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CMS Medicare enrollment · April 2026

Montana 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
271.4K

271,396

Original Medicare
190.3K

190,330 beneficiaries

MA & Other share
29.9%

CMS combined delivery-system measure

Part D coverage
76%

206,392 beneficiaries

County enrollment

57 CMS county rows for Montana. Unavailable values remain marked as not reported rather than estimated.

CountyTotalOriginal MedicareMA & OtherMA & Other sharePart D share
Beaverhead County2,7182,10461422.6%77.7%
Big Horn County2,0751,40966632.1%60%
Blaine County1,2701,240302.4%62%
Broadwater County1,9171,33358430.5%73.2%
Carbon County3,5562,4271,12931.7%77.9%
Carter County362Not reportedNot reportedNot reported73.8%
Cascade County19,64512,1207,52538.3%72.1%
Chouteau County1,5081,10340526.9%76.6%
Custer County2,9292,51441514.2%76%
Daniels County471449224.7%77.9%
Dawson County2,2392,204351.6%79.9%
Deer Lodge County3,0282,23179726.3%78.7%
Fallon County658621375.6%80.2%
Fergus County3,4862,2801,20634.6%76%
Flathead County28,93618,87210,06434.8%77.5%
Gallatin County20,23514,7315,50427.2%77.8%
Garfield County310Not reportedNot reportedNot reported72.9%
Glacier County2,2821,79448821.4%54.7%
Golden Valley County30817013844.8%76.9%
Granite County1,01976625324.8%71.6%
Hill County3,3763,1092677.9%75.9%
Jefferson County3,9362,8011,13528.8%74.3%
Judith Basin County69844725136%75.5%
Lake County9,0126,4372,57528.6%71.9%
Lewis And Clark County18,53813,0215,51729.8%74.5%
Liberty County50840810019.7%79.5%
Lincoln County8,3604,8763,48441.7%73.6%
Madison County2,8802,24563522%76.5%
Mccone County482450326.6%78.2%
Meagher County64152211918.6%72.7%
Mineral County1,7911,19060133.6%73.5%
Missoula County26,12619,3266,80026%79.1%
Musselshell County1,7311,10662536.1%76.2%
Park County4,8253,88893719.4%74.8%
Petroleum County118991916.1%75.4%
Phillips County1,1411,055867.5%72%
Pondera County1,5531,10744628.7%77.9%
Powder River County462429337.1%76.8%
Powell County1,8281,44338521.1%70.7%
Prairie County432398347.9%72.2%
Ravalli County15,60610,5655,04132.3%75.3%
Richland County2,3322,299331.4%79.8%
Roosevelt County1,7871,689985.5%73.1%
Rosebud County1,9441,46747724.5%67.2%
Sanders County5,0443,3051,73934.5%72%
Sheridan County990977131.3%80.7%
Silver Bow County8,7736,1752,59829.6%78.8%
Stillwater County2,8671,8671,00034.9%78.6%
Sweet Grass County1,11279931328.1%80.8%
Teton County1,7451,07067538.7%78%
Toole County1,07388518817.5%71.9%
Treasure County2441558936.5%83.2%
UnknownNot reportedNot reportedNot reportedNot reportedNot reported
Valley County1,9041,7691357.1%76.3%
Wheatland County64440923536.5%74.4%
Wibaux County246Not reportedNot reportedNot reported80.9%
Yellowstone County37,69523,27214,42338.3%79.2%

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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