Medicare Advantage in Polk County, Florida
127,675 people in Polk County, Florida were enrolled in Medicare Advantage in October 2026, 69.3% of 184,200 eligible beneficiaries (+0.6 pts since October 2025). Humana Inc. is the largest parent organization with 44% of reported enrollment; 22 parent organizations have 11 or more members and the HHI is 2,718 (highly concentrated). HRSA classifies the county as partly rural. For 2027, 25,339 members here are in plans that terminate or leave the county, and Health First Shared Services, Inc. leaves. MA plans offered go from 61 to 50.
Parent organizations in Polk County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Humana Inc. | 55,990 | +5,310 | 44.0% |
| UnitedHealth Group, Inc. | 30,807 | −2,886 | 24.2% |
| Elevance Health, Inc. | 14,000 | +1,588 | 11.0% |
| CVS Health Corporation | 7,914 | −2,433 | 6.2% |
| Devoted Health, Inc. | 5,503 | +1,954 | 4.3% |
| BayCare Health System, Inc. | 3,797 | +1,796 | 3.0% |
| Guidewell Mutual Holding Corporation | 3,605 | −1,129 | 2.8% |
| Centene Corporation | 2,546 | −304 | 2.0% |
| Health Care Service Corporation | 1,190 | −129 | 0.9% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 1,032 | −97 | 0.8% |
| Athena Healthcare Holdings, LLC | 368 | +295 | 0.3% |
| Ultimate Healthcare Holdings, LLC | 301 | +242 | 0.2% |
| Highmark Health | 102 | +9 | under 0.1% |
| Health First Shared Services, Inc. | 61 | new | under 0.1% |
| DOCTORS HEALTHCARE PLANS, INC. | 33 | new | 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, 21,008 beneficiaries in Polk County were assigned to 316 Medicare Shared Savings Program ACOs, 48.5% of assignable Original Medicare beneficiaries. Together, roughly 84% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.