42 CFR § 485.647 - Condition of participation: psychiatric and rehabilitation distinct part units.
(a) Conditions.
(1) If a CAH provides inpatient psychiatric services in a distinct part unit, the services furnished by the distinct part unit must comply with the hospital requirements specified in subparts A, B, C, and D of part 482 of this subchapter, the common requirements of § 412.25(a)(2) through (f) of part 412 of this chapter for hospital units excluded from the prospective payment systems, and the additional requirements of § 412.27 of part 412 of this chapter for excluded psychiatric units.
(2) If a CAH provides inpatient rehabilitation services in a distinct part unit, the services furnished by the distinct part unit must comply with the hospital requirements specified in subparts A, B, C, and D of part 482 of this subchapter, the common requirements of § 412.25(a)(2) through (f) of part 412 of this chapter for hospital units excluded from the prospective payments systems, and the additional requirements of §§ 412.29 and § 412.30 of part 412 of this chapter related specifically to rehabilitation units.
(b) Eligibility requirements.
(1) To be eligible to receive Medicare payments for psychiatric or rehabilitation services as a distinct part unit, the facility provides no more than 10 beds in the distinct part unit.
(2) The beds in the distinct part are excluded from the 25 inpatient-bed count limit specified in § 485.620(a).
(3) The average annual 96-hour length of stay requirement specified under § 485.620(b) does not apply to the 10 beds in the distinct part units specified in paragraph (b)(1) of this section, and admissions and days of inpatient care in the distinct part units are not taken into account in determining the CAH's compliance with the limits on the number of beds and length of stay in § 485.620.