; and (B) in subparagraph (B), by striking occurring during the period described in subsection (a) and inserting occurring during a fiscal quarter . (b) Effective date The amendments made by subsection (a) shall take effect as if included in the enactment of the American Rescue Plan Act of 2021 ( Public Law 117–2 ). 402. Revisions to the IMD exclusion under Medicaid (a) Shrinking of the IMD exclusion under Medicaid Section 1905(a)(1) of the Social Security Act ( 42 U.S.C. 1396d(a)(1) ) is amended by inserting , except for, services that, beginning the day after the date of the enactment of the 9–8–8 National Suicide Prevention Lifeline Implementation Act of 2022, are furnished in psychiatric acute care crisis beds administered by community behavioral health organizations certified under section 223 of the Protecting Access to Medicare Act of 2014, mental health centers that meet the criteria of section 1913(c) of the Public Health Service Act, crisis receiving and stabilization facilities, and the mental health and substance use urgent care facilities . (b) Guidance relating to IMD exclusion Not later than 180 days after the date of the enactment of this Act, the Secretary of Health and Human Services shall issue guidance that crisis stabilization units (as described in section 1905(a)(1) of the Social Security Act ( 42 U.S.C. 1396d(a)(1) ) are excluded from the prohibition specified in the parenthetical of paragraph (1) of section 1905(a) (relating to services in an institution for mental diseases), including the following facilities and services: (1) Subacute crisis receiving in inpatient or other facilities specified by the Secretary that provide short-term observation for all referrals to individuals in severe distress, as further defined by the Secretary, with up to 23 consecutive hours of supervised care to assist with deescalating the severity of a mental health or substance use crisis or need for urgent care in a sub-acute inpatient setting. (2) Short term crisis stabilization services assisting with