5 C.F.R. § 890.908

An FEHB plan, under the oversight of OPM, will notify the Secretary of HHS, or the Secretary's designee, if the plan finds that:

(a) A hospital knowingly and willfully collects, on a repeated basis, more than the amount determined to be equivalent to the Medicare part A payment under the DRG-based PPS.

(b) A Medicare participating physician or supplier knowingly and willfully collects, on a repeated basis, more than the amount determined to be equivalent to the Medicare part B payment under the Medicare Participating Physician Fee Schedule.

(c) A Medicare nonparticipating physician or supplier knowingly and willfully charges, on a repeated basis, more than the amount determined to be equivalent to the Medicare limiting charge amount.