Section 17-311-164 - Field audit and other rate adjustments(a) Every facility for which self-pay charges are established may be audited as deemed necessary by the commissioner. Therefore, each facility shall maintain all supporting expenditure records up-to-date and available for review for a minimum period of ten years from date of previous audit, regardless whether the facility has changed ownership or not.(b) In the event that a recomputation of a facility's state rate due to field audits or otherwise requires a change in a state rate which has served as the basis for a prior computation of the facility's self-pay charges, the self-pay charges shall be recomputed. However the recomputation shall only be implemented retroactively if it constitutes a downward self-pay rate adjustment. Increases in self-pay rate may only be implemented after all self-pay patients in the facility have been given notice of the rate increase, as determined by the commissioner, at least thirty days prior to the effective date of such rate increase. The facility shall be required to make appropriate refund as provided in section 17-311-163(b).Conn. Agencies Regs. § 17-311-164