S.D. Codified Laws § 58-17-160

A health carrier or plan provider subject to §§ 58-17-154 to 58-17-162, inclusive, shall have the right to request a review of the treatment that a person is receiving not more than once every three months unless the insurer and the person's licensed physician or licensed psychologist execute an agreement that a more frequent review is necessary. Any agreement regarding the right to review a treatment plan more frequently applies only to a particular person receiving applied behavior analysis and may not apply to all persons receiving applied behavior analysis by a licensed physician, licensed psychologist, or licensed behavior analyst. The cost of obtaining a review under this section shall be paid by the health carrier or plan.