S.D. Codified Laws § 58-17-19
There shall be a provision as follows: "Reinstatement: If any renewal premium be not paid within the time granted the insured for payment, a subsequent acceptance of premium by the insurer or by any insurance producer duly authorized by the insurer to accept such premium, without requiring in connection therewith an application for reinstatement, shall reinstate the policy; provided, however, that if the insurer or such insurance producer requires an application for reinstatement and issues a conditional receipt for the premium tendered, the policy will be reinstated upon approval of such application by the insurer or, lacking such approval, upon the forty-fifth day following the date of such conditional receipt unless the insurer has previously notified the insured in writing of its disapproval of such application. The reinstated policy shall cover only loss resulting from such accidental injury as may be sustained after the date of reinstatement and loss due to such sickness as may begin more than ten days after such date. In all other respects the insured and insurer shall have the same rights thereunder as they had under the policy immediately before the due date of the defaulted premium, subject to any provisions endorsed hereon or attached hereto in connection with a reinstatement. Any premium accepted in connection with a reinstatement shall be applied to a period for which premium has not been previously paid, but not to any period more than sixty days prior to the date of reinstatement."
SDCL 58-17-19