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Medicare Advantage Enrollment Tracker · Maryland

Medicare Advantage Enrollment in Maryland

Maryland had 298,753 Medicare Advantage members in September 2026, by the CMS county file, which includes employer group plans. That is up 0.3% from Sep 2025, slower than the national 2.0%. Maryland ranks 31st by members and holds 0.8% of the national total.

Kaiser leads with 26.1% of members who have a carrier label (contract file, September 2026). UnitedHealthcare led a year earlier. 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.

Maryland at a glance

Medicare Advantage members

298,753

Maryland members by month: from 226K in Jan 2023 to 299K in Sep 2026

County file · Sep 2026. Includes employer group plans. Rank: 31.

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

+0.3%

up 0.3 percent vs Sep 2025

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

Share of national total

0.8%

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

Individual plan members

212,359

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

Kaiser

26.1% of members with a carrier label. Contract file · Sep 2026.

Maryland members by month

Medicare Advantage members in Maryland

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 MarylandLine chart, January 2023 to September 2026. Maryland: 299K in September 2026. Shaded bands mark months with no data.220K240K260K280K300K2023202420252026Maryland299K
Medicare Advantage members in MarylandLine chart, January 2023 to September 2026. Maryland: 299K in September 2026. Shaded bands mark months with no data.220K240K260K280K300K20232025Maryland299K
  • Maryland
  • Shaded: no data that month
View the data table
Medicare Advantage members in Maryland: values by month
MonthMaryland
Sep 2026299K
Aug 2026298K
Jul 2026298K
Jun 2026298K
May 2026296K
Apr 2026295K
Mar 2026293K
Feb 2026289K
Jan 2026271K
Dec 2025299K
Nov 2025299K
Oct 2025299K
Sep 2025298K
Aug 2025298K
Jul 2025297K
Jun 2025297K
May 2025295K
Apr 2025295K
Mar 2025294K
Feb 2025292K
Jan 2025285K
Dec 2024279K
Nov 2024279K
Oct 2024278K
Sep 2024277K
Aug 2024276K
Jul 2024274K
Jun 2024273K
May 2024272K
Apr 2024271K
Mar 2024269K
Feb 2024268K
Jan 2024265K
Dec 2023–
Nov 2023249K
Oct 2023247K
Sep 2023246K
Aug 2023244K
Jul 2023–
Jun 2023242K
May 2023241K
Apr 2023239K
Mar 2023238K
Feb 2023236K
Jan 2023226K

County file · Sep 2026. Employer group plans included.

Maryland 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.
Maryland and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Maryland: 132.1 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.1001101201301402023202420252026Maryland132.1National117.8
Maryland and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Maryland: 132.1 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.10011012013014020232025Maryland132.1National117.8
  • Maryland
  • National (same jurisdictions each month)
  • Shaded: no data that month
View the data table
Maryland and the nation, Jan 2023 = 100: values by month
MonthMarylandNational (same jurisdictions each month)
Sep 2026132.1117.8
Aug 2026132117.8
Jul 2026131.9117.5
Jun 2026131.7117.4
May 2026131.1117.2
Apr 2026130.6116.9
Mar 2026129.7116.7
Feb 2026127.8116.3
Jan 2026119.7114.7
Dec 2025132.1115.9
Nov 2025132.1115.9
Oct 2025132.1115.7
Sep 2025131.8115.5
Aug 2025131.8115.3
Jul 2025131.4115
Jun 2025131.2114.8
May 2025130.4114.4
Apr 2025130.6114.2
Mar 2025130.2113.8
Feb 2025129.2113.4
Jan 2025125.9111.9
Dec 2024123.4112
Nov 2024123.3112
Oct 2024122.9111.7
Sep 2024122.5111.5
Aug 2024122111.2
Jul 2024121.2110.9
Jun 2024120.9110.7
May 2024120.3110.5
Apr 2024119.7110
Mar 2024118.9109.7
Feb 2024118.3109.3
Jan 2024117.3108.7
Dec 2023––
Nov 2023110.1105.9
Oct 2023109.3105.6
Sep 2023108.6105.2
Aug 2023108.1104.9
Jul 2023––
Jun 2023106.9104.1
May 2023106.4103.8
Apr 2023105.7103.4
Mar 2023105.2103
Feb 2023104.6102.2
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 Maryland

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.

Kaiser leads with 26.1% of members who have a carrier label (contract file, September 2026). UnitedHealthcare led a year earlier.

CareFirst/BCBS gained 8.3 points in 12 months; most of that change came in January 2026.

Humana gained 6.1 points in 12 months; most of that change came in January 2026.

UnitedHealthcare and Humana together hold 29.9%, down 7.0 points from 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. Kaiser: 25.1% to 26.1%; CareFirst/BCBS: 9.8% to 18.1%; Humana: 11.2% to 17.3%; UnitedHealthcare: 25.7% to 12.6%; Aetna/CVS: 15.7% to 11.6%; Johns Hopkins Healthcare: 4.5% to 5.0%.Sep 2025Sep 2026Kaiser 25.1%26.1% KaiserCareFirst/BCBS 9.8%18.1% CareFirst/BCBSHumana 11.2%17.3% HumanaUnitedHealthcare 25.7%12.6% UnitedHealthcareAetna/CVS 15.7%11.6% Aetna/CVSJohns 4.5%5.0% Johns
Carrier share, Sep 2025 to Sep 2026Slope chart comparing Sep 2025 with Sep 2026. Kaiser: 25.1% to 26.1%; CareFirst/BCBS: 9.8% to 18.1%; Humana: 11.2% to 17.3%; UnitedHealthcare: 25.7% to 12.6%; Aetna/CVS: 15.7% to 11.6%; Johns Hopkins Healthcare: 4.5% to 5.0%.Sep 2025Sep 2026Kaiser 25.1%26.1%Blue Cross 9.8%18.1%Humana 11.2%17.3%UHC 25.7%12.6%Aetna 15.7%11.6%Johns 4.5%5.0%
View the data table
Carrier share, Sep 2025 to Sep 2026: Sep 2025 and Sep 2026
NameSep 2025Sep 2026Change
Kaiser25.1%26.1%+1.0 pts
CareFirst/BCBS9.8%18.1%+8.3 pts
Humana11.2%17.3%+6.1 pts
UnitedHealthcare25.7%12.6%−13.1 pts
Aetna/CVS15.7%11.6%−4.0 pts
Johns Hopkins Healthcare4.5%5.0%+0.5 pts

Contract file · Sep 2026. Employer group plans included.

Carrier share of Medicare Advantage members with a carrier label, Maryland, September 2026
CarrierShare, Sep 2026Share, Sep 2025ChangeMembers
Kaiser26.1%25.1%+1.0 pts75,706
CareFirst/BCBS18.1%9.8%+8.3 pts52,380
Humana17.3%11.2%+6.1 pts50,136
UnitedHealthcare12.6%25.7%−13.1 pts36,578
Aetna/CVS11.6%15.7%−4.0 pts33,785
Johns Hopkins Healthcare5.0%4.5%+0.5 pts14,393
LifeBridge Health4.8%3.3%+1.5 pts14,040
HCSC/BCBS3.5%3.6%−0.1 pts10,225
Elevance/Anthem0.4%0.5%0.0 pts1,261
All other carriers0.2%––696
ISNP Holdings0.2%0.2%0.0 pts527
SNP Holdings0.1%0.2%−0.1 pts334

Insurer not assigned in CMS data: 2.4% of all members in Sep 2026, 2.6% 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 Maryland

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 Maryland by individual Medicare Advantage members, September 2026
CountyMembers12-month changeLeading carrierLeader's share
Prince George's35,847−1.3%Kaiser46.7%
Montgomery35,297−1.5%Kaiser51.5%
Baltimore31,479+2.3%Kaiser24.0%
Baltimore City31,224−0.5%Kaiser20.2%
Anne Arundel14,960−2.3%CareFirst/BCBS26.8%
Howard8,267−0.9%CareFirst/BCBS32.1%
Frederick7,472+1.5%Humana36.1%
Harford7,225+8.5%CareFirst/BCBS21.9%
Washington6,391−1.0%Humana61.9%
Charles4,861+1.2%Humana40.7%

Browse all counties.

Common questions

How many people have Medicare Advantage in Maryland?

Maryland had 298,753 members in September 2026, by the CMS county file (employer group plans included). Individual plans, which leave out employer group coverage, had 212,359 members in September 2026.

Is Medicare Advantage growing in Maryland?

Enrollment is up 0.3% 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 Maryland?

Kaiser leads with 26.1% of members who have a carrier label (contract file, September 2026). UnitedHealthcare led a year earlier. UnitedHealthcare and Humana together hold 29.9%, down 7.0 points from Sep 2025. Shares leave out members whose contract has no carrier label: 2.4% of members.

Cite and download

Cite this page

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

Download Maryland 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