Summary & Overview
HCPCS A4371: Ostomy Skin Barrier Powder, Per Ounce
HCPCS Level II code A4371 represents an ostomy skin barrier powder, billed per ounce, used to protect peristomal skin and manage leakage or irritation around ostomy sites. This supply code is important nationally because ostomy supplies are essential for long-term care, home-based management, and quality-of-life outcomes for patients with intestinal or urinary stomas. Coverage and payment for ostomy supplies affect access to necessary self-care products and can influence overall post-acute and home health costs.
Key payers included in this analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical role of the item, typical sites of service, and the payer landscape addressed. The publication outlines benchmarks where available, common billing considerations, and recent policy or coding updates relevant to durable medical equipment and disposable ostomy supplies.
This material provides clinicians, billing professionals, and policy staff with the context needed to understand where A4371 fits in supply management protocols and payer coverage frameworks, and what to review when confirming coverage or documentation for ostomy skin barrier powders. Data not available in the input will be noted where applicable.
Billing Code Overview
HCPCS Level II code A4371 describes an ostomy skin barrier in powder form, billed per ounce. The service relates to supplies used to manage and protect peristomal skin for patients with ostomies. The service type is durable medical/surgical supply for ostomy care. The typical site of service is outpatient settings, home health, or the patient's residence where ostomy supplies are applied and maintained.
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Clinical & Coding Specifications
Clinical Context
A typical patient is an adult or pediatric ostomy recipient who requires topical powder to manage peri-stomal skin irritation, leakage-related moisture, or excoriation under an ostomy skin barrier. The clinical workflow begins with a wound- or ostomy-care nurse assessing the stoma and peri‑stomal skin during an outpatient clinic visit, home health visit, or long‑term care nursing assessment. When peri‑stomal skin shows maceration, granulation tissue, or persistent weeping that interferes with appliance adhesion, the clinician documents the skin findings, records the ostomy type (ileostomy, colostomy, urostomy), and selects an ostomy skin barrier powder to absorb moisture and protect the skin prior to applying a new skin barrier or pouching system. The item A4371 (ostomy skin barrier, powder, per oz) is dispensed in appropriate quantity, and documentation includes diagnosis code(s) supporting medical necessity, supplier details, quantity dispensed, and patient education on application and pouching technique. Typical sites of service include outpatient wound/ostomy clinics, home health visits, durable medical equipment suppliers, and skilled nursing facilities.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier | Use when no specific modifier applies and billing requires the base HCPCS only. |