Summary & Overview
HCPCS Level II S9353: Home Infusion Continuous Insulin Infusion, Per Diem
HCPCS Level II code S9353 represents per diem administrative and professional pharmacy services for continuous insulin infusion provided in the home setting, including care coordination and all necessary supplies and equipment (with drugs and nursing visits billed separately). This code matters nationally as home infusion for insulin pumps supports outpatient diabetes management, reduces inpatient utilization, and involves multidisciplinary coordination between pharmacists, durable medical equipment suppliers, and home health providers. Key payers analyzed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will learn the clinical and billing context for S9353, typical sites of service and service components, common modifiers and billing considerations, and how this per diem code interfaces with separately billed drug and nursing services. The publication summarizes typical use cases, payer coverage considerations, and operational implications for home infusion programs. Data not available in the input will be noted where applicable.
Billing Code Overview
HCPCS Level II code S9353 describes home infusion therapy for continuous insulin infusion and covers administrative services, professional pharmacy services, care coordination, and all necessary supplies and equipment billed on a per diem basis. Drugs and nursing visits are coded separately under their respective billing codes.
Service type: Home infusion therapy — continuous insulin infusion, per diem administrative and coordination services
Typical site of service: Patient's home (home health/home infusion setting)
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with insulin-requiring diabetes mellitus (for example, brittle type 1 diabetes or insulin-refractory type 2 diabetes) who requires continuous subcutaneous insulin infusion delivered at home via an insulin pump with professional pharmacy oversight and care coordination. The insurer-authorized home infusion program provides per diem administrative services, professional pharmacy management (dosage adjustment, medication reconciliation, patient education), coordination of nursing visits for device setup and troubleshooting, and delivery of infusion supplies and pump equipment; insulin drug charges and nursing visit billings are coded separately.
A realistic workflow: the patient is discharged from the hospital after diabetic ketoacidosis or frequent hypoglycemia on multiple daily injections. The hospital endocrinology team arranges home infusion services. A pharmacy specializing in home infusion verifies the insulin prescription, establishes the pump program, delivers pump and supplies to the patient’s home, and arranges the initial home nursing visit for pump teaching and insertion of infusion set. The pharmacist provides remote dose titration and monitoring; care coordination occurs with the ordering endocrinologist and the patient’s primary care provider. Subsequent per diem billing under S9353 covers ongoing administrative and professional pharmacy services and supplies, while the insulin product and each nursing visit are billed separately under the appropriate HCPCS/CPT or drug codes. Typical site of service is the patient’s residence (home) with occasional services provided in the outpatient clinic for evaluation or pump changes.
Coding Specifications
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