Summary & Overview
HCPCS Level II A4423: Closed Ostomy Pouch with Locking Flange and Filter
HCPCS Level II code A4423 identifies a closed ostomy pouch intended for use with a barrier that has a locking flange and includes a filter. This supply-level code captures a common component of ostomy management used by patients with fecal or urinary diversions. Nationally, accurate coding of ostomy supplies affects access to appropriate supplies, benefit coverage determinations, and durable medical equipment spending patterns.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical role, the typical sites where the pouch is used, and the payer landscape addressed. The publication summarizes benchmark considerations for supply utilization and coverage, highlights coding context that influences claims adjudication, and outlines the clinical context for ostomy pouch selection and use.
This summary is intended to orient clinicians, billing staff, and policy analysts to the purpose of A4423, what to expect in payer coverage discussions, and which operational and clinical factors commonly shape reimbursement and supply management decisions. Data not available in the input are noted where applicable.
Billing Code Overview
HCPCS Level II code A4423 describes an ostomy pouch, closed; for use on barrier with locking flange, with filter (2 piece), each. This item is a single-use disposable ostomy pouch designed for attachment to a locking flange barrier system and includes an integrated filter to manage gas and odor.
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Service type: Durable medical/supply item for ostomy management
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Typical site of service: Home, outpatient clinics, long-term care facilities, or other non-acute settings where ostomy supplies are used
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with a long-standing colostomy presents to outpatient durable medical equipment (DME) services for routine supplies. The patient uses a two-piece ostomy system with a locking flange and requires closed ostomy pouches with integrated filters to manage effluent and control odors. The typical clinical workflow begins with an order from the treating provider (often a colorectal surgeon, general surgeon, or wound/ostomy nurse practitioner) specifying supply type and frequency. The DME supplier verifies the prescription, confirms payer coverage and medical necessity, selects appropriate pouch size and filter type, and dispenses individual A4423 units (closed pouch, two-piece, with filter). Education on application, seal care, and disposal is provided by the wound and ostomy nurse, and follow-up orders are issued at routine postoperative or stoma-care visits. Typical site of service is outpatient DME supplier or home delivery; supplies are worn in the community and changed by the patient or caregiver at home.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
NU | New equipment | When the pouch is first provided as new equipment for a new ostomy patient |
RR |