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Medicare Advantage Enrollment Tracker · Arizona

Medicare Advantage Enrollment in Arizona

Arizona had 808,220 Medicare Advantage members in September 2026, by the CMS county file, which includes employer group plans. That is up 2.7% from Sep 2025, faster than the national 2.0%. Arizona ranks 12th by members and holds 2.3% of the national total.

UnitedHealthcare leads with 40.6% of members who have a carrier label (contract file, September 2026). Among individual plans, which leave out employer group coverage, enrollment is up 3.3% 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.

Arizona at a glance

Medicare Advantage members

808,220

Arizona members by month: from 700K in Jan 2023 to 808K in Sep 2026

County file · Sep 2026. Includes employer group plans. Rank: 12.

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

+2.7%

up 2.7 percent vs Sep 2025

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

Share of national total

2.3%

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

Individual plan members

707,351

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

40.6% of members with a carrier label. Contract file · Sep 2026.

Arizona members by month

Medicare Advantage members in Arizona

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 ArizonaLine chart, January 2023 to September 2026. Arizona: 808K in September 2026. Shaded bands mark months with no data.650K700K750K800K850K2023202420252026Arizona808K
Medicare Advantage members in ArizonaLine chart, January 2023 to September 2026. Arizona: 808K in September 2026. Shaded bands mark months with no data.650K700K750K800K850K20232025Arizona808K
  • Arizona
  • Shaded: no data that month
View the data table
Medicare Advantage members in Arizona: values by month
MonthArizona
Sep 2026808K
Aug 2026808K
Jul 2026807K
Jun 2026806K
May 2026805K
Apr 2026803K
Mar 2026802K
Feb 2026799K
Jan 2026789K
Dec 2025790K
Nov 2025790K
Oct 2025789K
Sep 2025787K
Aug 2025786K
Jul 2025784K
Jun 2025783K
May 2025782K
Apr 2025781K
Mar 2025780K
Feb 2025777K
Jan 2025768K
Dec 2024761K
Nov 2024761K
Oct 2024759K
Sep 2024758K
Aug 2024757K
Jul 2024755K
Jun 2024754K
May 2024754K
Apr 2024751K
Mar 2024750K
Feb 2024746K
Jan 2024744K
Dec 2023–
Nov 2023724K
Oct 2023722K
Sep 2023721K
Aug 2023719K
Jul 2023–
Jun 2023717K
May 2023715K
Apr 2023713K
Mar 2023712K
Feb 2023711K
Jan 2023700K

County file · Sep 2026. Employer group plans included.

Arizona 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.
Arizona and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Arizona: 115.5 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.1001051101151202023202420252026National117.8Arizona115.5
Arizona and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. Arizona: 115.5 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.10010511011512020232025National117.8Arizona115.5
  • Arizona
  • National (same jurisdictions each month)
  • Shaded: no data that month
View the data table
Arizona and the nation, Jan 2023 = 100: values by month
MonthArizonaNational (same jurisdictions each month)
Sep 2026115.5117.8
Aug 2026115.4117.8
Jul 2026115.3117.5
Jun 2026115.2117.4
May 2026115.1117.2
Apr 2026114.8116.9
Mar 2026114.6116.7
Feb 2026114.2116.3
Jan 2026112.8114.7
Dec 2025112.9115.9
Nov 2025112.9115.9
Oct 2025112.7115.7
Sep 2025112.5115.5
Aug 2025112.4115.3
Jul 2025112.1115
Jun 2025111.9114.8
May 2025111.7114.4
Apr 2025111.7114.2
Mar 2025111.5113.8
Feb 2025111113.4
Jan 2025109.7111.9
Dec 2024108.7112
Nov 2024108.7112
Oct 2024108.5111.7
Sep 2024108.3111.5
Aug 2024108.1111.2
Jul 2024107.9110.9
Jun 2024107.7110.7
May 2024107.8110.5
Apr 2024107.4110
Mar 2024107.1109.7
Feb 2024106.6109.3
Jan 2024106.3108.7
Dec 2023––
Nov 2023103.5105.9
Oct 2023103.2105.6
Sep 2023103105.2
Aug 2023102.8104.9
Jul 2023––
Jun 2023102.4104.1
May 2023102.2103.8
Apr 2023101.9103.4
Mar 2023101.8103
Feb 2023101.5102.2
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 Arizona

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 40.6% of members who have a carrier label (contract file, September 2026).

UnitedHealthcare lost 5.7 points in 12 months; most of that change came in January 2026.

Humana gained 6.1 points in 12 months; most of that change came in January 2026.

UnitedHealthcare and Humana together hold 62.6%, about the same as in Sep 2025.

The market is less 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: 46.3% to 40.6%; Humana: 15.9% to 22.0%; HCSC/BCBS: 9.8% to 9.6%; BCBS Arizona: 5.3% to 5.9%; Centene/Wellcare: 5.6% to 5.8%; Aetna/CVS: 7.6% to 4.8%.Sep 2025Sep 2026UnitedHealthcare 46.3%40.6% UnitedHealthcareHumana 15.9%22.0% HumanaHCSC/BCBS 9.8%9.6% HCSC/BCBSBCBS Arizona 5.3%5.9% BCBS ArizonaCentene/Wellcare 5.6%5.8% Centene/WellcareAetna/CVS 7.6%4.8% Aetna/CVS
Carrier share, Sep 2025 to Sep 2026Slope chart comparing Sep 2025 with Sep 2026. UnitedHealthcare: 46.3% to 40.6%; Humana: 15.9% to 22.0%; HCSC/BCBS: 9.8% to 9.6%; BCBS Arizona: 5.3% to 5.9%; Centene/Wellcare: 5.6% to 5.8%; Aetna/CVS: 7.6% to 4.8%.Sep 2025Sep 2026UHC 46.3%40.6%Humana 15.9%22.0%Blue Cross 9.8%9.6%Blue Cross 5.3%5.9%Centene 5.6%5.8%Aetna 7.6%4.8%
View the data table
Carrier share, Sep 2025 to Sep 2026: Sep 2025 and Sep 2026
NameSep 2025Sep 2026Change
UnitedHealthcare46.3%40.6%−5.7 pts
Humana15.9%22.0%+6.1 pts
HCSC/BCBS9.8%9.6%−0.2 pts
BCBS Arizona5.3%5.9%+0.6 pts
Centene/Wellcare5.6%5.8%+0.2 pts
Aetna/CVS7.6%4.8%−2.8 pts

Contract file · Sep 2026. Employer group plans included.

Carrier share of Medicare Advantage members with a carrier label, Arizona, September 2026
CarrierShare, Sep 2026Share, Sep 2025ChangeMembers
UnitedHealthcare40.6%46.3%−5.7 pts326,333
Humana22.0%15.9%+6.1 pts176,864
HCSC/BCBS9.6%9.8%−0.2 pts77,063
BCBS Arizona5.9%5.3%+0.6 pts47,357
Centene/Wellcare5.8%5.6%+0.2 pts46,694
Aetna/CVS4.8%7.6%−2.8 pts38,897
Devoted Health2.4%1.5%+0.8 pts18,976
Banner Health2.3%3.2%−0.9 pts18,260
All other carriers1.5%––12,215
SCAN1.4%0.5%+1.0 pts11,607
Mercy Care1.4%1.4%0.0 pts10,884
Alignment Health1.3%0.8%+0.5 pts10,419
Elevance/Anthem1.1%1.2%−0.1 pts8,584

Insurer not assigned in CMS data: 0.2% of all members in Sep 2026, 0.5% 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 Arizona

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 Arizona by individual Medicare Advantage members, September 2026
CountyMembers12-month changeLeading carrierLeader's share
Maricopa371,288+3.0%UnitedHealthcare34.0%
Pima133,082+3.0%UnitedHealthcare55.6%
Pinal53,635+6.8%UnitedHealthcare33.5%
Mohave37,196+4.0%Humana65.4%
Yavapai33,918+2.2%Humana39.3%
Yuma23,095+5.6%Centene/Wellcare36.3%
Cochise16,052+1.7%Centene/Wellcare39.9%
Navajo8,895+3.4%Humana42.4%
Santa Cruz7,549+4.4%Centene/Wellcare29.7%
Gila6,303+0.6%UnitedHealthcare44.3%

Browse all counties.

Common questions

How many people have Medicare Advantage in Arizona?

Arizona had 808,220 members in September 2026, by the CMS county file (employer group plans included). Individual plans, which leave out employer group coverage, had 707,351 members in September 2026.

Is Medicare Advantage growing in Arizona?

Enrollment is up 2.7% from Sep 2025 to Sep 2026, faster than the national 2.0%. Among individual plans, which leave out employer group coverage, enrollment is up 3.3% in the 12 months to September 2026.

Which carrier has the most Medicare Advantage members in Arizona?

UnitedHealthcare leads with 40.6% of members who have a carrier label (contract file, September 2026). UnitedHealthcare and Humana together hold 62.6%, about the same as in Sep 2025. Shares leave out members whose contract has no carrier label: 0.2% of members.

Cite and download

Cite this page

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

Download Arizona 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