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Medicare Advantage Enrollment Tracker · South Carolina

Medicare Advantage Enrollment in South Carolina

South Carolina had 604,600 Medicare Advantage members in September 2026, by the CMS county file, which includes employer group plans. That is up 3.1% from Sep 2025, faster than the national 2.0%. South Carolina ranks 22nd by members and holds 1.7% of the national total.

Humana leads with 37.4% of members who have a carrier label (contract file, September 2026). UnitedHealthcare led a year earlier. Among individual plans, which leave out employer group coverage, enrollment is up 3.5% 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.

South Carolina at a glance

Medicare Advantage members

604,600

South Carolina members by month: from 497K in Jan 2023 to 605K in Sep 2026

County file · Sep 2026. Includes employer group plans. Rank: 22.

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

+3.1%

up 3.1 percent vs Sep 2025

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

Share of national total

1.7%

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

Individual plan members

550,330

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

Humana

37.4% of members with a carrier label. Contract file · Sep 2026.

South Carolina members by month

Medicare Advantage members in South Carolina

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 South CarolinaLine chart, January 2023 to September 2026. South Carolina: 605K in September 2026. Shaded bands mark months with no data.450K500K550K600K650K2023202420252026South Carolina605K
Medicare Advantage members in South CarolinaLine chart, January 2023 to September 2026. South Carolina: 605K in September 2026. Shaded bands mark months with no data.450K500K550K600K650K20232025South605K
  • South Carolina
  • Shaded: no data that month
View the data table
Medicare Advantage members in South Carolina: values by month
MonthSouth Carolina
Sep 2026605K
Aug 2026604K
Jul 2026602K
Jun 2026601K
May 2026600K
Apr 2026597K
Mar 2026597K
Feb 2026593K
Jan 2026583K
Dec 2025588K
Nov 2025588K
Oct 2025587K
Sep 2025586K
Aug 2025585K
Jul 2025583K
Jun 2025582K
May 2025580K
Apr 2025578K
Mar 2025577K
Feb 2025573K
Jan 2025562K
Dec 2024564K
Nov 2024563K
Oct 2024562K
Sep 2024561K
Aug 2024559K
Jul 2024557K
Jun 2024556K
May 2024556K
Apr 2024552K
Mar 2024551K
Feb 2024549K
Jan 2024546K
Dec 2023–
Nov 2023524K
Oct 2023522K
Sep 2023520K
Aug 2023518K
Jul 2023–
Jun 2023515K
May 2023513K
Apr 2023510K
Mar 2023509K
Feb 2023507K
Jan 2023497K

County file · Sep 2026. Employer group plans included.

South Carolina 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.
South Carolina and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. South Carolina: 121.5 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.1001101201302023202420252026South Carolina121.5National117.8
South Carolina and the nation, Jan 2023 = 100Line chart, January 2023 to September 2026. South Carolina: 121.5 in September 2026. National (same jurisdictions each month): 117.8 in September 2026. Shaded bands mark months with no data.10011012013020232025South121.5National117.8
  • South Carolina
  • National (same jurisdictions each month)
  • Shaded: no data that month
View the data table
South Carolina and the nation, Jan 2023 = 100: values by month
MonthSouth CarolinaNational (same jurisdictions each month)
Sep 2026121.5117.8
Aug 2026121.4117.8
Jul 2026121.1117.5
Jun 2026120.9117.4
May 2026120.5117.2
Apr 2026120.1116.9
Mar 2026120116.7
Feb 2026119.3116.3
Jan 2026117.3114.7
Dec 2025118.3115.9
Nov 2025118.2115.9
Oct 2025118.1115.7
Sep 2025117.9115.5
Aug 2025117.5115.3
Jul 2025117.2115
Jun 2025117114.8
May 2025116.5114.4
Apr 2025116.2114.2
Mar 2025116113.8
Feb 2025115.3113.4
Jan 2025113111.9
Dec 2024113.4112
Nov 2024113.3112
Oct 2024113111.7
Sep 2024112.8111.5
Aug 2024112.4111.2
Jul 2024112110.9
Jun 2024111.8110.7
May 2024111.7110.5
Apr 2024111110
Mar 2024110.7109.7
Feb 2024110.4109.3
Jan 2024109.8108.7
Dec 2023––
Nov 2023105.4105.9
Oct 2023104.9105.6
Sep 2023104.6105.2
Aug 2023104.2104.9
Jul 2023––
Jun 2023103.5104.1
May 2023103.1103.8
Apr 2023102.6103.4
Mar 2023102.3103
Feb 2023101.9102.2
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 South Carolina

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.

Humana leads with 37.4% of members who have a carrier label (contract file, September 2026). UnitedHealthcare led a year earlier.

Humana gained 6.3 points in 12 months; most of that change came in January 2026.

UnitedHealthcare lost 9.1 points in 12 months; most of that change came in January 2026.

UnitedHealthcare and Humana together hold 63.8%, down 2.8 points from 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. Humana: 31.0% to 37.4%; UnitedHealthcare: 35.6% to 26.5%; Aetna/CVS: 17.8% to 13.4%; BCBS South Carolina: 6.0% to 8.2%; Devoted Health: 1.6% to 5.1%; Centene/Wellcare: 4.1% to 4.2%.Sep 2025Sep 2026Humana 31.0%37.4% HumanaUnitedHealthcare 35.6%26.5% UnitedHealthcareAetna/CVS 17.8%13.4% Aetna/CVSBCBS South Carolina 6.0%8.2% BCBS South CarolinaDevoted Health 1.6%5.1% Devoted HealthCentene/Wellcare 4.1%4.2% Centene/Wellcare
Carrier share, Sep 2025 to Sep 2026Slope chart comparing Sep 2025 with Sep 2026. Humana: 31.0% to 37.4%; UnitedHealthcare: 35.6% to 26.5%; Aetna/CVS: 17.8% to 13.4%; BCBS South Carolina: 6.0% to 8.2%; Devoted Health: 1.6% to 5.1%; Centene/Wellcare: 4.1% to 4.2%.Sep 2025Sep 2026Humana 31.0%37.4%UHC 35.6%26.5%Aetna 17.8%13.4%Blue Cross 6.0%8.2%Devoted 1.6%5.1%Centene 4.1%4.2%
View the data table
Carrier share, Sep 2025 to Sep 2026: Sep 2025 and Sep 2026
NameSep 2025Sep 2026Change
Humana31.0%37.4%+6.3 pts
UnitedHealthcare35.6%26.5%−9.1 pts
Aetna/CVS17.8%13.4%−4.5 pts
BCBS South Carolina6.0%8.2%+2.2 pts
Devoted Health1.6%5.1%+3.5 pts
Centene/Wellcare4.1%4.2%0.0 pts

Contract file · Sep 2026. Employer group plans included.

Carrier share of Medicare Advantage members with a carrier label, South Carolina, September 2026
CarrierShare, Sep 2026Share, Sep 2025ChangeMembers
Humana37.4%31.0%+6.3 pts224,520
UnitedHealthcare26.5%35.6%−9.1 pts158,990
Aetna/CVS13.4%17.8%−4.5 pts80,415
BCBS South Carolina8.2%6.0%+2.2 pts49,162
Devoted Health5.1%1.6%+3.5 pts30,736
Centene/Wellcare4.2%4.1%0.0 pts25,014
HCSC/BCBS2.7%2.2%+0.5 pts16,152
All other carriers0.8%––4,698
Clover0.6%0.3%+0.3 pts3,478
Molina0.5%0.2%+0.4 pts3,121
Elevance/Anthem0.5%0.5%0.0 pts3,108
BCBS Michigan0.2%0.2%0.0 pts1,323

Insurer not assigned in CMS data: 0.2% of all members in Sep 2026, 1.5% 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 South Carolina

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 South Carolina by individual Medicare Advantage members, September 2026
CountyMembers12-month changeLeading carrierLeader's share
Greenville54,938+2.8%Humana38.8%
Horry51,775+6.6%Humana39.9%
Spartanburg40,201+4.1%Humana48.9%
Richland32,615+5.1%Humana46.6%
Charleston27,913+1.9%Humana31.2%
Anderson26,057+3.3%Humana45.1%
Lexington26,014+4.2%Humana41.1%
York24,139+4.0%Humana32.5%
Berkeley19,812+4.4%Humana36.5%
Aiken17,948+3.4%Humana52.4%

Browse all counties.

Common questions

How many people have Medicare Advantage in South Carolina?

South Carolina had 604,600 members in September 2026, by the CMS county file (employer group plans included). Individual plans, which leave out employer group coverage, had 550,330 members in September 2026.

Is Medicare Advantage growing in South Carolina?

Enrollment is up 3.1% from Sep 2025 to Sep 2026, faster than the national 2.0%. Among individual plans, which leave out employer group coverage, enrollment is up 3.5% in the 12 months to September 2026.

Which carrier has the most Medicare Advantage members in South Carolina?

Humana leads with 37.4% of members who have a carrier label (contract file, September 2026). UnitedHealthcare led a year earlier. UnitedHealthcare and Humana together hold 63.8%, down 2.8 points from 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 South Carolina, data as of September 2026. Source: CMS public enrollment files. https://www.seniordealclub.com/medicare-advantage/enrollment/states/south-carolina

Download South Carolina 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