42 CFR § 441.58 - Periodicity schedule.
The agency must implement a periodicity schedule for screening services that -
(a) Meets reasonable standards of medical and dental practice determined by the agency after consultation with recognized medical and dental organizations involved in child health care;
(b) Specifies screening services applicable at each stage of the beneficiary's life, beginning with a neonatal examination, up to the age at which an individual is no longer eligible for EPSDT services; and
(c) At the agency's option, provides for needed screening services as determined by the agency, in addition to the otherwise applicable screening services specified under paragraph (b) of this section.