Summary & Overview
HCPCS S9590: Home Irrigation Therapy, Per Diem
HCPCS Level II code S9590 designates per diem home irrigation therapy services, encompassing sterile irrigation of an organ or anatomical cavity along with administrative support, professional pharmacy services, care coordination, and required supplies and equipment. This code is relevant nationally as payers and care managers increasingly support complex home-based procedures that reduce facility utilization and support patient-centered care.
Key payers included in national coverage discussions are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for home irrigation therapy, typical billing constructs where drugs and nursing visits are billed separately, and the payer landscape addressing per diem bundled billing for home-based procedural care.
The publication provides benchmarks for utilization and reimbursement frameworks, notes common modifier usage where available, and summarizes policy and coverage considerations that affect authorization and coding practice for home therapy services. It also highlights operational elements—such as inventorying supplies, coordinating professional pharmacy services, and documenting administrative components—that are central to accurate use of S9590. Data not available in the input is noted where specific payer policies, taxonomies, and diagnosis mappings are required.
Billing Code Overview
HCPCS Level II code S9590 describes home therapy for irrigation therapy, defined as sterile irrigation of an organ or anatomical cavity provided in the home setting. The code includes administrative services, professional pharmacy services, care coordination, and all necessary supplies and equipment required for the irrigation therapy on a per diem basis. Drugs and nursing visits related to the therapy are coded separately.
Service Type: Home-based irrigation therapy with integrated administrative and pharmacy services
Typical Site of Service: Patient's home
Clinical & Coding Specifications
Clinical Context
A typical patient is a 68-year-old with neurogenic bladder and recurrent urinary retention who is transitioned from hospital to a home health program for ongoing sterile bladder irrigation therapy. The patient previously underwent inpatient management with catheter irrigation after gross hematuria following transurethral resection of the prostate. At discharge, the urologist orders daily home therapy irrigation to maintain catheter patency and clear clots. A home infusion/pharmacy provider arranges supplies and coordinates nursing visits; a registered nurse performs in-home sterile irrigation, documents volumes and appearance, educates the patient/caregiver on signs of infection and catheter care, and communicates changes to the supervising physician.
The clinical workflow includes: referral from hospital or clinic to a home care vendor, prior authorization and benefit verification with payors, pharmacy and nursing scheduling, delivery of irrigation kits and equipment, initial nursing visit for assessment and first irrigation, subsequent per-diem nursing or device-based therapy under the S9590 per diem service, periodic physician follow-up (telehealth or clinic) for therapy efficacy, and documentation of adverse events or need for escalation (e.g., return to facility for hematuria management).
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component |