 2026, by the CMS county file (employer group plans included). Individual plans, which leave out employer group coverage, had 67,103 members in September 2026.

Is Medicare Advantage growing in Delaware?

Enrollment is up 2.7% from Sep 2025 to Sep 2026, faster than the national 2.0%. Among individual plans, which leave out employer group coverage, enrollment is up 3.3% in the 12 months to September 2026.

Which carrier has the most Medicare Advantage members in Delaware?

UnitedHealthcare leads with 41.0% of members who have a carrier label (contract file, September 2026). UnitedHealthcare and Humana together hold 50.3%, up 7.2 points from Sep 2025. Shares leave out members whose contract has no carrier label: 1.5% of members.

Cite and download

Cite this page

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

Download Delaware 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