42 CFR § 414.4
Fee schedule areas
June 11, 2020
(a) General. CMS establishes physician fee schedule areas that generally conform to the geographic localities in existence before January 1, 1992.
(b) Changes. CMS announces proposed changes to fee schedule areas in the Federal Register and provides an opportunity for public comment. After considering public comments, CMS publishes the final changes in the Federal Register.
[59 FR 63463, Dec. 8, 1994]