ARSD 20:06:58:27. Availability of plan information -- Reasons for denial

The reason for any denial under a group health plan, or health insurance coverage offered in connection with such plan, of reimbursement or payment for services with respect to mental health or substance use disorder benefits in the case of any participant or beneficiary must be made available by the plan administrator, or the health insurance issuer offering such coverage, to the participant or beneficiary, in accordance with this section.