Summary & Overview
HCPCS S9355: Home Infusion Chelation Therapy Administration and Pharmacy Services
HCPCS Level II code S9355 identifies per diem home infusion therapy services for chelation therapy that encompass administrative management, professional pharmacy services, care coordination, and necessary supplies and equipment; drugs and nursing visits are billed separately. This code matters nationally as home infusion continues to expand for complex therapies, affecting care coordination, pharmacy management, and payer policy on bundled versus separate reimbursement for drugs and clinical visits. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will learn what S9355 represents clinically and operationally, how it is typically used in home-based chelation infusion programs, and the components captured by the per diem administrative billing. The summary notes common issues payers and providers consider, such as delineation between per diem administrative fees and separately billed drug and nursing services, implications for pharmacy coordination, and typical site-of-service considerations. Where available, the publication provides benchmarks, coding guidance, and recent policy context affecting coverage and billing practices. Data not available in the input is identified as such in relevant sections.
Billing Code Overview
HCPCS Level II code S9355 describes home infusion therapy for chelation therapy provided on a per diem basis. The code covers administrative services, professional pharmacy services, care coordination, and all necessary supplies and equipment associated with chelation infusion; the actual drugs and nursing visits are coded separately.
Service Type: Home infusion therapy — chelation services (per diem administrative and professional pharmacy management).
Typical Site of Service: Patient's home or other home-based infusion setting.
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with a history of heavy metal exposure and documented elevated blood lead level receives a home-based chelation regimen managed by a specialty infusion pharmacy. The service day includes administrative and professional pharmacy services, medication regimen review, care coordination with the treating physician, scheduling and oversight of nursing visits, supply management (infusion pumps, tubing, infusion sets), and patient education for at-home intravenous or subcutaneous chelation. Drugs (chelation agents) are billed separately and nursing visits are billed separately; the per diem S9355 covers the pharmacy administrative package and necessary supplies/equipment. Typical workflow: physician orders chelation therapy and home infusion referral; pharmacy performs clinical intake, verifies indication and allergies, coordinates delivery of chelating agent and supplies, obtains consent, trains patient/caregiver, schedules home nursing for line access and administration, monitors for adverse events, documents daily encounters, and communicates with payer and clinician regarding utilization and progress. Typical site of service is the patient’s residence (home) with coordination across home health nursing and specialty pharmacy staff. This code is used when the payer requires a per diem administrative/service fee distinct from drug and direct nursing charges.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component |