(1) Licensed chiropractors accepting prepayment for services planned, but not yet delivered must:
(a) Establish an escrow account to hold all prepayment funds.
(i) Funds may be removed from the escrow account following the delivery of services, in such amounts equal to the chiropractor's usual and customary charges for like services, with any discounted percentage contained in a written contract.
(ii) Funds received in advance of the day services are delivered must be deposited into the escrow account in a timely manner.
(b) Maintain a contract for prepayment of services.