HCPCS Level II code S9501 designates per-diem administrative and professional pharmacy services for home infusion of antibiotics, antivirals, or antifungals administered every 12 hours. The code is distinct from drug and nursing visit charges, which are billed separately, and it captures care coordination, supplies, and equipment necessary to support twice-daily home infusion regimens. This code matters nationally as home infusion expands as a site-of-care alternative to inpatient and outpatient infusion centers, affecting access, cost management, and coordination across pharmacy and home health services.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the service the code represents, typical sites of service, and the scope of what S9501 bundles versus items billed separately. The publication outlines relevant benchmarks and payment considerations, summarizes policy updates impacting home infusion administration reimbursement, and provides clinical context for when twice-daily antimicrobial regimens require dedicated administrative and pharmacy support. The report also highlights common billing modifiers and data limitations where input fields were not available. Intended audiences include coding professionals, payers, pharmacy and home health administrators, and policy analysts seeking a concise reference for billing, coverage, and operational planning related to home infusion services.