(1) Medicaid reimbursement for mental health services shall be the lowest of:

(a) the provider's actual (submitted) charge for the service; or

(b) the rate established in the department's fee schedule. The department adopts and incorporates by reference the department's Medicaid Mental Health and Mental Health Services Plan, Individuals Under 18 Years of Age Fee Schedule dated August 1, 2011. A copy of the fee schedule may be obtained from the Department of Public Health and Human Services, Developmental Services Division, Children's Mental Health Bureau, 111 Sanders, P.O. Box 4210, Helena, MT 59604 or at www.mt.medicaid.org.