Drugs administered aside from by oral methodology. Drugs administered other than by oral technique provided on an outpatient basis by hospitals are paid on the identical basis as medicine administered other than by oral methodology covered by the allowable cost technique underneath paragraph of this section. Oxygen and related provides supplied on an outpatient foundation by hospitals are paid on the same basis as oxygen and related supplies covered by the allowable cost methodology beneath paragraph of this section. All different hospitals and models lined by the CHAMPUS mental health per diem cost system shall be thought-about decrease quantity hospitals. The base interval for calculating the hospital-specific and regional per diems, as described in paragraphs and of this part, is Federal fiscal year 1988. Base interval calculations shall be primarily based on actual claims paid through the period July 1, 1987 by way of May 31, 1988, trended ahead to represent the 12-month interval ending September 30, 1988 on the premise of the Medicare inpatient hospital market basket price.