Medicare Advantage

HMO or PPO? South Dakota Medicare Advantage for 2027: 2 HMO Plans, 20 PPO

SIOUX FALLS — For the 2027 plan year, South Dakotans weighing Medicare Advantage will see a lineup that leans heavily toward PPO designs, with a smaller HMO presence and a notable set of Cost plans still in the mix. The counts come from the Centers for Medicare & Medicaid Services (CMS) Landscape Source Files for CY2027, and they describe what is offered somewhere in the state — not necessarily in every county.

How many Medicare Advantage plans are offered in South Dakota for 2027, and how do they split by type?

South Dakota has 28 Medicare Advantage plans available statewide for 2027, drawn from 5 carriers. By plan type, that breaks down to 2 HMO plans, 20 PPO plans, and 6 Cost plans, with the HMO figure including HMO-POS designs.

Each plan is counted once statewide in these totals, but availability is set county by county. A plan on the statewide list may or may not be offered in your specific ZIP code. The full plan-by-plan and county-by-county details are rendered as tables elsewhere on this page.

What do HMO, HMO-POS, PPO, and PFFS mean for networks, referrals, and out-of-network care?

In plain terms, these labels describe how a plan handles its provider network and what happens when you go outside it. An HMO (Health Maintenance Organization) generally asks you to use in-network doctors and hospitals and may require a referral from a primary care provider to see a specialist. Out-of-network care is typically not covered except in emergencies.

An HMO-POS (Point of Service) is an HMO with a limited point-of-service option that may allow some out-of-network care under defined rules. A PPO (Preferred Provider Organization) typically lets you see any provider that accepts Medicare and the plan's terms, with in-network care usually costing less than out-of-network care, and generally without referrals. A PFFS (Private Fee-for-Service) plan sets its own payment terms with providers; no PFFS plan appears in South Dakota's 2027 statewide list.

Cost plans, which still make up 6 of South Dakota's 2027 offerings, are a separate Medicare contract type that can let members use Original Medicare for services received outside the plan's network. The specific rules depend on the individual plan's Evidence of Coverage.

Which carriers offer HMO and PPO plans in South Dakota for 2027?

For 2027, the HMO offering in South Dakota comes from Great Plains Medicare Advantage, the sole carrier listed for that plan type in the state. On the PPO side, four carriers appear in the statewide file: Aetna (CVS Health), Align powered by Sanford Health Plan, Medica, and UnitedHealthcare.

That split — one HMO carrier, four PPO carriers — explains why the plan counts tilt the way they do (2 HMO, 20 PPO). It does not say anything about which plans are offered in a given county, which doctors or hospitals participate, or what any plan costs or covers. Those details sit with each plan's own documents and the Medicare Plan Finder.

How do I decide whether an HMO or PPO fits my doctors and travel in South Dakota?

Start with two practical questions: Where do you get your care, and how often do you cross state lines? If your doctors, specialists, and preferred hospital are all in one coordinated network you already use, an HMO or HMO-POS structure may feel natural. If you split time between South Dakota and another state, see out-of-area specialists, or want more flexibility to go out-of-network, a PPO structure may be worth a closer look.

Beyond network shape, check three things for any plan you're considering: whether your providers are in-network, whether your prescriptions are on the plan's formulary, and what the plan's rules say about prior authorization and referrals. The Medicare Plan Finder at medicare.gov will show which plans are offered at your address, and each plan's Evidence of Coverage and provider directory spell out the specifics.

What should South Dakota beneficiaries do before December 7, 2026?

The Annual Enrollment Period for 2027 coverage runs October 15 through December 7, 2026. A plan you choose during that window takes effect January 1, 2027. If you take no action, your current coverage generally renews under its 2027 terms, which may differ from 2026.

A short checklist helps:

• Read your plan's Annual Notice of Change, which outlines what's changing for 2027.
• Make a list of your doctors, hospitals, and regular prescriptions.
• Use the Medicare Plan Finder at medicare.gov to see which 2027 plans are available in your county and how they match your list.
• If you want to switch, complete the change by December 7, 2026.

The deadline is a date on the calendar, not a reason to rush. It is simply the point at which 2027 choices close.

Where can South Dakotans get free help comparing 2027 Medicare Advantage plans?

The two no-cost, non-sales resources available to every South Dakota beneficiary are Medicare.gov and 1-800-MEDICARE. Medicare.gov hosts the official Plan Finder, which lets you enter your ZIP code and prescriptions to see the plans offered in your county for 2027. 1-800-MEDICARE is staffed around the clock and can walk you through enrollment windows, plan types, and how to compare options.

For plan-specific questions — a particular doctor's network status, a drug tier, a prior authorization rule — the authoritative source is the plan itself, through its Evidence of Coverage and member services line.