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MA Enrollment Explorer / States / Oregon

Medicare Advantage in Oregon: enrollment, penetration and market share

525,703 people in Oregon were enrolled in Medicare Advantage in October 2026. 53.8% of the state's 977,770 eligible Medicare beneficiaries are in Medicare Advantage, −0.9 pts since October 2025. UnitedHealth Group, Inc. is the largest parent organization with 30% of reported enrollment; 20 parent organizations have 11 or more members, and the market's HHI is 1,502 (moderately concentrated). Through the 2026 Annual Election Period (December to February), reported MA enrollment in Oregon changed by −2,017 (−0.4%).

53.8%MA penetration, October 2026
526KMA enrollees
20parent organizations (11+ members)
1,502HHI, moderately concentrated
Open Oregon on the market mapMSSP ACOs in Oregon

Parent organizations in Oregon

Parent organizationMembersChangeShareShare change
UnitedHealth Group, Inc.157,122+17,85930.0%+3.4 pts
Kaiser Foundation Health Plan, Inc.80,171+2,85915.3%+0.5 pts
Providence St Joseph Health55,301−10,85410.6%−2.1 pts
Cambia Health Solutions, Inc.44,047−1,7848.4%−0.4 pts
PacificSource36,599−3,2527.0%−0.6 pts
Centene Corporation36,097−3,8176.9%−0.7 pts
ATRIO Health Plans33,611−5,2206.4%−1.0 pts
Devoted Health, Inc.19,513+13,7203.7%+2.6 pts
CVS Health Corporation19,399+4,5253.7%+0.9 pts
Humana Inc.18,169+3,5433.5%+0.7 pts
CareOregon, Inc.13,029−2,8822.5%−0.6 pts
AllCare Health, Inc.2,471−920.5%−0.02 pts
Providence Health & Services1,780+640.3%+0.01 pts
Elevance Health, Inc.1,734−510.3%−0.01 pts
Samaritan Health Services, Inc.1,364−12,3820.3%−2.4 pts
Marquis Companies I, Inc.915+1310.2%+0.02 pts
Health Care Service Corporation641−1,2100.1%−0.2 pts
California Physicians' Service609+370.1%+0.01 pts
Highmark Health587+160.1%+0.00 pts
Blue Cross Blue Shield of Michigan Mutual Ins. Co.253+5under 0.1%+0.00 pts

Change and share change are since October 2025. Shares are of reported enrollment in the CMS State/County/Contract file.

Counties

CountyMA enrolleesPenetrationLeading parent
Multnomah County91,88265.7%Kaiser Foundation Health Plan, Inc. 27%
Washington County68,77964.4%UnitedHealth Group, Inc. 31%
Clackamas County66,23266.1%UnitedHealth Group, Inc. 30%
Lane County62,08563.3%UnitedHealth Group, Inc. 52%
Marion County46,85864.7%UnitedHealth Group, Inc. 49%
Jackson County30,74249.2%Cambia Health Solutions, Inc. 26%
Deschutes County20,74938.5%PacificSource 88%
Linn County20,01761.2%Centene Corporation 26%
Douglas County18,58450.9%ATRIO Health Plans 67%
Josephine County16,81258.7%Cambia Health Solutions, Inc. 27%
Yamhill County14,87559.3%UnitedHealth Group, Inc. 47%
Polk County13,46364.8%UnitedHealth Group, Inc. 48%
Benton County10,03749.3%Cambia Health Solutions, Inc. 35%
Columbia County8,39860.9%Kaiser Foundation Health Plan, Inc. 33%
Klamath County7,59339.5%ATRIO Health Plans 91%
Lincoln County5,69731.0%Devoted Health, Inc. 84%
Coos County5,30524.1%Centene Corporation 87%
Crook County3,34440.4%PacificSource 92%
Jefferson County2,59541.7%PacificSource 94%
Malheur County2,31034.4%Humana Inc. 98%
Wasco County2,10431.3%PacificSource 91%
Hood River County1,82934.2%PacificSource 47%
Tillamook County1,21113.5%Devoted Health, Inc. 67%
Baker County86215.8%Humana Inc. 86%
Clatsop County6905.8%UnitedHealth Group, Inc. 32%
Umatilla County5713.5%UnitedHealth Group, Inc. 81%
Curry County5145.1%UnitedHealth Group, Inc. 38%
Wallowa County40214.8%Humana Inc. 89%
Morrow County37716.1%Humana Inc. 90%
Union County3304.7%UnitedHealth Group, Inc. 57%
Sherman County14725.8%PacificSource 80%
Gilliam County10516.5%Humana Inc. 86%
Grant County773.2%UnitedHealth Group, Inc. 80%
Harney County612.7%UnitedHealth Group, Inc. 100%
Lake County492.0%UnitedHealth Group, Inc. 100%
Wheeler County173.2%