Summary & Overview
HCPCS Q4124: Oasis Ultra Tri-layer Wound Matrix, Per cm
HCPCS Level II code Q4124 denotes the Oasis ultra tri-layer wound matrix billed per square centimeter as an add-on supply in wound care procedures. This code captures use of a biologic matrix product designed to support healing in complex, chronic, or hard-to-heal wounds and is relevant across outpatient wound centers, hospital outpatient departments, and ambulatory surgical settings. Nationally, correct coding for advanced wound products affects clinical documentation, supply-line reporting, and payer adjudication for high-cost biologic materials.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for use of tri-layer matrices, typical sites of service, and what to expect in payer coverage patterns. The publication summarizes common billing practices for add-on supply codes, highlights where policy guidance or documentation often influences payment, and outlines benchmarks and labeling considerations that impact claim processing.
This summary provides the foundational information clinicians, coding professionals, and revenue managers need to understand how Q4124 is applied, what controls reimbursement decisions, and which operational and clinical elements are most commonly reviewed by payers.
Billing Code Overview
HCPCS Level II code Q4124 describes the Oasis ultra tri-layer wound matrix, billed per square centimeter as an add-on, list separately in addition to primary procedure. This code represents a biologic wound care product used to support tissue repair and closure in complex or non-healing wounds.
Service Type: Wound care product application / biologic matrix supply
Typical Site of Service: Outpatient wound care clinics, hospital outpatient departments, ambulatory surgical centers, and specialty wound centers
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with a chronic, nonhealing lower extremity wound — for example, a diabetic foot ulcer or a full‑thickness venous stasis ulcer — refractory to standard wound care (debridement, offloading/compression, topical dressings) over several weeks. The wound care specialist evaluates wound size, depth, infection status, vascular supply, and comorbidities. After appropriate debridement and control of infection and ischemia, the clinician selects a biologic wound matrix such as Q4124 (Oasis ultra tri-layer wound matrix, billed per square centimeter as an add‑on) to provide a scaffold for granulation and epithelialization.
Workflow: the patient presents to an outpatient wound clinic or hospital outpatient department; wound bed preparation and debridement are performed; measurements of surface area in square centimeters are documented; and Q4124 is applied to the prepared wound and secured. Post‑application wound care and dressing changes are scheduled, with documentation of size measurements and clinical response to justify per‑cm billing. Typical sites of service include outpatient wound care clinics, hospital outpatient departments, and occasionally inpatient settings when wound management is part of an inpatient stay. Common concomitant services include wound debridement, application of primary dressings, and evaluation/management visits.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|