; (2) in the third sentence, by inserting , nurse practitioner, clinical nurse specialist, certified nurse-midwife, or physician assistant (as the case may be) after physician; (3) in the fourth sentence— (A) by striking physician certification and inserting certification ; (B) by inserting (or on January 1, 2018, in the case of regulations to implement the amendments made by section 2 of the Home Health Care Planning Improvement Act of 2017 ) after 1981 ; and (C) by striking a physician who and inserting a physician, nurse practitioner, clinical nurse specialist, certified nurse-midwife, or physician assistant who ; and (4) in the fifth sentence, by inserting , nurse practitioner, clinical nurse specialist, certified nurse-midwife, or physician assistant after physician . (c) Definition provisions (1) Home health services Section 1861(m) of the Social Security Act ( 42 U.S.C. 1395x(m) ) is amended— (A) in the matter preceding paragraph (1)— (i) by inserting , a nurse practitioner or a clinical nurse specialist (as those terms are defined in subsection (aa)(5)), a certified nurse-midwife (as defined in section 1861(gg)), or a physician assistant (as defined in subsection (aa)(5)) after physician the first place it appears; and (ii) by inserting , a nurse practitioner, a clinical nurse specialist, a certified nurse-midwife, or a physician assistant after physician the second place it appears; and (B) in paragraph (3), by inserting , a nurse practitioner, a clinical nurse specialist, a certified nurse-midwife, or a physician assistant after physician . (2) Home health agency Section 1861(o)(2) of the Social Security Act ( 42 U.S.C. 1395x(o)(2) ) is amended— (A) by inserting , nurse practitioners or clinical nurse specialists (as those terms are defined in subsection (aa)(5)), certified nurse-midwives (as defined in section 1861(gg)), or physician assistants (as defined in subsection (aa)(5)) after physicians