Medicare in South Dakota serves about 175,000 beneficiaries, with 30% enrolled in Medicare Advantage and the remainder on Original Medicare + Medigap. Average Medigap Plan G premium for a new 65-year-old enrollee: $127/mo. Stand-alone Part D plans average $41/mo.
Medicare Beneficiaries
175,000
Age 65+ and disabled
MA Enrollment
30%
% on Medicare Advantage
Avg Medigap Plan G
$127/mo
New enrollee, age 65
| Topic | Detail | Notes |
|---|---|---|
| Medicare Advantage plans available | 12+ | Varies by county; check medicare.gov plan finder |
| Top MA carriers | Sanford Health Plan, UnitedHealthcare, Wellmark (BCBS South Dakota) | Networks differ by county |
| Stand-alone Part D | $41/mo | Required if you have Original Medicare + Medigap |
| Annual guaranteed-issue Medigap switching | No (one-time 6-month window at 65) | No state annual GI rights; Sanford Health (headquartered in Sioux Falls) is the dominant integrated health system and MA carrier in South Dakota. |
Medigap premiums vary by carrier, age, and ZIP code. The 2026 Part B premium is $202.90/month and Part B deductible is $283. Part D out-of-pocket cap is $2,100 in 2026.
South Dakota's Medicare market is dominated by Sanford Health, a Sioux Falls-based integrated health system that operates both hospitals and a health insurance plan across the Dakotas. Sanford Health Plan MA consistently earns high quality ratings in the state and leverages the system's extensive primary care and specialty presence. The state's MA enrollment at about 30% is well below the national average, reflecting the rural character of much of South Dakota and the challenge of building adequate provider networks outside the Sioux Falls and Rapid City corridors. Avera Health, headquartered in Sioux Falls, is Sanford's primary competitor for hospital market share and also participates in MA networks.
South Dakota has a significant Native American population on reservations including Pine Ridge, Rosebud, and Cheyenne River, where the Indian Health Service and Tribal health facilities are primary care access points. Medicare coordination with tribal health programs is an important consideration for beneficiaries on or near reservations. Medigap Plan G averages about $127/month in South Dakota — affordable, consistent with Plains state pricing. Black Hills/Rapid City beneficiaries have access to Regional Health (now Monument Health) for hospital care. South Dakota has no birthday rule or annual Medigap switching protections.
In South Dakota, traditional Medicare combined with a Medigap supplement (typically Plan G or N) plus a stand-alone Part D plan provides nationwide access with predictable costs. Plan G covers everything except the $283 Part B deductible.
Medicare Advantage (Part C) plans bundle Medicare Parts A, B, and usually D into one private plan, often with $0 premium beyond Part B. Trade-offs include network restrictions and prior authorization. 30% of South Dakota beneficiaries currently choose MA.
No state annual GI rights; Sanford Health (headquartered in Sioux Falls) is the dominant integrated health system and MA carrier in South Dakota.
💡 South Dakota Pro Tip
South Dakota has one of the smaller Medicare Advantage markets in the country, with typically 12 to 20 plans available in Sioux Falls and Rapid City. Rural South Dakota counties may have only 5 to 10 MA plan options, which contributes to the state's relatively low MA enrollment rate. Sanford Health Plan and Wellmark Blue Cross Blue Shield are the primary local options.
The average Medigap Plan G premium for a 65-year-old in South Dakota is approximately $127 per month. Sanford Health Plan, Wellmark, and Mutual of Omaha are among the carriers offering Medigap options in the state. The limited number of carriers means shopping all available options is especially important.
South Dakota does not have a birthday rule or annual guaranteed-issue protections for Medigap. Outside your initial 6-month open enrollment at 65 or qualifying federal events, insurers can apply medical underwriting. Native American beneficiaries should speak with their tribal health coordinator about how Medigap interacts with Indian Health Service and tribal health benefits.
Beneficiary counts and MA enrollment percentages from CMS state-level Medicare data; premium averages from 2026 carrier rate filings for South Dakota. Verify current plan costs at medicare.gov before enrolling.
Jennifer Walsh
Editorial Lead, Health & Medicare
This article was researched and written by the Cover Forge USA editorial team against federal sources (NAIC, CMS, FEMA, DOL, SSA, state DOIs) and standard policy forms. Bylines organize content by topic — they do not assert individual licensure. See our editorial-policy for details.
Reviewed May 2026
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