Section 171.101 - Applicability(a) This part applies to health care providers, health IT developers of certified health IT, health information exchanges, and health information networks, as those terms are defined in § 171.102 .(b) Health care providers, health IT developers of certified health IT, health information exchanges, and health information networks are subject to this part on and after April 5, 2021. 85 FR 25955 , May 1, 2020, as amended at 85 FR 70085 , Nov. 4, 2020 85 FR 25955, 6/30/2020; as amended at 85 FR 70085, 11/4/2020