The provider shall submit the request for payment in the format designated by the Department. The Department reserves the right to return to the provider, before payment, all invoices not properly signed, completed, and accompanied by any properly completed forms required by the Department. The provider shall charge the Program the provider's customary charge to the general public for similar services and charge the provider's acquisition cost for injectable drugs or dispensed medical supplies. If the service is free to individuals not covered by Medicaid: The provider: May charge the Program; and Shall be reimbursed in accordance with §D of this regulation; and The provider's reimbursement is not limited to the provider's customary charge. The Department shall reimburse the physician assistant for covered services at the lesser of: The provider's customary charge unless the service is free to individuals not covered by Medicaid; or The maximum rates according to COMAR 10.09.02.07E. Payments on Medicare claims are authorized, if: Services are covered by the Program; The provider accepts Medicare assignments; Medicare makes direct payment to the provider; Medicare has determined that services were medically justified; and Initial billing is made directly to Medicare according to Medicare guidelines. The Department shall make supplemental payments on Medicare claims subject to the following provisions: Deductible insurance shall be paid in full; and Coinsurance shall be paid at the lesser of: 100 percent of the coinsurance amount; or The balance remaining after the Medicare payment is subtracted from the Medicaid rate. The provider may not bill the Program for: Completion of forms and reports; Broken or missed appointments; Professional services rendered by mail; and Providing a copy of a participant's medical record when requested by another licensed provider on behalf of the participant. The Program may not make direct payment to participants. Billing time limitations for claims submitted pursuant to this chapter are set forth in COMAR 10.09.36. Physician assistants who are employed by or under contract to any physician, clinic, or hospital may not bill for any service for which reimbursement is sought by the physician, clinic, or hospital.