fully applicable for specified OPD services beginning with 2028. (iv) Definitions For purposes of this subparagraph: (I) Designated ambulatory payment classification group The term designated ambulatory payment classification group means an ambulatory payment classification group for drug administration services. (II) Specified OPD services defined The term specified OPD services means covered OPD services included in a designated ambulatory payment classification group. (III) Off-campus outpatient department of a provider defined The term off-campus outpatient department of a provider means a department of a provider (as defined in section 413.65(a)(2) of title 42, Code of Federal Regulations) that is not located— (aa) on the campus (as such term is defined in such section 413.65(a)(2)) of such provider