20 C.F.R. § 30.707
Payment for a procedure, service or device identified by a HCPCS/CPT code shall not exceed the amount derived by multiplying the RVU values for that procedure by the GPCI values for services in that area and by the conversion factor to arrive at a dollar amount assigned to one unit in that category of service.
(c) For example, if the RVUs for a particular surgical procedure are 2.48 for physician's work (W), 3.63 for practice expense (PE), and 0.48 for malpractice insurance (M), and the conversion factor assigned to one unit in that category of service (surgery) is $61.20, then the maximum allowable charge for one performance of that procedure is the product of the three RVUs times the corresponding GPCI values for the locality times the conversion factor. If the GPCI values for the locality are 0.988(W), 0.948 (PE), and 1.174 (M), then the maximum payment calculation is:
[(2.48)(0.988) + (3.63)(0.948) + (0.48)(1.174)] × $61.20
[2.45 + 3.44 + .56] × $61.20
6.45 × $61.20 = $394.74
[84 FR 3055, Feb. 8, 2019]