Summary & Overview
HCPCS Level II A4420: Closed Ostomy Pouch for Two-Piece Locking Flange
HCPCS Level II code A4420 identifies a closed ostomy pouch (two-piece) designed to be used with a barrier that has a locking flange. This supply code matters nationally because ostomy appliances are essential durable medical supplies for patients with ostomies; consistent coding supports access to needed supplies and accurate claims processing for home and outpatient care.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare and Medicare. Readers will find an overview of clinical context for the device, typical sites of service where the pouch is used, common billing modifiers associated with durable medical supplies, and national reimbursement and coverage benchmarking where available. The publication also summarizes coding nuances for HCPCS Level II supplies and highlights considerations payers commonly apply to ostomy supply claims.
This piece serves clinicians, billing professionals, and policy analysts who need concise reference material on HCPCS Level II code A4420, including what the code represents, who typically pays for these supplies, and what categories of information to expect when reviewing payer coverage and reimbursement guidance. Data not available in the input is noted where relevant.
Billing Code Overview
HCPCS Level II code A4420 describes a closed ostomy pouch designed for use with a barrier that has a locking flange (two-piece system), sold individually. This product is a disposable ostomy appliance component intended to collect effluent from a surgically created stoma.
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Service type: Durable medical supply / ostomy appliance component
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Typical site of service: Home or outpatient supply setting; used by patients with a stoma for routine ostomy management
Clinical & Coding Specifications
Clinical Context
A 68-year-old patient with a permanent end colostomy following low anterior resection for colorectal cancer presents for routine home medical supply resupply. The patient uses a two-piece ostomy system with a separate barrier (skin flange) that locks a disposable closed ostomy pouch to the barrier. A clinician or durable medical equipment (DME) supplier documents the pouch type, quantity, and date of service. The workflow includes verification of the physician’s order or prescription for ostomy supplies, confirmation of diagnosis supporting ostomy needs, selection of the appropriate A4420 item (closed ostomy pouch for use on barrier with locking flange, two-piece), delivery or pickup coordination, and documentation of product model/size, lot number, and any patient-reported issues such as leakage or skin irritation. Typical billing occurs through a DME supplier or outpatient medical supply vendor; common payors include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, and Medicare.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Default Professional and Technical Components | Rarely used on supply claims; not typical for DME supplies but available in modifier list |