Neither Oscar Health nor Aetna sells 2026 ACA marketplace plans in South Dakota; the insurers that do are Avera Health Plans, Sanford Health Plan and Wellmark of South Dakota. The right choice depends on your income, which doctors and hospitals you need in-network, and your prescription medications — not which carrier has the better logo.
2026 marketplace check, South Dakota: Oscar Health – no plans. Aetna – no plans. Source: CMS 2026 marketplace plan files.
Oscar Health isn’t among the insurers CMS lists for 2026 marketplace plans in South Dakota.
Aetna (CVS Health) left the ACA individual marketplace in every state at the end of 2025, so there is no Aetna marketplace plan to buy in South Dakota for 2026. Aetna still sells employer group coverage.
| Oscar Health | Aetna | |
|---|---|---|
| 2026 marketplace plans in South Dakota | No | No |
| Parent company | Oscar Health, Inc. | CVS Health |
| Plan type | No 2026 marketplace plans in South Dakota | National carrier with pharmacy integration |
Oscar Health vs Aetna in South Dakota
In South Dakota, marketplace plans are sold through HealthCare.gov, and neither carrier is on it for 2026. Plan availability, networks, and premiums vary significantly by county and ZIP code across South Dakota — what is available in Sioux Falls and Rapid City is not necessarily available in smaller or rural parts of the state.
The most important thing to understand about comparing any two marketplace carriers: premium is not the same as cost. A plan with a lower monthly premium may have a higher deductible, narrower network, or worse formulary coverage for your medications — resulting in higher total annual spending than a plan that cost more per month.
About Oscar Health in South Dakota
Oscar Health isn’t among the insurers CMS lists for 2026 marketplace plans in South Dakota.
Best for: Not an option on the South Dakota marketplace in 2026. Enter your ZIP code below and Daniel will compare the insurers that are.
About Aetna in South Dakota
Aetna is backed by CVS Health, which also operates prescription benefit management (Caremark) and retail pharmacy. Aetna (CVS Health) left the ACA individual marketplace in every state at the end of 2025, so there is no Aetna marketplace plan to buy in South Dakota for 2026. Aetna still sells employer group coverage. Aetna's CVS Health integration gives members access to MinuteClinic locations for routine care.
Prescriptions: Aetna plans often feature preferred pricing for CVS pharmacy locations. Check if your prescriptions are on the Aetna formulary at an acceptable tier.
Best for: Not an option on the South Dakota marketplace in 2026. Enter your ZIP code below and Daniel will compare the insurers that are.
How to Choose Between the Two
Neither carrier sells 2026 marketplace plans in South Dakota, so compare the insurers that do: Avera Health Plans, Sanford Health Plan and Wellmark of South Dakota. Compare their after-subsidy premiums, network coverage for your specific doctors, and formulary coverage for your prescriptions before deciding.
If you qualify for ACA subsidies: Compare after-subsidy costs: the cheaper-looking plan before subsidies may not be cheapest after your premium tax credit is applied.
If you are paying full unsubsidized cost: At full unsubsidized cost, total annual cost (premium + expected out-of-pocket) determines value. Consider deductible, OOP max, and network breadth.
What to Check Before You Choose
Before selecting either plan, do these four checks using each carrier’s provider directory and formulary tool:
- Doctor check: Search for your primary care physician and any specialists you see regularly in each carrier’s South Dakota provider directory. Networks can be narrow, and a doctor who is in-network with one carrier may not be with the other.
- Hospital check: Confirm the hospital you would go to for a planned procedure or emergency is in-network. Hospital network participation differs from physician network participation.
- Drug formulary check: Look up every prescription you take in the formulary for each plan you are considering. Note the tier and the cost-sharing for each. Small formulary differences can result in hundreds of dollars in annual cost difference.
- After-subsidy premium: If you qualify for a premium tax credit, enter your income and household size at the federal marketplace (healthcare.gov) to see the after-subsidy premium for each plan. The after-subsidy number is what you actually pay.
This state has expanded Medicaid. Buyers with income below approximately $21,600/year (single adult) may qualify for free Medicaid coverage instead of a marketplace plan.
An independent broker completes all four checks at no cost to you. Call (713) 575-9904 for a free Oscar Health vs Aetna comparison for your South Dakota ZIP code.