Medicare in Lyman County, South Dakota · Plan Year 2026

Medicare Advantage Plans in Lyman County, SD: Your Complete 2026 Guide

No standard Medicare Advantage plans are sold in Lyman County for 2026 — but that is not the end of the story. CMS counts 730 Medicare beneficiaries here, and 8 Medicare Cost plans serve the county, alongside Original Medicare with Medigap and standalone Part D. Below is the real data for Lyman County.

Page last revised: 2026-07-19 · Plan and enrollment data refreshed: 2026-07-19 · Plan year 2026

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A South Dakota specialty

Medicare Cost plans in Lyman County

South Dakota is one of the few states where Medicare Cost plans are still common. They combine plan benefits with a safety valve: outside the network, care simply falls back to Original Medicare rates. Lyman County has 8 Cost plans for 2026 from Medica with 123 county enrollees. The most-enrolled Cost plan locally is Medica Prime Solution Standard (Cost).

Cost plans are quoted person-by-person — ask us to compare them against the Original Medicare + Medigap route for your situation.

Health profile · why plan choice matters here

Chronic conditions among Lyman County adults

The right coverage depends on your health. CDC PLACES model-based prevalence for Lyman County (3,705 residents) — a reason to check each plan's drug formulary and specialist network before enrolling:

Source: CDC PLACES: Local Data for Better Health, County (crude prevalence).

How and when to enroll in Lyman County

When you can sign up

• Initial Enrollment Period — the 7-month window around your 65th birthday (3 before, your birthday month, 3 after). Medicare 101 →
• Annual Enrollment Period — October 15 to December 7 each year, for 2027 coverage decisions.
• Medicare Advantage Open Enrollment — January 1 to March 31, one switch allowed if you already have an MA plan.
• Special Enrollment Periods — after life events like moving counties, losing employer coverage, or qualifying for Extra Help.

Ways to enroll

• With a licensed local agent (free) — Big Sioux Benefits · (605) 555-0142 · Mon–Fri 8am–6pm CT. We compare the plans we offer in Lyman County against your doctors and drugs.
• Directly with a plan's carrier — using the CMS plan ID from the tables above.
• Through Medicare.gov — the federal plan finder and enrollment portal.

Plan availability in Lyman County

2026 plans in the tables above are sold county-wide. That includes residents of Kennebec, Lower Brule, Oacoma, Presho, Reliance, Vivian, West Brule, and all other Lyman County communities. To enroll in Medicare Advantage or a Cost plan you must be enrolled in Medicare Part A and Part B and live in the plan's service area.

Sources, citations, and methodology

• CMS Medicare Advantage/Part D Landscape (PY2026) — accessed 2026-07-19
• CMS Medicare Part C & D Star Ratings (2026) — accessed 2026-07-19
• CMS Medicare Advantage Enrollment by State/County/Contract — accessed 2026-07-19
• CMS Medicare Monthly Enrollment (county) — accessed 2026-07-19
• CDC PLACES: Local Data for Better Health, County (crude prevalence) — accessed 2026-07-19
• CMS Hospital Compare — Overall Star Ratings — accessed 2026-07-19
• US Census Bureau — Places by County (2020) — accessed 2026-07-19

Methodology: plan counts, premiums, out-of-pocket maximums, Part D deductibles, and star ratings are computed from the CMS PY2026 Landscape source files for Lyman County, South Dakota. Headline "average premium" and "$0 premium" figures use the Part C premium; the consolidated Part C + D premium is reported separately. Special Needs Plans (D-SNP, I-SNP) and Medicare Cost plans are excluded from Medicare Advantage averages and shown separately. County enrollment sums CMS contract-level enrollment for Lyman County; CMS suppresses counts under 11, so totals are conservative. Health prevalence figures are CDC PLACES model-based estimates. Content is prepared by the Big Sioux Benefits Data Desk and reviewed for accuracy against the cited files; plan details change — verify with a licensed agent before enrolling.

Big Sioux Benefits is a licensed insurance agency, not affiliated with or endorsed by the U.S. government or the federal Medicare program. We do not offer every plan available in your area. Contact Medicare.gov or 1-800-MEDICARE for all options.

Comparing Lyman County to the rest of South Dakota

Plans are approved county by county, so the list above is not the state's list. For the statewide picture — every plan sold in South Dakota, carrier enrollment, Medicare Cost plans, star-rating spread, and the counties with no Advantage plan at all — see the South Dakota Medicare guide (2026) → or browse all 66 county guides.