MA Enrollment Explorer / South Dakota / Codington County

Medicare Advantage in Codington County, South Dakota

3,236 people in Codington County, South Dakota were enrolled in Medicare Advantage in October 2026, 47.5% of 6,806 eligible beneficiaries (−6.9 pts since October 2025). Medica Holding Company is the largest parent organization with 90% of reported enrollment; 4 parent organizations have 11 or more members and the HHI is 8,242 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 486 members here are in plans that terminate or leave the county. MA plans offered go from 5 to 5.

47.5%MA penetration, October 2026

3,236MA enrollees

90%leading parent's share

66.5%MSSP ACO share of Original Medicare, PY 2024

Open the county on the market map Medicare Advantage in South Dakota

Parent organizations in Codington County

Parent organization	Members	Change since October 2025	Share
Medica Holding Company	2,903	−48	90.4%
UnitedHealth Group, Inc.	275	−118	8.6%
CVS Health Corporation	19	−2	0.6%
Sanford Health	15	new	0.5%

CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.

Value-based care alongside MA

In PY 2024, 1,568 beneficiaries in Codington County were assigned to 19 Medicare Shared Savings Program ACOs, 66.5% 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.