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Maryland Medicare, by the Numbers

The data layer behind our Maryland guide and all 60 city pages, in one place: CMS enrollment, Census demographics, and federal shortage designations, county by county.

Plans we accept in Maryland covering ~88.7% of Maryland's Medicare beneficiaries
  • Original Medicare
  • UnitedHealthcare ~26% of MA members
  • Humana ~20% of MA members
  • Aetna ~12% of MA members

Coverage data 2023. Plan networks change - we confirm exactly what your plan covers before any work begins.

1,175,939Medicare beneficiaries statewide (2025)
25.3%chose Medicare Advantage plans
156,913dual-eligible for Medicare and Maryland Medical Assistance
263,213Marylanders 65+ live alone
243 minmedian ER visit statewide (CMS)
56federal primary-care shortage designations

Medicare Enrollment by County

Counties covered by our city pages (24 county-equivalents, 1,175,939 beneficiaries). Each links to its anchor city page.

County Medicare beneficiaries Medicare Advantage share Dual-eligible Residents 65+ Shortage designations
Montgomery County 194,919 23.2% 23,079 175,080 5
Baltimore County 172,866 26.2% 22,976 150,859 3
Prince George's County 152,516 32.3% 19,487 138,054 4
Anne Arundel County 107,973 20.6% 9,206 91,932 1
Baltimore city 103,071 37.3% 31,357 86,161 19
Howard County 57,628 20.3% 6,047 49,360 0
Harford County 55,933 24.8% 5,176 44,548 1
Frederick County 52,499 20.7% 4,772 42,039 2
Carroll County 37,730 20.3% 2,905 30,667 1
Washington County 33,887 25% 5,308 27,598 3
Charles County 28,788 25.8% 3,232 22,108 1
Wicomico County 21,933 26.4% 3,762 16,868 2
Cecil County 21,790 21.7% 2,720 17,411 2
St. Mary's County 19,820 18.1% 2,309 15,711 1
Calvert County 19,018 15.9% 1,615 14,914 1
Allegany County 17,350 17.8% 3,380 14,200 2
Worcester County 17,023 25.2% 1,639 15,019 1
Queen Anne's County 12,859 17.3% 883 10,311 1
Talbot County 12,314 15.6% 1,106 11,060 0
Dorchester County 8,939 25.6% 1,720 7,354 1
Garrett County 7,741 23.2% 1,152 6,790 2
Caroline County 7,464 23.1% 1,244 5,719 2
Kent County 6,414 17.4% 680 5,178 1
Somerset County 5,464 29.2% 1,161 4,278 1

Statewide, 25.3% of beneficiaries chose Medicare Advantage in 2025, a lower share than most states, so Medigap timing and Part B billing questions come up constantly. Counties above that line see more prior authorizations and more denials worth appealing. Maryland is one of a handful of states with a Medigap birthday rule: for the 30 days starting on your birthday each year, you can switch to a plan with equal or lesser benefits, from any insurer, with no medical underwriting (effective July 1, 2023), and the state also requires insurers that sell Plan A to people 65+ to offer it to under-65 disabled beneficiaries on a guaranteed-issue basis. About 9% of Maryland seniors live below the poverty line, the group most likely to qualify for unclaimed help: the SPDAP drug-premium subsidy, federal Extra Help, and the Medicare Savings Programs, which the Maryland Department of Health runs with income and asset limits. For the full rundown, sources included, see our Maryland patient advocacy hub.

The Numbers Are the Backdrop. The Help Is the Point.

One dedicated advocate for the bills, appeals, appointments, and paperwork, serving every Maryland county and Baltimore City virtually, usually at $0 with Medicare.

Or start from your city: every Maryland city we serve.

Sources: CMS Medicare Monthly Enrollment (2025); US Census Bureau ACS 2023 5-year; CMS Care Compare Timely & Effective Care (median ER minutes, period ending 09/30/2025); HRSA Health Professional Shortage Area designation file. Data retrieved 2026-08-20. Understood Care is an independent private advocacy service, not a government agency.