(1) Prescription drug benefits include drugs prescribed by a health care provider acting within the scope of his practice.

(2) Chemotherapy drugs approved for use in humans by the U.S. food and drug administration, vaccines, prenatal vitamins, and drugs needed after an organ or tissue transplant are covered.

(3) Prescribed diabetic supplies including insulin, test tape, syringes, needles and lancets are covered as a prescription drug.

(4) Food supplements and vitamins are not covered except prenatal vitamins and medical foods for treatment of inborn errors of metabolism as provided in 33-22-131 , MCA. The need for a prescription to obtain food supplements or vitamins shall not affect the application of this rule.

(5) The insurer shall use the medicaid formulary if it chooses to employ a formulary.