If the admitting physician has a direct or indirect financial interest of 5 percent
            or more in the provider, the latter cannot impose charges for excess costs upon the
            beneficiary.
         
         Authorization to make charges for excess costs is effective only prospectively and
            does not extend beyond the end of the cost period for which the cost limit is applicable.
            Thus, where all requirements for imposing charges for excess costs (e.g., public notice
            of the charges) are not met, until after the beginning of the cost period for which
            the charges would be applicable, the charges can be made only during the remainder
            of the cost period.
         
         Where program reimbursement for items or services to which the limits are applied
            plus the provider’s charges to beneficiaries exceed the provider’s actual cost for
            the cost period, program reimbursement will be reduced by the amount of the excess.
         
         Where a provider requests a review of the applicable costs limits and the limit is
            raised as a result (e.g., because of a typical services) the provider is responsible
            for refunding to the beneficiary (or whoever paid the charges) amounts which, on the
            basis of the correction of the cost limit, were erroneously collected. Where the total
            erroneously collected on this basis from a beneficiary during the cost period is $5
            or less, the provider need not make a refund unless the payer requests it. However,
            any amounts which are not refunded, either because they are within this tolerance
            or because the provider is unable to locate the beneficiary, will be offset against
            program payment.