Medicare Advantage · CareSource · enrollment Oct 2026
CareSource: 85K Medicare Advantage members in 8 states, leading 0.
CareSource holds 0.3% of the country’s visible Medicare Advantage members, 34th among 165 carriers. Its largest state is Massachusetts with 44,731 members and 9.2% share. Over twelve months it grew in 4 states and shrank in 0.
Visible members
85K
Oct 2026
National share
0.3%
34th of 165
States
8
10 plans with members
States led
0
first by visible members
Growing in
4
states, twelve months
Shrinking in
0
states, twelve months
CareSource in every state it sells in
Largest state first. Rank is among the carriers with visible members in the state; counties led counts counties where the carrier has the most visible members and another carrier is visible. A state with a link has a page on CareSource’s position there.
| State | Members | Share | Rank | Twelve months | Counties led | Rating |
|---|---|---|---|---|---|---|
| Massachusetts | 44,731 | 9.2% | 5 of 13 | +163.2% | 1 | 4.50 |
| Ohio | 38,483 | 3.1% | 8 of 19 | +356.8% | 0 | 3.50 |
| New York | 894 | 0.1% | 20 of 22 | +6.0% | 0 | – |
| Georgia | 662 | 0.1% | 13 of 13 | +845.7% | 0 | – |
| Wisconsin | 258 | 0.0% | 14 of 15 | – | 0 | – |
| New Hampshire | 42 | 0.1% | 5 of 5 | – | 0 | – |
| Rhode Island | 18 | 0.0% | 5 of 5 | – | 0 | – |
| Connecticut | 15 | 0.0% | 9 of 9 | – | 0 | – |
Carrier Command · for Medicare Advantage plans
The read on CareSource in every state is in Carrier Command.
Each state's position page on CareSource: risk and rebate against the market, Stars levers, the election-period forecast, exits and the county standing, rebuilt every month.
Other carriers
The largest Medicare Advantage parents nationally, by visible members.
- UnitedHealth7.64M
- Humana6.40M
- Aetna (CVS)2.80M
- Elevance1.50M
- Kaiser1.49M
- Centene883K
- Health Care Service Corporation779K
- Devoted530K
- SCAN Group460K
- Healthfirst, Inc.374K
- MHH Healthcare, L.P.346K
- Highmark Health318K
- Alignment Healthcare USA, LLC299K
- Lifetime Healthcare, Inc.296K
- Aware Integrated, Inc.288K
- Corewell Health257K
- UPMC Health System220K
- Molina219K
- BlueCross BlueShield of Tennessee216K
- Blue Cross Blue Shield of Michigan Mutual Ins. Co.211K
- Guidewell Mutual Holding Corporation203K
- CuraCor Solutions Corp.182K
- Clover Health Holdings, Inc.157K
- Independence Health Group, Inc.143K
How these numbers are made
- Members are visible members: CMS suppresses any plan-county cell of ten or fewer, so small counties undercount. Market share excludes employer group plans.
- Enrollment is Oct 2026. CareSource is the parent organization CareSource; its plans may sell under other brand names in each state.
- A state's twelve-month change, counties led and rating come from that state's page and carry its vintages.
- Every figure comes from public CMS data as Livmor reads it, and the page is rebuilt when a new month posts. Livmor Carrier Command, public CMS data.