The department may establish a formulary of the drugs which will not be reimbursed by the program. This formulary shall include experimental drugs and drugs on the Drug Efficacy Study Implementation List prepared by CMS. A medical exception may be permitted by the department for reimbursement of a drug on the Drug Efficacy Study Implementation List upon declaration of its necessity on the prescription by the treating physician or certified registered nurse practitioner, except that, for DESI drugs for which the FDA has issued a Notice for Opportunity Hearing (NOOH) for the purpose of withdrawing the New Drug Application approved for that drug, reimbursement coverage shall be discontinued under the provisions of this subchapter.