S.D. Codified Laws § 58-17H-27

A health carrier shall maintain written procedures pursuant to this chapter, for making standard utilization review and benefit determinations on requests submitted to the health carrier by covered persons or their authorized representatives for benefits and for notifying covered persons and their authorized representatives of its determinations with respect to these requests within the specified time frames required under this chapter. If a period of time is extended as permitted by this chapter due to a claimant's failure to submit information necessary to decide a prospective, retrospective, or disability claim, the period for making the benefit determination shall be tolled from the date on which the notification of the extension is sent to the claimant until the date on which the claimant responds to the request for additional information.