S.D. Codified Laws § 58-18-63
Premium rates for employer health benefit plans shall produce a minimum lifetime loss ratio of not less than seventy-five percent. The director may promulgate rules pursuant to chapter 1-26 which modify the minimum loss ratio required based upon the specific plan design or other objective and pertinent criteria. An insurer is not required to meet the minimum loss ratio on each policy issued. An insurer which does not make a filing specifying the blocks of business for which it will meet the minimum loss ratio requirements of this section will be required to meet the minimum loss ratio requirement in the aggregate on its entire employer block of business in this state. This section does not apply to any insurer which is required to comply with § 58-17-64.
SDCL 58-18-63