Medicare Advantage in Cobb County, Georgia
60,913 people in Cobb County, Georgia were enrolled in Medicare Advantage in October 2026, 48.7% of 125,077 eligible beneficiaries (+0.3 pts since October 2025). Humana Inc. is the largest parent organization with 30% of reported enrollment; 14 parent organizations have 11 or more members and the HHI is 1,804 (highly concentrated). For 2027, 10,727 members here are in plans that terminate or leave the county, and CareSource leaves. MA plans offered go from 43 to 32.
Parent organizations in Cobb County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 18,399 | +7,137 | 30.3% |
| UnitedHealth Group, Inc. | 11,661 | −4,786 | 19.2% |
| CVS Health Corporation | 9,506 | −2,595 | 15.6% |
| Kaiser Foundation Health Plan, Inc. | 6,233 | +242 | 10.3% |
| Elevance Health, Inc. | 5,524 | −642 | 9.1% |
| Devoted Health, Inc. | 4,976 | +4,059 | 8.2% |
| Health Care Service Corporation | 1,963 | −541 | 3.2% |
| Clover Health Holdings, Inc. | 1,616 | +703 | 2.7% |
| Centene Corporation | 567 | −1,051 | 0.9% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 121 | −13 | 0.2% |
| UNICO Services, Inc. | 97 | +27 | 0.2% |
| CareSource | 52 | +37 | under 0.1% |
| Highmark Health | 18 | +3 | under 0.1% |
| California Physicians' Service | 11 | 0 | under 0.1% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 27,336 beneficiaries in Cobb County were assigned to 205 Medicare Shared Savings Program ACOs, 64.5% of assignable Original Medicare beneficiaries. Together, roughly 82% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.