; or (B) is in the same practice (as determined by tax identification number) of a physician or practitioner (as so defined) who furnished such an item or service to such individual during such period. . (3) Implementation The Secretary of Health and Human Services may implement the amendments made by this subsection by program instruction or otherwise. (b) Clarification of definitions of emergency area and emergency period Paragraph (1) of section 1135(g) of the Social Security Act ( 42 U.S.C. 1320b–5(g) ) is amended to read as follows: (1) Emergency area; emergency period (A) In general Subject to subparagraph (B), an emergency area is a geographical area in which, and an emergency period is the period during which, there exists— (i) an emergency or disaster declared by the President pursuant to the National Emergencies Act or the Robert T. Stafford Disaster Relief and Emergency Assistance Act; and (ii) a public health emergency declared by the Secretary pursuant to section 319 of the Public Health Service Act. (B) Exception For purposes of subsection (b)(8), an emergency area is a geographical area in which, and an emergency period is the period during which, there exists— (i) the public health emergency declared by the Secretary pursuant to section 319 of the Public Health Service Act on January 31, 2020, entitled Determination that a Public Health Emergency Exists Nationwide as the Result of the 2019 Novel Coronavirus