29 C.F.R. § 2590.736
Sections 2590.701-1 through 2590.701-8 and 2590.731 through 2590.736 are applicable for plan years beginning on or after July 1, 2005. Notwithstanding the previous sentence, for short-term, limited-duration insurance sold or issued on or after September 1, 2024, the definition of short-term, limited-duration insurance in § 2590.701-2 applies for coverage periods beginning on or after September 1, 2024. For short-term, limited-duration insurance sold or issued before September 1, 2024 (including any subsequent renewal or extension consistent with applicable law), the definition of short-term, limited-duration insurance in 29 CFR 2590.701-2 , revised as of July 1, 2023, continues to apply, except that paragraph (1)(ii) of the definition of short-term, limited-duration insurance in § 2590.701-2 applies for coverage periods beginning on or after September 1, 2024.
29 C.F.R. §2590.736