49 CFR 390.101: Scope.

(a) The rules in this subpart establish the minimum qualifications for FMCSA certification of a medical examiner and for listing the examiner on FMCSA's National Registry of Certified Medical Examiners. The National Registry of Certified Medical Examiners is designed to improve highway safety and operator health by requiring that medical examiners be trained and certified to determine effectively whether an operator meets FMCSA physical qualification standards under part 391 of this chapter. One component of the National Registry is the registry itself, which is a national database of names and contact information for medical examiners who are certified by FMCSA to perform medical examinations of operators.

(b) A qualified VA examiner, as defined in either § 390.5 or § 390.5T, may be listed on the National Registry of Certified Medical Examiners by satisfying the requirements for medical examiner certification set forth in either § 390.103 or § 390.123.