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South Dakota Loss Costs Fall as WC Medical Risk Rises

NCCI's South Dakota filing proposes a 5.1% voluntary-market workers compensation loss-cost decrease effective July 1, 2026. For self-insured employers, the reserve issue is whether lower frequency evidence should reduce the expected claim ratio when medical benefits are moving the other way.

By Sam, EditorJuly 2026 · 3 min read

On February 12, 2026, NCCI filed its South Dakota workers compensation loss cost and assigned-risk rate summary with the South Dakota Division of Insurance for a July 1, 2026 effective date. The filing proposes a 5.1% decrease to voluntary-market loss costs and a 4.9% decrease to assigned-risk rates.

That is the headline. The reserve story is the offset inside the same filing: NCCI also says the proposed change accounts for an increase to medical benefits from enacted medical fee schedule changes.

Who it affects

This matters for South Dakota self-insured employers, large deductible buyers, captives with retained workers compensation exposure, and multi-state employers with a meaningful South Dakota payroll slice. The South Dakota Department of Labor and Regulation’s current self-insured company list includes health systems, retailers, utilities, food processors, delivery firms, and manufacturers, which is exactly the kind of mixed class-code population where a statewide filing can be useful but incomplete.

Employers that use NCCI loss costs or Expected Loss Rates as an outside check on a workers compensation expected claim ratio should isolate South Dakota by accident year, payroll class, and claim type. A retailer, hospital system, utility, and meat processor should not all import the statewide 5.1% decrease into the same reserve assumption.

Reserve mechanism

The reserve lever is the expected claim ratio, not a blanket reduction in unpaid claims. NCCI says the filing is based on premium and loss experience as of year-end 2024 from policy years 2019 through 2023. It cites improved experience versus the July 1, 2025 filing, a small decline in lost-time claims relative to premium, and a continuing long-term decline in lost-time claim frequency.

Those facts support downward pressure on the prospective benchmark. In a Bornhuetter-Ferguson indication, the selected expected claim ratio carries much of the weight for immature accident years because the paid and reported triangles have not yet earned much credibility. If the South Dakota prior was anchored to older bureau loss costs, the July 1 filing belongs in the 2026 expected-ratio bridge.

The medical sentence keeps the bridge from becoming mechanical. South Dakota’s employee benefits summary says the employer, through the carrier or self-insured program, must furnish necessary first aid, medical, surgical, rehabilitation, and hospital services for compensable injuries. If enacted fee schedule changes raise medical benefits, open medical reserves and recent paid medical severity can move against the frequency-driven decrease.

That is the same distinction raised in the recent Arkansas loss-cost filing and Texas loss-cost filing pieces: a statewide filing is a prospective benchmark, not proof that old lost-time claims are overreserved. South Dakota also participates in NCCI’s 2026 shift to three-decimal loss costs, rates, and Expected Loss Rates, covered in our NCCI benchmark piece. That makes class-weighted payroll blending more important than the statewide average.

For a self-insured employer, the test is simple: compare South Dakota lost-time counts per payroll, medical paid per open claim, closure rates, and case-reserve adequacy against the filing signal. If frequency improved but medical utilization or fee schedule pricing is higher, the right answer may be a modest expected-ratio decrease for new accident years and no release on older medical-heavy files. For the broader diagnostic, start with the workers compensation IBNR guide.

What this means for your next review

Put a South Dakota expected claim ratio bridge on the next reserve-study agenda. Ask whether the 2026 pick moves by the full 5.1% filing change, by a payroll-weighted class blend, or by a credibility-weighted adjustment to your own frequency and medical severity. Also ask whether post-July paid medical emergence is being monitored separately from indemnity, because that is where the filing’s medical-benefit offset should show up first.

Sources

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