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CMS Medicare enrollment · April 2026

Colorado Medicare Enrollment

State and county enrollment from CMS, including Original Medicare, Medicare Advantage and Other Health Plans, and Part D coverage.

Informational only. These enrollment counts do not compare plans or provide medical, financial, or enrollment advice.

Total Medicare enrollment
1.1M

1,084,047

Original Medicare
516.4K

516,371 beneficiaries

MA & Other share
52.4%

CMS combined delivery-system measure

Part D coverage
81.1%

879,176 beneficiaries

County enrollment

65 CMS county rows for Colorado. Unavailable values remain marked as not reported rather than estimated.

CountyTotalOriginal MedicareMA & OtherMA & Other sharePart D share
Adams County71,76525,38346,38264.6%83.1%
Alamosa County3,4191,8411,57846.2%79.3%
Arapahoe County108,18545,87262,31357.6%82%
Archuleta County4,8123,3461,46630.5%76.7%
Baca County947860879.2%81.9%
Bent County1,17561156448%78.3%
Boulder County62,73232,24030,49248.6%85.3%
Broomfield County13,9885,8398,14958.3%85.2%
Chaffee County6,2243,9502,27436.5%81.3%
Cheyenne County4143625212.6%70.3%
Clear Creek County1,9028271,07556.5%81.3%
Conejos County2,0609761,08452.6%80.2%
Costilla County1,39962077955.7%79.3%
Crowley County91642049654.1%78.1%
Custer County2,1311,19693543.9%75.8%
Delta County10,6665,6645,00246.9%77.5%
Denver County97,51238,91658,59660.1%85.4%
Dolores County61743018730.3%71.2%
Douglas County65,80032,07033,73051.3%82.5%
Eagle County8,0356,6321,40317.5%77.4%
El Paso County130,53363,84066,69351.1%70.5%
Elbert County6,0393,0313,00849.8%77.2%
Fremont County13,6395,5098,13059.6%81.3%
Garfield County10,9349,4451,48913.6%77%
Gilpin County1,29360868553%78.3%
Grand County3,2362,0831,15335.6%78.6%
Gunnison County2,9102,30660420.8%79.8%
Hinsdale County2461786827.6%78.5%
Huerfano County2,6971,2671,43053%79.4%
Jackson County3492519828.1%73.6%
Jefferson County124,11447,13376,98162%84.7%
Kiowa County3622936919.1%78.2%
Kit Carson County1,6451,42721813.3%78.8%
La Plata County13,6029,4084,19430.8%78.2%
Lake County1,16475041435.6%75.3%
Larimer County77,54040,46737,07347.8%83.8%
Las Animas County4,5912,3322,25949.2%75.9%
Lincoln County1,05672732931.2%76.5%
Logan County4,6172,8331,78438.6%84%
Mesa County41,58022,44319,13746%79.4%
Mineral County32321011335%79.3%
Moffat County2,7052,35335213%71.1%
Montezuma County7,8865,2982,58832.8%76.3%
Montrose County13,1497,7065,44341.4%79.6%
Morgan County5,7513,4612,29039.8%79.4%
Otero County4,8401,8612,97961.5%82.7%
Ouray County1,7351,30443124.8%78.9%
Park County4,5172,4822,03545.1%75.3%
Phillips County1,08590218316.9%84.1%
Pitkin County3,4013,1013008.8%80%
Prowers County2,6322,15647618.1%77.5%
Pueblo County40,90015,50925,39162.1%83.3%
Rio Blanco County1,5141,04946530.7%77.3%
Rio Grande County3,4841,9971,48742.7%80.7%
Routt County5,1874,36382415.9%78.7%
Saguache County1,71195076144.5%75.2%
San Juan County1761443218.2%71%
San Miguel County1,3421,03231023.1%74.6%
Sedgwick County7566748210.8%77%
Summit County4,5043,3851,11924.8%79.4%
Teller County7,6723,5454,12753.8%76.4%
UnknownNot reportedNot reportedNot reportedNot reportedNot reported
Washington County1,16582134429.5%82.8%
Weld County58,74625,94032,80655.8%83.2%
Yuma County2,0181,74127713.7%84%

Source and interpretation

CMS Medicare Monthly Enrollment, April 2026, published 2026-07-23. “MA & Other” retains the official combined CMS field label.

  • CMS suppresses some small counts with an asterisk; suppressed values remain null in this snapshot.
  • Medicare Advantage and Other Health Plans is the CMS-published combined measure and is not limited to Medicare Advantage alone.
  • Enrollment counts describe a reporting month and do not compare plan benefits, provider networks, quality, or personal costs.

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