Subject to paragraphs (4) and (5), in the case of occupational therapy services (of the type that are described in section 1395x(p) of this title (but (except as provided in paragraph (6)) not described in subsection (a)(8)(B)) through the operation of section 1395x(g) of this title and of such type which are furnished by a physician or as incident to physicians’ services), with respect to expenses incurred in any calendar year, no more than the amount specified in paragraph (2) for the year shall be considered as incurred expenses for purposes of subsections (a) and (b). The preceding sentence shall not apply to expenses incurred with respect to services furnished after December 31, 2017 .

With respect to services furnished during 2018 or a subsequent year, in the case of occupational therapy services (of the type that are described in section 1395x(p) of this title through the operation of section 1395x(g) of this title and of such type which are furnished by a physician or as incident to physicians’ services), with respect to expenses incurred in any calendar year, any amount that is more than the amount specified in paragraph (2) for the year shall not be considered as incurred expenses for purposes of subsections (a) and (b) unless the applicable requirements of paragraph (7) are met.