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Medicare Advantage Enrollment Tracker · Oregon

Medicare Advantage Enrollment in Oregon

Oregon had 525,060 Medicare Advantage members in September 2026, by the CMS county file, which includes employer group plans. That is up 0.2% from Sep 2025, slower than the national 2.0%. Oregon ranks 27th by members and holds 1.5% of the national total.

UnitedHealthcare leads with 30.2% of members who have a carrier label (contract file, September 2026). Among individual plans, which leave out employer group coverage, enrollment is up 1.0% 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.

Oregon at a glance

Medicare Advantage members

525,060

Oregon members by month: from 483K in Jan 2023 to 525K in Sep 2026

County file · Sep 2026. Includes employer group plans. Rank: 27.

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

+0.2%

up 0.2 percent vs Sep 2025

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

Share of national total

1.5%

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

Individual plan members

467,801

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

UnitedHealthcare

30.2% of members with a carrier label. Contract file · Sep 2026.

Oregon members by month

Medicare Advantage members in Oregon

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 OregonLine chart, January 2023 to September 2026. Oregon: 525K in September 2026. Shaded bands mark months with no data.480K500K520K540K2023202420252026Oregon525K
Medicare Advantage members in OregonLine chart, January 2023 to September 2026. Oregon: 525K in September 2026. Shaded bands mark months with no data.480K500K520K540K20232025Oregon525K
  • Oregon
  • Shaded: no data that month
View the data table
Medicare Advantage members in Oregon: values by month
MonthOregon
Sep 2026525K
Aug 2026525K
Jul 2026525K
Jun 2026525K
May 2026525K
Apr 2026524K
Mar 2026524K
Feb 2026522K
Jan 2026516K
Dec 2025524K
Nov 2025525K
Oct 2025524K
Sep 2025524K
Aug 2025524K
Jul 2025523K
Jun 2025523K
May 2025523K
Apr 2025523K
Mar 2025523K
Feb 2025522K
Jan 2025516K
Dec 2024524K
Nov 2024524K
Oct 2024521K
Sep 2024520K
Aug 2024519K
Jul 2024519K
Jun 2024518K
May 2024516K
Apr 2024515K
Mar 2024514K
Feb 2024514K
Jan 2024511K
Dec 2023–
Nov 2023501K
Oct 2023500K
Sep 2023499K
Aug 2023498K
Jul 2023–
Jun 2023495K
May 2023494K
Apr 2023494K
Mar 2023493K
Feb 2023492K
Jan 2023483K

County file · Sep 2026. Employer group plans included.

Oregon 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.
Oregon and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Oregon: 108.7 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.1001051101151202023202420252026National117.8Oregon108.7
Oregon and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Oregon: 108.7 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.10010511011512020232025National117.8Oregon108.7
  • Oregon
  • National (same jurisdictions each month)
  • Shaded: no data that month
View the data table
Oregon and the nation, Jan 2023 = 100: values by month
MonthOregonNational (same jurisdictions each month)
Sep 2026108.7117.8
Aug 2026108.7117.8
Jul 2026108.7117.5
Jun 2026108.7117.4
May 2026108.7117.2
Apr 2026108.5116.9
Mar 2026108.5116.7
Feb 2026108.1116.3
Jan 2026106.9114.7
Dec 2025108.5115.9
Nov 2025108.7115.9
Oct 2025108.6115.7
Sep 2025108.5115.5
Aug 2025108.4115.3
Jul 2025108.3115
Jun 2025108.3114.8
May 2025108.2114.4
Apr 2025108.3114.2
Mar 2025108.4113.8
Feb 2025108.2113.4
Jan 2025106.9111.9
Dec 2024108.5112
Nov 2024108.5112
Oct 2024107.8111.7
Sep 2024107.6111.5
Aug 2024107.5111.2
Jul 2024107.4110.9
Jun 2024107.2110.7
May 2024106.9110.5
Apr 2024106.7110
Mar 2024106.5109.7
Feb 2024106.4109.3
Jan 2024105.9108.7
Dec 2023––
Nov 2023103.8105.9
Oct 2023103.5105.6
Sep 2023103.3105.2
Aug 2023103.1104.9
Jul 2023––
Jun 2023102.6104.1
May 2023102.4103.8
Apr 2023102.2103.4
Mar 2023102103
Feb 2023101.8102.2
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 Oregon

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.

UnitedHealthcare leads with 30.2% of members who have a carrier label (contract file, September 2026).

UnitedHealthcare gained 3.4 points in 12 months; most of that change came in January 2026.

Providence St Joseph Health lost 2.1 points in 12 months; most of that change came in January 2026.

UnitedHealthcare and Humana together hold 33.6%, up 4.0 points from Sep 2025.

The market is more 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. UnitedHealthcare: 26.8% to 30.2%; Kaiser: 14.9% to 15.4%; Providence St Joseph Health: 12.8% to 10.7%; Regence/BCBS: 8.8% to 8.5%; PacificSource: 7.7% to 7.0%; Centene/Wellcare: 7.7% to 6.9%.Sep 2025Sep 2026UnitedHealthcare 26.8%30.2% UnitedHealthcareKaiser 14.9%15.4% KaiserProvidence 12.8%10.7% ProvidenceRegence/BCBS 8.8%8.5% Regence/BCBSPacificSource 7.7%7.0% PacificSourceCentene/Wellcare 7.7%6.9% Centene/Wellcare
Carrier share, Sep 2025 to Sep 2026Slope chart comparing Sep 2025 with Sep 2026. UnitedHealthcare: 26.8% to 30.2%; Kaiser: 14.9% to 15.4%; Providence St Joseph Health: 12.8% to 10.7%; Regence/BCBS: 8.8% to 8.5%; PacificSource: 7.7% to 7.0%; Centene/Wellcare: 7.7% to 6.9%.Sep 2025Sep 2026UHC 26.8%30.2%Kaiser 14.9%15.4%Providence 12.8%10.7%Blue Cross 8.8%8.5%PacificSource 7.7%7.0%Centene 7.7%6.9%
View the data table
Carrier share, Sep 2025 to Sep 2026: Sep 2025 and Sep 2026
NameSep 2025Sep 2026Change
UnitedHealthcare26.8%30.2%+3.4 pts
Kaiser14.9%15.4%+0.5 pts
Providence St Joseph Health12.8%10.7%−2.1 pts
Regence/BCBS8.8%8.5%−0.4 pts
PacificSource7.7%7.0%−0.6 pts
Centene/Wellcare7.7%6.9%−0.8 pts

Contract file · Sep 2026. Employer group plans included.

Carrier share of Medicare Advantage members with a carrier label, Oregon, September 2026
CarrierShare, Sep 2026Share, Sep 2025ChangeMembers
UnitedHealthcare30.2%26.8%+3.4 pts157,004
Kaiser15.4%14.9%+0.5 pts79,983
Providence St Joseph Health10.7%12.8%−2.1 pts55,502
Regence/BCBS8.5%8.8%−0.4 pts44,148
PacificSource7.0%7.7%−0.6 pts36,644
Centene/Wellcare6.9%7.7%−0.8 pts36,165
ATRIO Health Plans6.5%7.5%−1.0 pts33,614
Devoted Health3.7%1.1%+2.6 pts19,274
Aetna/CVS3.7%2.9%+0.8 pts19,233
Humana3.5%2.8%+0.7 pts18,142
CareOregon2.5%3.1%−0.6 pts13,005
All other carriers1.3%––6,559
Samaritan Health Services0.3%2.7%−2.4 pts1,371

Insurer not assigned in CMS data: 0.5% of all members in Sep 2026, 0.7% 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 Oregon

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 Oregon by individual Medicare Advantage members, September 2026
CountyMembers12-month changeLeading carrierLeader's share
Multnomah80,166+0.5%UnitedHealthcare26.7%
Washington61,112+2.1%UnitedHealthcare32.7%
Lane57,812+0.7%UnitedHealthcare52.6%
Clackamas57,217+1.6%UnitedHealthcare31.7%
Marion41,106+1.2%UnitedHealthcare53.3%
Jackson28,870+2.1%Regence/BCBS27.1%
Linn18,328−0.1%Centene/Wellcare28.2%
Deschutes18,196−2.8%PacificSource100.0%
Douglas17,394+1.2%ATRIO Health Plans70.8%
Josephine15,733+2.4%Regence/BCBS28.5%

6 of 36 counties have no individual plan row. Those read "not reported", not zero. Browse all counties.

Common questions

How many people have Medicare Advantage in Oregon?

Oregon had 525,060 members in September 2026, by the CMS county file (employer group plans included). Individual plans, which leave out employer group coverage, had 467,801 members in September 2026.

Is Medicare Advantage growing in Oregon?

Enrollment is up 0.2% from Sep 2025 to Sep 2026, slower than the national 2.0%. Among individual plans, which leave out employer group coverage, enrollment is up 1.0% in the 12 months to September 2026.

Which carrier has the most Medicare Advantage members in Oregon?

UnitedHealthcare leads with 30.2% of members who have a carrier label (contract file, September 2026). UnitedHealthcare and Humana together hold 33.6%, up 4.0 points from Sep 2025. Shares leave out members whose contract has no carrier label: 0.5% of members.

Cite and download

Cite this page

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

Download Oregon 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