(a) General rule. For discharges occurring on or after October 1, 2020, the amount of payment for a discharge described in paragraph (b) of this section is adjusted as described in paragraph (c) of this section.

(b) Discharges subject to payment adjustment. Payment is adjusted in accordance with paragraph (c) of this section for discharges assigned to MS-DRG 018 involving expanded access use of immunotherapy or that are part of an applicable clinical trial as determined by CMS based on the reporting of a diagnosis code indicating the encounter is part of a clinical research program on the claim for the discharge or, for discharges occurring on or after October 1, 2025, other cases where the immunotherapy product is not purchased in the usual manner, such as provided at no cost.

(c) Adjustment. The DRG weighting factor determined under § 412.60(b) is adjusted by a factor that reflects the average cost for cases assigned to MS-DRG 018 that involve expanded access use of immunotherapy, are part of an applicable clinical trial, or where the immunotherapy product is not purchased in the usual manner, such as provided at no cost, to the average cost for all other cases assigned to MS-DRG 018.