Summary & Overview
HCPCS S9373: Home Infusion Hydration Administrative and Pharmacy Services
HCPCS Level II code S9373 represents per diem administrative and professional pharmacy services associated with home hydration infusion therapy, including care coordination and necessary supplies and equipment; drugs and nursing visits are billed separately. The code matters nationally as home infusion expands as an alternative to facility-based care, influencing utilization of pharmacy and care-coordination resources and affecting insurer coverage policies for home-based hydration services. Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will learn the clinical scope of S9373, typical billing context (per diem administrative services separate from drug and nursing charges), common payer coverage considerations, and areas where policy clarity matters—such as bundling rules with nursing and drug line items and restrictions related to hydration codes that use daily volume scales. The summary highlights benchmarking and policy implications generally rather than jurisdiction-specific rules. Data not available in the input is noted where applicable in detailed sections of the publication.
Billing Code Overview
HCPCS Level II code S9373 describes home infusion therapy, hydration therapy administrative services. The code covers professional pharmacy services, care coordination, and all necessary supplies and equipment (with drugs and nursing visits billed separately), reported on a per diem basis. The description notes that S9373 should not be used with hydration therapy codes S9374–S9377 that utilize daily volume scales.
Service type: Home infusion administrative and care coordination services for hydration therapy.
Typical site of service: Patient’s home.
Clinical & Coding Specifications
Clinical Context
A 68-year-old patient with chronic heart failure and symptomatic dehydration is discharged from the hospital but requires ongoing parenteral hydration at home. The patient receives home infusion services where the pharmacy coordinates daily administrative services, professional pharmacy oversight, care coordination, and delivery of all necessary non-drug supplies and durable equipment. Intravenous fluids are prepared and shipped by the pharmacy (drugs billed separately) and nursing visits for line care and infusion setup are scheduled per diem. The clinical workflow includes physician order for home hydration, pharmacy review and compounding of fluids, insurance prior authorization and authorization of per diem administrative services billed with S9373, nurse home visit for catheter access and infusion initiation, ongoing monitoring and documentation by nursing and pharmacy, and periodic physician follow-up visits to assess response and complications. Documentation elements include physician orders, medication administration record, infusion volume and rate, supply/equipment inventory, nursing notes, care coordination logs, and justification for daily administrative per diem billing when hydration drug codes S9374–S9377 are not used.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 |