45 C.F.R. § 156.295
(a) General requirement. In a form, manner, and at such times specified by HHS, a QHP issuer must provide to HHS the following information:
(2) The aggregate amount, and the type of rebates, discounts or price concessions (excluding bona fide service fees) that the QHP issuer or its contracted PBM negotiates that are attributable to patient utilization under the QHP, and the aggregate amount of the rebates, discounts, or price concessions that are passed through to the QHP issuer, and the total number of prescriptions that were dispensed.
(b) Confidentiality. Information disclosed by a QHP issuer or a PBM under this section is confidential and shall not be disclosed by HHS or by a QHP receiving the information, except that HHS may disclose the information in a form which does not disclose the identity of a specific PBM, QHP, or prices charged for drugs, for the following purposes: