Summary & Overview
HCPCS Level II Q4351: Enclose TL Matrix, Per Square Centimeter (Add-on)
HCPCS Level II code Q4351 identifies an add-on supply described as an enclose tl matrix, billed per square centimeter. As an add-on HCPCS supply code, Q4351 is used in conjunction with a primary procedure to capture the incremental material cost and area-based usage of a specialized matrix product applied to a wound or procedural site. Nationally, accurate reporting of add-on supply codes like Q4351 matters for clinical documentation, device tracking, and supply cost accounting across diverse care settings.
Key payers commonly referenced in coverage and payment considerations include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code definition and clinical context, typical sites of service, common modifiers and billing considerations, and discussion of payer coverage patterns where available. The publication highlights benchmarks and coding practice implications relevant to revenue cycle operations, clinical documentation teams, and supply chain managers, and notes where input data are not available. This material is intended to inform national coding policy awareness and operational planning for entities that bill for specialized wound and procedural matrix products.
Billing Code Overview
HCPCS Level II code Q4351 describes an enclose TLC matrix, billed per square centimeter as an add-on supply item to be reported in addition to a primary procedure. The service type is medical supply/device application intended to quantify the area of a specialized wound or procedural site covered by the matrix. The typical site of service for reporting this add-on supply is outpatient procedural settings or inpatient facilities where the primary procedure requiring the matrix is performed, such as operating rooms, procedure suites, wound care clinics, or hospital inpatient units.
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A patient undergoing surgical excision of a skin lesion or wound repair requires placement of an enclosed tissue-level (tl) wound matrix product to support dermal regeneration. The encounter typically occurs in an outpatient surgical clinic, ambulatory surgery center, or hospital outpatient department. A representative scenario: a 62-year-old patient with a chronic non-healing full-thickness skin defect following wide local excision of a cutaneous malignancy. The surgeon performs lesion excision, achieves hemostasis, and places an enclosed tissue-level matrix patch trimmed to size; the billing uses add-on code Q4351 reported per square centimeter in addition to the primary debridement or excision procedure. Procedure documentation includes wound dimensions (cm2), product lot number, placement technique, and any intraoperative complications. Post-procedure care instructions and wound care follow-up are documented in the clinic record.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier | Generally not used for Medicare; placeholder in input list |
22 | Increased procedural services |