; and (B) partners with public and private stakeholders to facilitate the provision of dental services for underserved populations. ; and (3) in subsection (h), as redesignated by paragraph (1), by striking fiscal years 2001 through 2005 and inserting fiscal years 2016 through 2020 . 4003. Critical access hospital improvements (a) Elimination of isolation test for cost-Based ambulance reimbursement (1) In general Section 1834(l)(8) of the Social Security Act ( 42 U.S.C. 1395m(l)(8) ) is amended— (A) in subparagraph (B)— (i) by striking owned and ; and (ii) by inserting (including when such services are provided by the entity under an arrangement with the hospital) after hospital ; and (B) by striking the comma at the end of subparagraph (B) and all that follows and inserting a period. (2) Effective date The amendments made by this subsection shall apply to services furnished on or after January 1, 2019. (b) Provision of a more flexible alternative to the CAH designation 25 inpatient bed limit requirement (1) In general Section 1820(c)(2) of the Social Security Act ( 42 U.S.C. 1395i–4(c)(2) ) is amended— (A) in subparagraph (B)(iii), by striking provides not more than and inserting subject to subparagraph (F), provides not more than