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Medicare Advantage Enrollment Tracker

Kaiser Permanente Medicare Advantage Enrollment

In September 2026, Kaiser Permanente had 2,048,427 Medicare Advantage members, up 68,015 from September 2025. That is 5.7% of members with a carrier label, fourth among carriers. Its share was unchanged since September 2025.

Data as ofCMS contract file

  • These totals include employer and union group plans.
    Why this matters

    Carrier shares: all Medicare Advantage contracts, including employer group, from the CMS contract file. Share is of members with a carrier label. This file and the state file give different totals, so these shares do not apply to state or county member counts.

  • Some months are missing from the source.
    Why this matters

    Missing months: July 2023 and December 2023 are absent from the state and county file; July 2023 is absent from the contract file. Lines break at a gap. Nothing is filled or averaged across it. Year-over-year changes compare the same calendar month, so July 2023 and December 2023 cannot be compared.

  • Some contracts have no carrier name.
    Why this matters

    Insurer not assigned in CMS data: 0.6% of members in September 2026 (225,918), against 10.7% in January 2023. These are mostly retired contracts with no carrier label. Shares divide by members with a label so old and new months compare. When the unassigned bucket is above 3% in either month, treat share changes as rough.

  • Shares jump each January. Compare same months.
    Why this matters

    Counts and shares step at each January, when plan-year contracts and annual elections take effect. A 12-month change is mostly one January step plus drift. CMS posts January counts late, so compare November with February or March, not January alone.

By Senior Deal Club Standards Desk. Editorial policy. Methodology. Senior Deal Club is not affiliated with Medicare or any government agency. This page is educational. It counts members. It does not rate plans.

Kaiser Permanente led 2 areas and held 20% or more in 2 more. An area is a state or DC.

Shares are of members whose contract has a carrier label, from the CMS contract file. The file includes employer group plans. Source: CMS, September 2026.

Kaiser Permanente at a glance

Share of labelled members

5.7%

no change vs September 2025

September 2026, rank 4 among carriers

Members

2,048,427

September 2026, contract file

States led

2

Areas where Kaiser Permanente had the most labelled members, September 2026

National share against nearby carriers

Kaiser Permanente and the carriers ranked just above and below it, January 2023 to September 2026.

Kaiser Permanente share of members

Percent of members with a carrier label, monthly

Contract file · September 2026
CMS contract file. Includes employer group plans. Share divides by members with a carrier label.
Kaiser Permanente share of membersLine chart, January 2023 to September 2026. Kaiser Permanente: 5.7% in September 2026. Aetna/CVS: 11.6% in September 2026. Elevance/Anthem/BCBS: 5.2% in September 2026. Humana: 20.0% in September 2026. Shaded bands mark months with no data.5%10%15%20%25%2023202420252026ABHumana20.0%Aetna/CVS11.6%Kaiser Permanente5.7%Elevance5.2%
Kaiser Permanente share of membersLine chart, January 2023 to September 2026. Kaiser Permanente: 5.7% in September 2026. Aetna/CVS: 11.6% in September 2026. Elevance/Anthem/BCBS: 5.2% in September 2026. Humana: 20.0% in September 2026. Shaded bands mark months with no data.5%10%15%20%25%20232025ABHumana20.0%Aetna11.6%Kaiser5.7%Elevance5.2%
  • Kaiser Permanente
  • Aetna/CVS
  • Elevance/Anthem/BCBS
  • Humana
  • Shaded: no data that month
  1. Note A: July 2023: No contract-file data for July 2023.
  2. Note B: January 2026: January step: plan-year contract changes move members between carriers. Shares jump in this month.
View the data table
Kaiser Permanente share of members: values by month
MonthKaiser PermanenteAetna/CVSElevance/Anthem/BCBSHumana
Sep 20265.7%11.6%5.2%20.0%
Aug 20265.7%11.5%5.2%20.0%
Jul 20265.7%11.5%5.2%20.0%
Jun 20265.7%11.5%5.2%20.0%
May 20265.7%11.5%5.2%20.0%
Apr 20265.7%11.5%5.2%20.0%
Mar 20265.7%11.5%5.3%19.9%
Feb 20265.7%11.5%5.3%19.8%
Jan 20265.7%11.6%5.4%19.5%
Dec 20255.7%12.0%6.3%16.7%
Nov 20255.7%12.1%6.3%16.7%
Oct 20255.7%12.0%6.3%16.7%
Sep 20255.7%12.0%6.4%16.7%
Aug 20255.7%12.1%6.4%16.7%
Jul 20255.7%12.0%6.4%16.7%
Jun 20255.7%12.0%6.4%16.7%
May 20255.7%12.1%6.4%16.8%
Apr 20255.7%12.1%6.5%16.8%
Mar 20255.7%12.1%6.5%16.9%
Feb 20255.8%12.1%6.6%17.0%
Jan 20255.8%12.0%6.6%17.0%
Dec 20245.9%13.5%6.2%18.9%
Nov 20245.9%13.5%6.2%18.9%
Oct 20245.9%13.5%6.2%18.9%
Sep 20245.9%13.4%6.2%18.9%
Aug 20246.0%13.3%6.2%18.9%
Jul 20246.0%13.3%6.2%18.9%
Jun 20246.0%13.2%6.2%18.9%
May 20246.0%13.1%6.2%18.9%
Apr 20246.0%12.9%6.2%18.9%
Mar 20246.0%12.8%6.2%18.9%
Feb 20246.0%12.7%6.2%18.9%
Jan 20246.0%12.3%6.3%18.9%
Dec 20236.5%11.6%6.7%19.7%
Nov 20236.5%11.6%6.7%19.7%
Oct 20236.5%11.6%6.8%19.7%
Sep 20236.5%11.6%6.8%19.6%
Aug 20236.5%11.6%6.8%19.5%
Jul 2023––––
Jun 20236.5%11.6%6.9%19.4%
May 20236.5%11.7%6.9%19.4%
Apr 20236.6%11.7%6.9%19.3%
Mar 20236.6%11.7%6.9%19.2%
Feb 20236.6%11.8%7.0%19.1%
Jan 20236.7%11.3%7.1%19.0%

CMS contract file, September 2026. Share of members with a carrier label. Includes employer group plans.

Where Kaiser Permanente has members

States where Kaiser Permanente has 1,000 or more members, largest first. Share is of that state's labelled members in September 2026. Change is in percentage points since September 2025. States where a carrier is small may be missing: the data keeps each state's ten largest carriers and any carrier above 1%. A contract that serves several states carries one carrier label, so a carrier can show members in a state where it is not a local plan.

Leads: California, Maryland. Holds 20% or more: Colorado, Hawaii.

Kaiser Permanente members by state, September 2026
StateMembersShareRankChange since September 2025Note
California1,528,01041.5%1up 0.6 percentage pointsLeads
Washington129,00116.4%3down 0.5 percentage points
Colorado114,98220.4%3down 0.3 percentage pointsStrong
Oregon79,98315.4%2up 0.5 percentage points
Maryland75,70626.1%1up 1.0 percentage pointsLeads
Georgia42,4173.7%6no change
Hawaii37,35822.1%3up 0.2 percentage pointsStrong
Virginia33,7974.9%5up 0.1 percentage points
District of Columbia6,55619.5%2down 0.5 percentage points

Gained or lost the lead

Leader by labelled members in each state, September 2025 against September 2026.

Kaiser Permanente took the lead from UnitedHealthcare in Maryland (from UnitedHealthcare).

Questions about Kaiser Permanente

How many people are in Kaiser Permanente Medicare Advantage plans?

2,048,427 members in September 2026, from the CMS contract file. The count includes employer group plans and is not limited to plans anyone can buy.

Is Kaiser Permanente gaining or losing Medicare Advantage members?

Its share of labelled members was unchanged between September 2025 and September 2026, from 5.7% to 5.7%. Members rose from 1,980,412 to 2,048,427. The data does not show why.

Where does Kaiser Permanente have the most members?

California (1,528,010, 41.5% of that state's labelled members), Washington (129,001, 16.4% of that state's labelled members), and Colorado (114,982, 20.4% of that state's labelled members) in September 2026.

Does this page show Kaiser Permanente plan prices or benefits?

No. It counts members and shares. For plan details, use the carrier or Medicare.gov. Senior Deal Club is not affiliated with Medicare or any government agency. This page is educational. It counts members. It does not rate plans.

Cite and download

Cite this page

Senior Deal Club Standards Desk. Kaiser Permanente Medicare Advantage Enrollment. Data as of September 2026. Source: CMS Medicare Advantage monthly enrollment, contract file. https://www.seniordealclub.com/medicare-advantage/enrollment/carriers/kaiser-permanente

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