Section 412.20 - Hospital services subject to the prospective payment systems(a) Except for services described in paragraphs (b), (c), (d), and (e) of this section, all covered hospital inpatient services furnished to beneficiaries during the subject cost reporting periods are paid under the prospective payment system as specified in § 412.1(a)(1) .(b) Effective for cost reporting periods beginning on or after January 1, 2005, covered inpatient hospital services furnished to Medicare beneficiaries by an inpatient psychiatric facility that meets the conditions of § 412.404 are paid under the prospective payment system described in subpart N of this part.(c)(1) Effective for cost reporting periods beginning on or after January 1, 2002, covered inpatient hospital services furnished to Medicare beneficiaries by a rehabilitation hospital or rehabilitation unit that meet the conditions of § 412.604 are paid under the prospective payment system described in subpart P of this part.(2) CMS will not pay for services under subpart P of this part if the services are paid for by a health maintenance organization (HMO) or competitive medical plan (CMP) that elects not to have CMS make payments to an inpatient rehabilitation facility for services, which are inpatient hospital services, furnished to the HMO's or CMP's Medicare enrollees, as provided under part 417 of this chapter.(d) Effective for cost reporting periods beginning on or after October 1, 2002, covered inpatient hospital services furnished to Medicare beneficiaries by a long-term care hospital that meets the conditions for payment of §§ 412.505 through 412.511 are paid under the prospective payment system described in subpart O of this part.(e) Inpatient hospital services will not be paid under the prospective payment systems specified in § 412.1(a)(1) under any of the following circumstances: (1) The services are furnished by a hospital (or hospital unit) explicitly excluded from the prospective payment systems under §§ 412.23 , 412.25 , 412.27 , and 412.29 .(2) The services are emergency services furnished by a nonparticipating hospital in accordance with § 424.103 of this chapter.(3) The services are paid for by an HMO or competitive medical plan (CMP) that elects not to have CMS make payments directly to a hospital for inpatient hospital services furnished to the HMO's or CMP's Medicare enrollees, as provided in §§ 417.240(d) and 417.586 of this chapter.50 FR 12741, Mar. 29, 1985, as amended at 53 FR 6648, Mar. 2, 1988; 57 FR 39820, Sept. 1, 1992; 59 FR 45400, Sept. 1, 1994; 66 FR 41386 , Aug. 7, 2001; 67 FR 56048 , Aug. 30, 2002; 68 FR 45698 , Aug. 1, 2003; 69 FR 66976 , Nov. 15, 2004