Summary & Overview
HCPCS A4418: Ostomy pouch, closed with filter
HCPCS Level II code A4418 identifies a single-use closed ostomy pouch without an attached barrier that includes a filter. The code matters nationally because ostomy supplies are essential for post-surgical management, chronic ostomy care, and home-based continuing care. Coverage and reimbursement for these supplies affect access, out-of-pocket costs, and care continuity for people living with an ostomy.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what A4418 represents, common sites of service, and payer landscape considerations. The publication summarizes typical supply classification and service contexts, highlights benchmark and coverage themes where available, and outlines clinical context relevant to ostomy pouch use.
This resource is intended for billing staff, supply chain managers, clinicians involved in ostomy care, and policy analysts seeking a national view of coding and payer considerations for closed ostomy pouches with filters. Data not available in the input is identified where applicable.
Billing Code Overview
HCPCS Level II code A4418 denotes an ostomy pouch, closed; without barrier attached, with filter (1 piece), each. This item is a single-use closed ostomy pouch designed to collect effluent from a surgically created stoma and includes an integrated filter to manage gas and odor.
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Service type: Durable medical/supply item for ostomy care
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Typical site of service: Outpatient settings, home health, and retail medical supply outlets
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with a permanent or temporary intestinal stoma who requires routine ostomy pouching supplies. The product described by A4418 is a single-piece, closed ostomy pouch without an integrated skin barrier and with a filter to allow gas release. Common scenarios include outpatient supply refills for patients with colostomies following low anterior resection, abdominoperineal resection, or traumatic bowel injury, and home health visits for patients who are ambulatory but need ongoing pouch changes. The clinical workflow begins with an evaluation by a wound, ostomy, and continence nurse (WOCN) or outpatient clinician to assess stoma size, peristomal skin condition, and pouching needs. A prescription/order specifying pouch type (A4418), quantity, and frequency is generated. Durable medical equipment (DME) or medical supply vendors dispense the pouch in the home or clinic setting. Education on application, disposal of the closed pouch after use, and troubleshooting for leakage or odor management is provided during the visit or via home health nursing. Billing is submitted by the supplier to the patient’s payor with the appropriate modifier(s) reflecting the circumstance of the supply delivery or provider relationship.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier — default |