Medicare Advantage in Harris County, Texas
410,227 people in Harris County, Texas were enrolled in Medicare Advantage in October 2026, 61.4% of 668,487 eligible beneficiaries (+0.1 pts since October 2025). UnitedHealth Group, Inc. is the largest parent organization with 36% of reported enrollment; 21 parent organizations have 11 or more members and the HHI is 1,956 (highly concentrated). For 2027, 67,038 members here are in plans that terminate or leave the county, and Memorial Hermann Health System leaves. MA plans offered go from 69 to 49.
Parent organizations in Harris County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| UnitedHealth Group, Inc. | 146,942 | −5,255 | 35.9% |
| Health Care Service Corporation | 64,806 | +1,357 | 15.8% |
| CVS Health Corporation | 47,955 | −6,461 | 11.7% |
| Humana Inc. | 45,379 | +11,847 | 11.1% |
| Centene Corporation | 33,409 | −4,684 | 8.2% |
| Elevance Health, Inc. | 29,415 | +423 | 7.2% |
| Devoted Health, Inc. | 23,972 | +12,089 | 5.9% |
| Memorial Hermann Health System | 8,920 | +1,241 | 2.2% |
| Verda Healthcare, Inc. | 2,991 | +428 | 0.7% |
| SCAN Group | 2,460 | +2,144 | 0.6% |
| Molina Healthcare, Inc. | 1,630 | −441 | 0.4% |
| Harris County Hospital District | 966 | +284 | 0.2% |
| First Sacramento Capital Funding LLC | 198 | −53 | under 0.1% |
| Blue Cross Blue Shield of Michigan Mutual Ins. Co. | 191 | −15 | under 0.1% |
| Regency ISNP Holdings LLC | 141 | +35 | 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, 54,707 beneficiaries in Harris County were assigned to 313 Medicare Shared Savings Program ACOs, 35.4% of assignable Original Medicare beneficiaries. Together, roughly 75% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.