Summary & Overview
HCPCS S9504: Home Infusion Therapy Per Diem for Anti-Infective Pharmacy Services
HCPCS Level II code S9504 represents a per diem administrative and professional pharmacy service for home infusion therapy of antibiotics, antivirals, or antifungals provided once every four hours. The code bundles care coordination, administrative oversight, professional pharmacy activities, and necessary supplies and equipment for home-based infusion, while the drugs themselves and nursing visits are billed separately. Nationally, this code matters because it standardizes billing for non-drug, non-nursing elements of home infusion programs that are expanding as outpatient and home-based care grows.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical and billing scope of S9504, payer coverage patterns and benchmarking context where available, and guidance on common billing components tied to the per diem administrative service. The publication also outlines typical sites of service and service type to support correct claim placement and coding workflows. Data not available in the input is noted where applicable; the content focuses on the code definition, clinical context, and what to expect when S9504 is billed alongside separately coded drugs and nursing services.
Billing Code Overview
HCPCS Level II code S9504 describes a home infusion therapy per diem administrative and professional pharmacy service for antibiotic, antiviral, or antifungal medications provided once every four hours. The code covers administrative services, professional pharmacy services, care coordination, and all necessary supplies and equipment associated with home infusion therapy; the actual drugs and nursing visits are coded separately.
Service type: Home infusion therapy — professional and administrative per diem services
Typical site of service: Patient home
Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes.
Clinical & Coding Specifications
Clinical Context
A 67-year-old patient with a history of chronic obstructive pulmonary disease and recurrent community-acquired pneumonia is discharged from the hospital to continue intravenous antibiotic therapy at home. The patient requires an IV antibiotic administered every four hours via a peripherally inserted central catheter (PICC) and receives oversight by a home infusion pharmacy and visiting nursing service. The home infusion per diem administrative service covers professional pharmacy services, care coordination, supplies, and equipment; the actual drug is billed separately and nursing visits or catheter care are billed under separate nursing or procedure codes.
Clinical workflow:
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Hospital or outpatient clinician prescribes a home infusion antibiotic with frequency "every 4 hours."
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The home infusion pharmacy receives the order, performs clinical review, compounds or dispenses the medication, and arranges delivery.
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A visiting nurse performs home setup, catheter access, infusion initiation training for patient/caregiver, and periodic nursing visits as clinically indicated (nursing billed separately).
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The home infusion provider bills the per diem administrative service
S9504to cover coordination, pharmacy professional services, sterile supplies, and equipment; the medication and nursing visits are billed using their respective drug and service codes. -
Ongoing monitoring includes care coordination calls, lab monitoring arranged by the ordering clinician, and documentation of infusion tolerance and catheter site assessments in the home health record.