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Medicare Advantage Enrollment Tracker

Medicare Advantage Enrollment by Carrier

In September 2026, UnitedHealthcare held 25.9% of Medicare Advantage members with a carrier label. Its share fell 3.6 points from September 2025. Humana held 20.0% and rose 3.3 points.

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.

Most of the change in both shares came in January 2026. Shares step each January, so read the 12-month change with that in mind.

UnitedHealthcare led 23 areas in September 2026, against about 35 a year earlier. Humana led 13, against 5. An area is a state or DC with data in both months. 15 areas changed leader.

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.

The largest carriers

Share of members with a carrier label, September 2026, against September 2025.

UnitedHealthcare

25.9%

down 3.6 percentage points vs September 2025

9,312,135 members, September 2026

Humana

20.0%

up 3.3 percentage points vs September 2025

7,175,383 members, September 2026

Aetna/CVS

11.6%

down 0.5 percentage points vs September 2025

4,156,589 members, September 2026

Carrier share over time

The five largest carriers, January 2023 to September 2026. A dashed line marks the January step. Shaded months have no data.

Share of members, largest carriers

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.
Share of members, largest carriersLine chart, January 2023 to September 2026. UnitedHealthcare: 25.9% in September 2026. Humana: 20.0% in September 2026. Aetna/CVS: 11.6% in September 2026. Kaiser Permanente: 5.7% in September 2026. Elevance/Anthem/BCBS: 5.2% in September 2026. Shaded bands mark months with no data.0%10%20%30%2023202420252026ABUnitedHealthcare25.9%Humana20.0%Aetna/CVS11.6%Kaiser Permanente5.7%Elevance5.2%
Share of members, largest carriersLine chart, January 2023 to September 2026. UnitedHealthcare: 25.9% in September 2026. Humana: 20.0% in September 2026. Aetna/CVS: 11.6% in September 2026. Kaiser Permanente: 5.7% in September 2026. Elevance/Anthem/BCBS: 5.2% in September 2026. Shaded bands mark months with no data.0%10%20%30%20232025ABUHC25.9%Humana20.0%Aetna11.6%Kaiser5.7%Elevance5.2%
  • UnitedHealthcare
  • Humana
  • Aetna/CVS
  • Kaiser Permanente
  • Elevance/Anthem/BCBS
  • 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
Share of members, largest carriers: values by month
MonthUnitedHealthcareHumanaAetna/CVSKaiser PermanenteElevance/Anthem/BCBS
Sep 202625.9%20.0%11.6%5.7%5.2%
Aug 202625.9%20.0%11.5%5.7%5.2%
Jul 202625.9%20.0%11.5%5.7%5.2%
Jun 202625.9%20.0%11.5%5.7%5.2%
May 202626.0%20.0%11.5%5.7%5.2%
Apr 202626.1%20.0%11.5%5.7%5.2%
Mar 202626.2%19.9%11.5%5.7%5.3%
Feb 202626.3%19.8%11.5%5.7%5.3%
Jan 202626.8%19.5%11.6%5.7%5.4%
Dec 202529.5%16.7%12.0%5.7%6.3%
Nov 202529.5%16.7%12.1%5.7%6.3%
Oct 202529.5%16.7%12.0%5.7%6.3%
Sep 202529.5%16.7%12.0%5.7%6.4%
Aug 202529.4%16.7%12.1%5.7%6.4%
Jul 202529.4%16.7%12.0%5.7%6.4%
Jun 202529.4%16.7%12.0%5.7%6.4%
May 202529.3%16.8%12.1%5.7%6.4%
Apr 202529.3%16.8%12.1%5.7%6.5%
Mar 202529.2%16.9%12.1%5.7%6.5%
Feb 202529.0%17.0%12.1%5.8%6.6%
Jan 202529.2%17.0%12.0%5.8%6.6%
Dec 202426.7%18.9%13.5%5.9%6.2%
Nov 202426.7%18.9%13.5%5.9%6.2%
Oct 202426.7%18.9%13.5%5.9%6.2%
Sep 202426.8%18.9%13.4%5.9%6.2%
Aug 202426.8%18.9%13.3%6.0%6.2%
Jul 202426.9%18.9%13.3%6.0%6.2%
Jun 202427.0%18.9%13.2%6.0%6.2%
May 202427.1%18.9%13.1%6.0%6.2%
Apr 202427.2%18.9%12.9%6.0%6.2%
Mar 202427.3%18.9%12.8%6.0%6.2%
Feb 202427.4%18.9%12.7%6.0%6.2%
Jan 202427.6%18.9%12.3%6.0%6.3%
Dec 202325.0%19.7%11.6%6.5%6.7%
Nov 202325.0%19.7%11.6%6.5%6.7%
Oct 202325.0%19.7%11.6%6.5%6.8%
Sep 202325.0%19.6%11.6%6.5%6.8%
Aug 202324.9%19.5%11.6%6.5%6.8%
Jul 2023–––––
Jun 202324.9%19.4%11.6%6.5%6.9%
May 202324.9%19.4%11.7%6.5%6.9%
Apr 202324.8%19.3%11.7%6.6%6.9%
Mar 202324.8%19.2%11.7%6.6%6.9%
Feb 202324.7%19.1%11.8%6.6%7.0%
Jan 202324.8%19.0%11.3%6.7%7.1%

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

Share of all members, with unlabelled

Each month adds to 100%. Hatched gray: contracts with no carrier label.

All members
Divides by every member, including those whose contract has no carrier label.
Share of all members, with unlabelledShare-of-total chart, January 2023 to September 2026. In September 2026: UnitedHealthcare 25.7%, Humana 19.8%, Aetna/CVS 11.5%, Kaiser Permanente 5.7%, Elevance/Anthem/BCBS 5.2%, Centene/Wellcare 2.5%, Other carriers 29.0%, Unlabelled 0.6%. Shaded bands mark months with no data.0%25%50%75%100%2023202420252026AUnitedHealthcare25.7%Humana19.8%Aetna/CVS11.5%Kaiser Permanente5.7%Elevance5.2%Other carriers29.0%
Share of all members, with unlabelledShare-of-total chart, January 2023 to September 2026. In September 2026: UnitedHealthcare 25.7%, Humana 19.8%, Aetna/CVS 11.5%, Kaiser Permanente 5.7%, Elevance/Anthem/BCBS 5.2%, Centene/Wellcare 2.5%, Other carriers 29.0%, Unlabelled 0.6%. Shaded bands mark months with no data.0%25%50%75%100%20232025AUHC25.7%Humana19.8%Aetna11.5%Kaiser5.7%Other29.0%
  • UnitedHealthcare
  • Humana
  • Aetna/CVS
  • Kaiser Permanente
  • Elevance/Anthem/BCBS
  • Centene/Wellcare
  • Other carriers
  • Unlabelled
  • Shaded: no data that month
  1. Note A: January 2026: January step: plan-year contract changes move members between carriers. Shares jump in this month.
View the data table
Share of all members, with unlabelled: share of total by month
MonthUnitedHealthcareHumanaAetna/CVSKaiser PermanenteElevance/Anthem/BCBSCentene/WellcareOther carriersUnlabelled
Sep 202625.7%19.8%11.5%5.7%5.2%2.5%29.0%0.6%
Aug 202625.7%19.9%11.5%5.7%5.2%2.6%28.9%0.6%
Jul 202625.8%19.9%11.5%5.7%5.2%2.6%28.8%0.6%
Jun 202625.8%19.9%11.5%5.6%5.2%2.6%28.8%0.6%
May 202625.8%19.9%11.4%5.6%5.2%2.6%28.7%0.6%
Apr 202625.9%19.8%11.4%5.6%5.2%2.7%28.7%0.6%
Mar 202626.0%19.8%11.4%5.6%5.2%2.7%28.6%0.6%
Feb 202626.2%19.7%11.4%5.6%5.3%2.7%28.5%0.6%
Jan 202626.6%19.4%11.5%5.7%5.4%2.7%28.1%0.7%
Dec 202528.8%16.3%11.7%5.6%6.1%2.6%26.5%2.4%
Nov 202528.8%16.3%11.8%5.6%6.2%2.6%26.4%2.4%
Oct 202528.8%16.3%11.8%5.6%6.2%2.7%26.3%2.4%
Sep 202528.7%16.3%11.7%5.6%6.2%2.7%26.3%2.5%
Aug 202528.7%16.3%11.7%5.6%6.2%2.7%26.2%2.6%
Jul 202528.6%16.3%11.7%5.6%6.2%2.7%26.2%2.6%
Jun 202528.6%16.3%11.7%5.6%6.3%2.7%26.2%2.6%
May 202528.5%16.4%11.8%5.6%6.3%2.7%26.2%2.6%
Apr 202528.5%16.4%11.8%5.6%6.3%2.8%26.1%2.6%
Mar 202528.4%16.4%11.8%5.6%6.3%2.8%26.1%2.6%
Feb 202528.3%16.6%11.8%5.6%6.4%2.8%25.9%2.6%
Jan 202528.4%16.5%11.7%5.7%6.5%2.8%25.8%2.6%
Dec 202425.2%17.8%12.7%5.6%5.8%2.8%24.2%5.9%
Nov 202425.1%17.8%12.7%5.6%5.8%2.9%24.2%5.9%
Oct 202425.2%17.8%12.7%5.6%5.9%2.9%24.2%5.9%
Sep 202425.2%17.8%12.7%5.6%5.9%2.9%24.2%5.9%
Aug 202425.3%17.8%12.6%5.6%5.8%2.9%24.2%5.9%
Jul 202425.3%17.8%12.5%5.6%5.8%2.9%24.1%5.9%
Jun 202425.4%17.8%12.4%5.6%5.8%2.9%24.1%5.9%
May 202425.4%17.7%12.3%5.6%5.8%2.9%24.1%6.1%
Apr 202425.6%17.7%12.2%5.6%5.8%3.0%24.1%6.0%
Mar 202425.7%17.8%12.0%5.6%5.8%3.0%24.1%6.0%
Feb 202425.8%17.8%11.9%5.6%5.9%2.9%24.1%6.1%
Jan 202426.0%17.8%11.6%5.7%5.9%3.0%24.0%6.1%
Dec 202322.3%17.6%10.4%5.8%6.0%3.5%23.7%10.7%
Nov 202322.3%17.6%10.3%5.8%6.0%3.5%23.7%10.8%
Oct 202322.3%17.6%10.4%5.8%6.1%3.5%23.7%10.8%
Sep 202322.3%17.5%10.4%5.8%6.1%3.5%23.7%10.7%
Aug 202322.3%17.4%10.4%5.8%6.1%3.6%23.7%10.8%
Jul 2023––––––––
Jun 202322.2%17.3%10.4%5.8%6.1%3.6%23.7%10.7%
May 202322.2%17.3%10.4%5.8%6.1%3.6%23.7%10.7%
Apr 202322.2%17.2%10.4%5.9%6.1%3.7%23.7%10.7%
Mar 202322.2%17.1%10.5%5.9%6.2%3.8%23.8%10.7%
Feb 202322.0%17.1%10.5%5.9%6.2%3.8%23.8%10.7%
Jan 202322.2%16.9%10.1%6.0%6.3%3.9%23.8%10.7%

CMS contract file. Share of all members, so each carrier reads a little lower than in the labelled-share chart. Members whose contract has no carrier label: 0.6% of all members in September 2026, 2.5% in September 2025, and 10.7% in January 2023. Shares divide by labelled members, so old and new months compare. Treat share changes as rough when the unlabelled part is large.

Who gained and who lost

Share of labelled members, September 2025 against September 2026. Most of a 12-month change usually comes in one January.

Share, September 2025 to September 2026

Percent of members with a carrier label

Share, September 2025 to September 2026Slope chart comparing September 2025 with September 2026. UnitedHealthcare: 29.5% to 25.9%; Humana: 16.7% to 20.0%; Aetna/CVS: 12.0% to 11.6%; Kaiser Permanente: 5.7% to 5.7%; Elevance/Anthem/BCBS: 6.4% to 5.2%; Centene/Wellcare: 2.8% to 2.5%; HCSC/BCBS: 2.7% to 2.5%; BCBS Michigan: 2.2% to 1.9%.September 2025September 2026UnitedHealthcare 29.5%25.9% UnitedHealthcareHumana 16.7%20.0% HumanaAetna/CVS 12.0%11.6% Aetna/CVSKaiser Permanente 5.7%5.7% Kaiser PermanenteElevance/Anthem/BCBS 6.4%5.2% Elevance/Anthem/BCBSCentene/Wellcare 2.8%2.5% Centene/WellcareHCSC/BCBS 2.7%2.5% HCSC/BCBSBCBS Michigan 2.2%1.9% BCBS Michigan
Share, September 2025 to September 2026Slope chart comparing September 2025 with September 2026. UnitedHealthcare: 29.5% to 25.9%; Humana: 16.7% to 20.0%; Aetna/CVS: 12.0% to 11.6%; Kaiser Permanente: 5.7% to 5.7%; Elevance/Anthem/BCBS: 6.4% to 5.2%; Centene/Wellcare: 2.8% to 2.5%; HCSC/BCBS: 2.7% to 2.5%; BCBS Michigan: 2.2% to 1.9%.September 2025September 2026UHC 29.5%25.9%Humana 16.7%20.0%Aetna 12.0%11.6%Kaiser 5.7%5.7%Elevance 6.4%5.2%Centene 2.8%2.5%Blue Cross 2.7%2.5%Blue Cross 2.2%1.9%
View the data table
Share, September 2025 to September 2026: September 2025 and September 2026
NameSeptember 2025September 2026Change
UnitedHealthcare29.5%25.9%−3.6 pts
Humana16.7%20.0%+3.3 pts
Aetna/CVS12.0%11.6%−0.5 pts
Kaiser Permanente5.7%5.7%0.0 pts
Elevance/Anthem/BCBS6.4%5.2%−1.2 pts
Centene/Wellcare2.8%2.5%−0.2 pts
HCSC/BCBS2.7%2.5%−0.2 pts
BCBS Michigan2.2%1.9%−0.3 pts

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

Carrier share, September 2026. Members and share of labelled members, with September 2025 for comparison.
RankCarrierMembersShare September 2026Share September 2025Change
1UnitedHealthcare9,312,13525.9%29.5%down 3.6 percentage points
2Humana7,175,38320.0%16.7%up 3.3 percentage points
3Aetna/CVS4,156,58911.6%12.0%down 0.5 percentage points
4Kaiser Permanente2,048,4275.7%5.7%no change
5Elevance/Anthem/BCBS1,869,5225.2%6.4%down 1.2 percentage points
6Centene/Wellcare913,7302.5%2.8%down 0.2 percentage points
7HCSC/BCBS886,3742.5%2.7%down 0.2 percentage points
8BCBS Michigan669,7511.9%2.2%down 0.3 percentage points
9Devoted Health531,3961.5%0.6%up 0.9 percentage points
10SCAN460,1991.3%0.9%up 0.4 percentage points
11Highmark/BCBS419,8991.2%1.4%down 0.2 percentage points
12MHH Healthcare, L.P.378,9161.1%1.0%up 0.1 percentage points
13Healthfirst, Inc.372,0071.0%1.0%no change
14BCBS Minnesota343,0811.0%0.7%up 0.2 percentage points
15Lifetime Healthcare, Inc.329,2410.9%0.8%up 0.2 percentage points
16Alignment Health297,8740.8%0.7%up 0.2 percentage points
17Corewell Health285,8400.8%0.7%up 0.1 percentage points
18Medica268,1660.7%0.5%up 0.3 percentage points
19Florida Blue/BCBS260,3570.7%0.8%down 0.1 percentage points
20UPMC Health System226,2650.6%0.7%no change
21Molina Healthcare, Inc.220,5060.6%0.6%no change
22BCBS Tennessee219,5180.6%0.6%no change
23BCBS North Carolina184,2940.5%0.5%no change
24Clover Health Holdings, Inc.158,0460.4%0.3%up 0.1 percentage points
25Independence/BCBS149,1010.4%0.4%no change
26Point32Health, Inc.147,5150.4%0.4%no change
–All other labelled carriers3,673,23910.2%––

Shares add to 100.0% of labelled members. Members whose contract has no carrier label: 0.6% of all members in September 2026, 2.5% in September 2025, and 10.7% in January 2023. Shares divide by labelled members, so old and new months compare. Treat share changes as rough when the unlabelled part is large. Carrier names are CMS labels. The 22 Blue Cross and Blue Shield labels stay separate. Carriers with 100,000 or more members have their own page.

How concentrated is the market?

UnitedHealthcare and Humana together held about 46% of labelled members in September 2026. That is within a point of September 2025. A standard concentration measure, the Herfindahl-Hirschman Index, points to a less concentrated market than a year earlier. The level depends on how carriers are grouped, so this page shows the direction only.

UnitedHealthcare and Humana combined

Percent of members with a carrier label, monthly

UnitedHealthcare and Humana combinedLine chart, January 2023 to September 2026. UnitedHealthcare + Humana: 45.9% in September 2026. Shaded bands mark months with no data.0%20%40%60%2023202420252026ABUHC + Humana45.9%
UnitedHealthcare and Humana combinedLine chart, January 2023 to September 2026. UnitedHealthcare + Humana: 45.9% in September 2026. Shaded bands mark months with no data.0%20%40%60%20232025ABUHC + Humana45.9%
  • UnitedHealthcare + 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
UnitedHealthcare and Humana combined: values by month
MonthUnitedHealthcare + Humana
Sep 202645.9%
Aug 202645.9%
Jul 202645.9%
Jun 202646.0%
May 202646.0%
Apr 202646.0%
Mar 202646.1%
Feb 202646.1%
Jan 202646.3%
Dec 202546.1%
Nov 202546.2%
Oct 202546.2%
Sep 202546.2%
Aug 202546.1%
Jul 202546.1%
Jun 202546.1%
May 202546.1%
Apr 202546.1%
Mar 202546.1%
Feb 202546.0%
Jan 202546.2%
Dec 202445.6%
Nov 202445.6%
Oct 202445.6%
Sep 202445.6%
Aug 202445.8%
Jul 202445.8%
Jun 202445.9%
May 202445.9%
Apr 202446.1%
Mar 202446.2%
Feb 202446.4%
Jan 202446.6%
Dec 202344.7%
Nov 202344.7%
Oct 202344.7%
Sep 202344.6%
Aug 202344.5%
Jul 2023–
Jun 202344.3%
May 202344.3%
Apr 202344.1%
Mar 202344.0%
Feb 202343.8%
Jan 202343.8%

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

Who leads each state

The leading carrier by labelled members in September 2026. UnitedHealthcare led 23 areas, Humana led 13 areas, Aetna/CVS led 7 areas. An area is a state or DC with data in both September 2025 and September 2026. 53 had data now and 54 a year earlier.

Leading carrier in each state

September 2026. Gray tiles have another leader, named in the table below.

Leading carrier in each stateTile map of US states and territories, one square per state. 52 places shown. Each tile is colored by category. The table lists every value.Alaska: Aetna/CVSAKMaine: Another carrier (see the table)MEWisconsin: UnitedHealthcareWIVermont: HumanaVTNew Hampshire: HumanaNHWashington: UnitedHealthcareWAIdaho: UnitedHealthcareIDMontana: HumanaMTNorth Dakota: Another carrier (see the table)NDMinnesota: Another carrier (see the table)MNIllinois: Aetna/CVSILMichigan: Another carrier (see the table)MINew York: Aetna/CVSNYMassachusetts: Another carrier (see the table)MAOregon: UnitedHealthcareORNevada: UnitedHealthcareNVWyoming: UnitedHealthcareWYSouth Dakota: Another carrier (see the table)SDIowa: Aetna/CVSIAIndiana: UnitedHealthcareINOhio: UnitedHealthcareOHPennsylvania: Aetna/CVSPANew Jersey: Aetna/CVSNJConnecticut: Aetna/CVSCTRhode Island: Another carrier (see the table)RICalifornia: Kaiser PermanenteCAUtah: UnitedHealthcareUTColorado: UnitedHealthcareCONebraska: UnitedHealthcareNEMissouri: UnitedHealthcareMOKentucky: HumanaKYWest Virginia: HumanaWVVirginia: HumanaVAMaryland: Kaiser PermanenteMDDelaware: UnitedHealthcareDEArizona: UnitedHealthcareAZNew Mexico: UnitedHealthcareNMKansas: UnitedHealthcareKSArkansas: UnitedHealthcareARTennessee: UnitedHealthcareTNNorth Carolina: HumanaNCSouth Carolina: HumanaSCDistrict of Columbia: UnitedHealthcareDCOklahoma: UnitedHealthcareOKLouisiana: HumanaLAMississippi: HumanaMSAlabama: HumanaALGeorgia: HumanaGAHawaii: UnitedHealthcareHITexas: UnitedHealthcareTXFlorida: HumanaFLPuerto Rico: Another carrier (see the table)PR
Leading carrier in each stateTile map of US states and territories, one square per state. 52 places shown. Each tile is colored by category. The table lists every value.Alaska: Aetna/CVSAKMaine: Another carrier (see the table)MEWisconsin: UnitedHealthcareWIVermont: HumanaVTNew Hampshire: HumanaNHWashington: UnitedHealthcareWAIdaho: UnitedHealthcareIDMontana: HumanaMTNorth Dakota: Another carrier (see the table)NDMinnesota: Another carrier (see the table)MNIllinois: Aetna/CVSILMichigan: Another carrier (see the table)MINew York: Aetna/CVSNYMassachusetts: Another carrier (see the table)MAOregon: UnitedHealthcareORNevada: UnitedHealthcareNVWyoming: UnitedHealthcareWYSouth Dakota: Another carrier (see the table)SDIowa: Aetna/CVSIAIndiana: UnitedHealthcareINOhio: UnitedHealthcareOHPennsylvania: Aetna/CVSPANew Jersey: Aetna/CVSNJConnecticut: Aetna/CVSCTRhode Island: Another carrier (see the table)RICalifornia: Kaiser PermanenteCAUtah: UnitedHealthcareUTColorado: UnitedHealthcareCONebraska: UnitedHealthcareNEMissouri: UnitedHealthcareMOKentucky: HumanaKYWest Virginia: HumanaWVVirginia: HumanaVAMaryland: Kaiser PermanenteMDDelaware: UnitedHealthcareDEArizona: UnitedHealthcareAZNew Mexico: UnitedHealthcareNMKansas: UnitedHealthcareKSArkansas: UnitedHealthcareARTennessee: UnitedHealthcareTNNorth Carolina: HumanaNCSouth Carolina: HumanaSCDistrict of Columbia: UnitedHealthcareDCOklahoma: UnitedHealthcareOKLouisiana: HumanaLAMississippi: HumanaMSAlabama: HumanaALGeorgia: HumanaGAHawaii: UnitedHealthcareHITexas: UnitedHealthcareTXFlorida: HumanaFLPuerto Rico: Another carrier (see the table)PR
  • Humana
  • Aetna/CVS
  • UnitedHealthcare
  • Kaiser Permanente
  • Another carrier (see the table)
View values for every state
Leading carrier in each state: by state
StateLeading carrier
AlabamaHumana
AlaskaAetna/CVS
ArizonaUnitedHealthcare
ArkansasUnitedHealthcare
CaliforniaKaiser Permanente
ColoradoUnitedHealthcare
ConnecticutAetna/CVS
DelawareUnitedHealthcare
District of ColumbiaUnitedHealthcare
FloridaHumana
GeorgiaHumana
HawaiiUnitedHealthcare
IdahoUnitedHealthcare
IllinoisAetna/CVS
IndianaUnitedHealthcare
IowaAetna/CVS
KansasUnitedHealthcare
KentuckyHumana
LouisianaHumana
MaineAnother carrier (see the table)
MarylandKaiser Permanente
MassachusettsAnother carrier (see the table)
MichiganAnother carrier (see the table)
MinnesotaAnother carrier (see the table)
MississippiHumana
MissouriUnitedHealthcare
MontanaHumana
NebraskaUnitedHealthcare
NevadaUnitedHealthcare
New HampshireHumana
New JerseyAetna/CVS
New MexicoUnitedHealthcare
New YorkAetna/CVS
North CarolinaHumana
North DakotaAnother carrier (see the table)
OhioUnitedHealthcare
OklahomaUnitedHealthcare
OregonUnitedHealthcare
PennsylvaniaAetna/CVS
Puerto RicoAnother carrier (see the table)
Rhode IslandAnother carrier (see the table)
South CarolinaHumana
South DakotaAnother carrier (see the table)
TennesseeUnitedHealthcare
TexasUnitedHealthcare
UtahUnitedHealthcare
VermontHumana
VirginiaHumana
WashingtonUnitedHealthcare
West VirginiaHumana
WisconsinUnitedHealthcare
WyomingUnitedHealthcare

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

Leaders that changed in 12 months

  • Humana took the lead from UnitedHealthcare in Alabama.
  • Aetna/CVS took the lead from UnitedHealthcare in Connecticut.
  • Humana took the lead from UnitedHealthcare in Georgia.
  • UnitedHealthcare took the lead from BCBS Idaho in Idaho.
  • Aetna/CVS took the lead from UnitedHealthcare in Iowa.
  • Humana took the lead from UnitedHealthcare in Louisiana.
  • Kaiser Permanente took the lead from UnitedHealthcare in Maryland.
  • Humana took the lead from UnitedHealthcare in New Hampshire.
  • Aetna/CVS took the lead from UnitedHealthcare in New Jersey.
  • Aetna/CVS took the lead from UnitedHealthcare in New York.
  • Humana took the lead from UnitedHealthcare in North Carolina.
  • Medica took the lead from BCBS Michigan in North Dakota.
  • Humana took the lead from UnitedHealthcare in South Carolina.
  • Humana took the lead from UnitedHealthcare in Vermont.
  • Humana took the lead from UnitedHealthcare in Virginia.
View the leader in every state
Leading carrier by state, September 2026, with the leader in September 2025
StateLeader nowShareLeader September 2025
AlabamaHumana33.1%UnitedHealthcare
AlaskaAetna/CVS47.7%Aetna/CVS
ArizonaUnitedHealthcare40.6%UnitedHealthcare
ArkansasUnitedHealthcare40.5%UnitedHealthcare
CaliforniaKaiser Permanente41.5%Kaiser Permanente
ColoradoUnitedHealthcare44.6%UnitedHealthcare
ConnecticutAetna/CVS43.2%UnitedHealthcare
DelawareUnitedHealthcare41.0%UnitedHealthcare
District of ColumbiaUnitedHealthcare62.0%UnitedHealthcare
FloridaHumana38.1%Humana
GeorgiaHumana29.4%UnitedHealthcare
HawaiiUnitedHealthcare29.9%UnitedHealthcare
IdahoUnitedHealthcare42.7%BCBS Idaho
IllinoisAetna/CVS31.7%Aetna/CVS
IndianaUnitedHealthcare35.1%UnitedHealthcare
IowaAetna/CVS30.6%UnitedHealthcare
KansasUnitedHealthcare39.4%UnitedHealthcare
KentuckyHumana53.0%Humana
LouisianaHumana41.5%UnitedHealthcare
MaineMartin's Point Health Care, Inc.28.8%Martin's Point Health Care, Inc.
MarylandKaiser Permanente26.1%UnitedHealthcare
MassachusettsPoint32Health, Inc.23.3%Point32Health, Inc.
MichiganBCBS Michigan36.5%BCBS Michigan
MinnesotaBCBS Minnesota49.7%BCBS Minnesota
MississippiHumana43.1%Humana
MissouriUnitedHealthcare44.8%UnitedHealthcare
MontanaHumana69.4%Humana
NebraskaUnitedHealthcare39.7%UnitedHealthcare
NevadaUnitedHealthcare30.4%UnitedHealthcare
New HampshireHumana38.5%UnitedHealthcare
New JerseyAetna/CVS30.8%UnitedHealthcare
New MexicoUnitedHealthcare33.8%UnitedHealthcare
New YorkAetna/CVS18.7%UnitedHealthcare
North CarolinaHumana33.4%UnitedHealthcare
North DakotaMedica61.2%BCBS Michigan
OhioUnitedHealthcare23.1%UnitedHealthcare
OklahomaUnitedHealthcare41.6%UnitedHealthcare
OregonUnitedHealthcare30.2%UnitedHealthcare
PennsylvaniaAetna/CVS27.3%Aetna/CVS
Puerto RicoMHH Healthcare, L.P.52.7%MHH Healthcare, L.P.
Rhode IslandBCBS Rhode Island49.8%BCBS Rhode Island
South CarolinaHumana37.4%UnitedHealthcare
South DakotaMedica58.9%Medica
TennesseeUnitedHealthcare28.3%UnitedHealthcare
TexasUnitedHealthcare47.8%UnitedHealthcare
U.S. Virgin IslandsUnitedHealthcare99.5%UnitedHealthcare
UtahUnitedHealthcare47.1%UnitedHealthcare
VermontHumana39.7%UnitedHealthcare
VirginiaHumana34.4%UnitedHealthcare
WashingtonUnitedHealthcare45.6%UnitedHealthcare
West VirginiaHumana48.9%Humana
WisconsinUnitedHealthcare35.2%UnitedHealthcare
WyomingUnitedHealthcare48.3%UnitedHealthcare

Carriers that entered or left

Counts include only carriers with 1,000 or more members.

Carriers new to the national file with 1,000 or more members in September 2026: Neighborhood Health Plan Of Rhode Island (10,967), DLP Marquette Health Plan, LLC (2,984), Kern Health Systems (KHS) (1,343), San Francisco Health Authority (1,225), and Santa Cruz Monterey Merced San Benito Mariposa Man (1,091).

Carriers with 1,000 or more members a year earlier and none now: UCare Minnesota (27,750 then) and Group 1001 (7,872 then). A carrier that leaves the file can be a plan that ended or a label that changed. The file does not say which.

Questions about carrier share

Which company has the most Medicare Advantage members?

UnitedHealthcare, with 9,312,135 members in September 2026. That is 25.9% of members with a carrier label. Humana was second with 7,175,383 (20.0%). Counts come from the CMS contract file and include employer group plans.

How did UnitedHealthcare and Humana change in the last year?

From September 2025 to September 2026, UnitedHealthcare's share fell 3.6 points to 25.9%, and Humana's rose 3.3 points to 20.0%. Most of the drop came in one month, January 2026 (−2.66 points). Most of the gain came in one month, January 2026 (+2.80 points). The data does not show why shares moved.

Which carrier leads the most states?

UnitedHealthcare led 23 areas in September 2026, down from about 35 a year earlier. Humana led 13, up from 5. Leaders are by labelled members in the CMS contract file.

Why do these shares differ from other reports?

These shares divide by members whose contract has a carrier label. In September 2026, 0.6% of members had no label. Other sources use a different month, group carriers under parent companies, or leave out employer group plans. Compare only figures with the same basis and month.

How concentrated is the market?

UnitedHealthcare and Humana together held about 46% of labelled members in September 2026. That is within a point of September 2025. A standard concentration measure, the Herfindahl-Hirschman Index, points to a less concentrated market than a year earlier. The level depends on how carriers are grouped, so this page shows the direction only.

Cite and download

Cite this page

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

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Data as of September 2026. See the methodology and our editorial policy. 35.96 million labelled members in the contract file.

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