Section 412.130 - Retroactive adjustments for incorrectly excluded hospitals and units(a)Hospitals for which adjustment is made. The intermediary makes the payment adjustment described in paragraph (b) of this section for the following hospitals: (1) A hospital that was excluded from the prospective payment systems specified in § 412.1(a)(1) or paid under the prospective payment system specified in § 412.1(a)(3) , as a new rehabilitation hospital for a cost reporting period beginning on or after October 1, 1991 based on a certification under § 412.29(c) regarding the inpatient population the hospital planned to treat during that cost reporting period, if the inpatient population actually treated in the hospital during that cost reporting period did not meet the requirements of § 412.29(b) .(2) A hospital that has a unit excluded from the prospective payment systems specified in § 412.1(a)(1) or paid under the prospective payment system specified in § 412.1(a)(3) , as a new rehabilitation unit for a cost reporting period beginning on or after October 1, 1991, based on a certification under § 412.29(c) regarding the inpatient population the hospital planned to treat in that unit during the period, if the inpatient population actually treated in the unit during that cost reporting period did not meet the requirements of § 412.29(b) .(3) A hospital that added new beds to its existing rehabilitation unit for a cost reporting period beginning on or after October 1, 1991 based on a certification under § 412.29(c) regarding the inpatient population the hospital planned to treat in these new beds during that cost reporting period, if the inpatient population actually treated in the new beds during that cost reporting period did not meet the requirements of § 412.29(b) .(b)Adjustment of payment.(1) For cost reporting periods beginning before January 1, 2002, the intermediary adjusts the payment to the hospitals described in paragraph (a) of this section as follows: (i) The intermediary calculates the difference between the amounts actually paid during the cost reporting period for which the hospital, unit, or beds were first excluded as a new hospital, new unit, or newly added beds under subpart B of this part, and the amount that would have been paid under the prospective payment systems specified in § 412.1(a)(1) for services furnished during that period.(ii) The intermediary makes a retroactive adjustment for the difference between the amount paid to the hospital based on the exclusion and the amount that would have been paid under the prospective payment systems specified in § 412.1(a)(1) .(2) For cost reporting periods beginning on or after January 1, 2002, the intermediary adjusts the payment to the hospitals described in paragraph (a) of this section as follows: (i) The intermediary calculates the difference between the amounts actually paid under subpart P of this part during the cost reporting period for which the hospital, unit, or beds were first classified as a new hospital, new unit, or newly added beds under subpart B of this part, and the amount that would have been paid under the prospective payment systems specified in § 412.1(a)(1) for services furnished during that period.(ii) The intermediary makes a retroactive adjustment for the difference between the amount paid to the hospital under subpart P of this part and the amount that would have been paid under the prospective payment systems specified in § 412.1(a)(1) .56 FR 43241, Aug. 30, 1991, as amended at 57 FR 39825, Sept. 1, 1992; 59 FR 45400, Sept. 1, 1994; 60 FR 45848, Sept. 1, 1995; 66 FR 41387 , Aug. 7, 2001; 70 FR 66977 , Nov. 15, 2005; 78 FR 47934 , Aug. 6, 2013