Section 170.401 - Information blocking(a)Condition of Certification requirement. A health IT developer must not take any action that constitutes information blocking as defined in 42 U.S.C. 300jj-52 and § 171.103 on or after April 5, 2021. 85 FR 25945 , May 1, 2020, as amended at 85 FR 70084 , Nov. 4, 2020 85 FR 25945, 6/30/2020; as amended at 85 FR 70084, 11/4/2020