HCPCS Level II code S9346 designates per diem administrative and professional pharmacy services for home infusion of alpha-1-proteinase inhibitor products (example: Prolastin). This code captures care coordination, pharmacy oversight, and required supplies and equipment needed to support home-based infusions while the drug product and nursing services are billed separately. Nationally, home infusion codes such as S9346 matter because they delineate non-drug professional services that support specialty biologic therapies delivered outside traditional settings, affecting site-of-care planning and payer coverage policies.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical service and site of care, typical billing structure (per diem administrative services vs. separately billed drug and nursing lines), and implications for payer coverage and claims processing. The publication also outlines benchmarks and policy considerations relevant to home infusion administration, common modifiers used on related claims, and operational notes for providers and payers handling alpha-1-proteinase inhibitor infusions in the home setting.

Data not available in the input is noted where applicable.