(a) The agency must maintain documentation of payment rates and make it available to HHS upon request.
(b) The agency must record, in State manuals or other official files, the following information for increases in payment rates for individual practitioner services:
(1) An estimate of the percentile of the range of customary charges to which the revised payment structure equates and a description of the methods used to make the estimate.
(2) An estimate of the composite average percentage increase of the revised payment rates over the preceding rates.