Summary & Overview
HCPCS A4408: Extended-Wear Ostomy Skin Barrier with Built-In Convexity, Large
HCPCS Level II code A4408 designates an extended-wear ostomy skin barrier with a flange and built-in convexity, sized larger than 4 x 4 inches, billed per unit. These barriers are used to protect peristomal skin and secure ostomy pouches for patients with stomas, particularly when a convex profile is needed to achieve a reliable seal.
Nationally, ostomy supplies like those described by A4408 are clinically important for maintaining skin integrity, preventing leakage, and supporting patient quality of life. Coverage and coding clarity for large, convex, extended-wear skin barriers affect procurement, clinical supply management, and episode-of-care costs across payers.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical role and billing context, payer coverage considerations, common modifiers that may accompany durable medical supply billing (listed separately), and where to find additional policy or reimbursement detail. The publication also outlines benchmarks and policy updates affecting ostomy supply reimbursement, practical coding notes for billing staff, and links to payer policy resources when available.
Billing Code Overview
HCPCS Level II code A4408 describes an ostomy skin barrier with flange that is extended wear, includes built-in convexity, and is larger than 4 x 4 inches. The item may be solid, flexible, or accordion in design and is billed each.
Service type: Ostomy supply / wound care appliance
Typical site of service: Home health, outpatient clinics, long-term care facilities, or other sites where ostomy supplies are used by patients with stomas
Clinical & Coding Specifications
Clinical Context
A 72-year-old patient with a permanent end colostomy following abdominoperineal resection presents for routine ostomy appliance management. The clinician assesses peristomal skin integrity, stoma protrusion, and fit of the skin barrier. The patient reports intermittent leakage and erythema under the barrier. A larger, extended-wear ostomy skin barrier with built-in convexity is selected to improve seal and protect irritated peristomal skin. The nursing or wound-ostomy-continence (WOC) nurse measures the stoma, documents need for a barrier larger than 4 x 4 inches, educates the patient on application and wear schedule, and dispenses a single barrier coded as A4408 for the current service. Typical workflow includes evaluation of the stoma and peristomal skin, selection of the appropriate convex barrier due to retracted or flush stoma, patient education, and documentation of medical necessity, quantity, and any supplier or payer-specific requirements.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
11 | Primary procedure | When A4408 is the primary item provided during the encounter |
26 |