S.D. Codified Laws § 58-17-21

There shall be a provision as follows: "Notice of claim: Written notice of claim must be given to the insurer within twenty days after the occurrence or commencement of any loss covered by the policy, or as soon thereafter as is reasonably possible. Notice given by or on behalf of the insured or the beneficiary to the insurer at __________ (insert the location of such office as the insurer may designate for the purpose), or to any authorized insurance producer of the insurer, with information sufficient to identify the insured, shall be deemed notice to the insurer."