HCPCS Level II code S9364 represents a per diem billing code for home infusion total parenteral nutrition (TPN) that bundles administrative services, professional pharmacy services, care coordination, and required supplies and equipment including standard TPN formulas. As home-based complex nutrition support expands, S9364 matters nationally because it captures comprehensive pharmacy and administrative components of TPN care delivered outside institutional settings. Key payers in national analyses include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

This publication provides readers with a concise overview of what S9364 covers, how it is used in home infusion programs, and the implications for billing workflows and benefit design. Readers will find benchmark context for per diem TPN administration and pharmacy services, discussion of payer coverage patterns, and relevant policy considerations affecting home infusion reimbursement. The content also outlines what elements are included in the per diem bundle and which services (such as nursing visits or separately billed drugs) are typically billed outside this code. Data not available in the input is clearly noted where applicable.