Use of economic predictions to make formulary decisions

The accuracy of cost savings and reimbursement predictions for medications added to an academic medical center formulary was assessed.

Formulary changes over a 5-year period were reviewed by the investigators. Medications were included if the medication was added to formulary and the monograph included cost savings or reimbursement data that indicated a positive net margin. The primary endpoints were percent predicted cost savings and net margin per medication based on medication cost only. Secondary endpoints included the percent of medications with at least 100% predicted cost savings or net margin and evaluation of median percent predicted savings or net margin individually.

The pharmacy and therapeutics committee reviewed 558 formulary agenda items, 184 of which were selected for further analysis. In total, 19 medications were identified as having a predicted monetary advantage. The endpoints of percent predicted cost savings and net margin yielded a median of 76.5% (range 72.9-188.71%) (n = 3) and 148.2% (IQR 108.9-543.3%) (n = 16), respectively. For 13 (68%) of 19 medications, the percent predicted cost savings or net margin was at least 100%.

Economic predictions utilized for formulary management at an academic medical center generated net positive monetary value for medications where predicted cost savings or reimbursement factored into the decision to add a medication to the formulary.