This study evaluates health-system specialty pharmacy (HSSP) pharmacists' roles in medication discontinuations, switches, and dose changes, focusing on cost avoidance. HSSP pharmacists intervene to ensure safe and effective use of specialty medications, preventing unnecessary costs. Pharmacists successfully avoided $129,705 - $162,133 in direct costs through their interventions. These findings support the employment and role of pharmacists in HSSPs, extending beyond prescription filling.