; and (iii) results in an order for or administration of a diagnostic test described in section 1852(a)(1)(B)(iv)(IV). (B) Categories of HCPCS codes For purposes of subparagraph (A), the categories of HCPCS evaluation and management services codes are the following: (i) Office and other outpatient services. (ii) Hospital observation services. (iii) Emergency department services. (iv) Nursing facility services. (v) Domiciliary, rest home, or custodial care services. (vi) Home services. (2) Specified outpatient payment provision A specified outpatient payment provision described in this paragraph is any of the following: (A) The hospital outpatient prospective payment system under subsection (t). (B) The physician fee schedule under section 1848. (C) The prospective payment system developed under section 1834(o). (D) Section 1834(g), with respect to an outpatient critical access hospital service. (E) The payment basis determined in regulations pursuant to section 1833(a)(3) for rural health clinic services. . (b) Claims modifier The Secretary of Health and Human Services shall provide for an appropriate modifier (or other identifier) to include on claims to identify, for purposes of subparagraph (DD) of section 1833(a)(1), as added by subsection (a), specified COVID–19 testing-related services described in paragraph (1) of section 1833(cc) of the Social Security Act, as added by subsection (a), for which payment may be made under a specified outpatient payment provision described in paragraph (2) of such subsection. (c) Implementation Notwithstanding any other provision of law, the Secretary of Health and Human Services may implement the provisions of, including amendments made by, this section through program instruction or otherwise. 4. Coverage of testing for COVID–19 at no cost sharing under the Medicare Advantage program (a) In general Section 1852(a)(1)(B) of the Social Security Act ( 42 U.S.C. 1395w–22(a)(1)(B) ) is amended— (1) in clause (iv)— (A) by redesignating subclause (IV) as subclause (VI)