HCPCS Q4345: Matrix HD Allograft Dermis, Per Square Centimeter (Add-On)

HCPCS Level II code Q4345 designates a matrix human-derived allograft dermis billed per square centimeter as an add-on supply to a primary surgical procedure. This material is used in soft-tissue repair and reconstructive surgeries to provide biologic scaffolding and support. As an add-on supply code, Q4345 is reported in addition to the primary procedure code when the allograft is implanted.

Key national payers in scope include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise review of the code’s clinical context, typical sites of service, and payer considerations. The publication also outlines common modifiers associated with add-on supply reporting and flags where data is not available in the input.

The analysis provides benchmarks and policy-relevant notes useful for billing, coding, and revenue cycle teams: how the code is positioned relative to primary procedures, common settings where the material is used, and the payer mix most relevant for national coverage and reimbursement patterns. Data elements that were not provided in the input—such as associated taxonomies, specific ICD-10 diagnoses, related codes, and detailed payer policy language—are noted as not available in the input.

Billing Code Overview

HCPCS Level II code Q4345 refers to matrix hd allograft dermis, billed per square centimeter as an add-on. The code indicates a biologic dermal allograft product used to supplement soft-tissue repair and reconstruction procedures and is reported in addition to a primary surgical procedure when the allograft material is implanted.

Service type: Allograft dermal matrix implantation (add-on supply)

Typical site of service: Hospital operating room or ambulatory surgical center, where surgical reconstruction or repair requiring dermal matrix support is performed.

Clinical Context

A 64-year-old patient with a full-thickness lower leg wound after debridement of a chronic venous ulcer presents for reconstruction. The surgeon selects a biologic dermal allograft to provide a scaffold for dermal regeneration and to improve wound closure over exposed tendon. In the ambulatory surgery center or hospital operating room, after adequate debridement and hemostasis, the allograft is measured and trimmed; the graft is applied to the wound bed and secured with sutures or staples. The service is billed per square centimeter using the add-on HCPCS Level II code Q4345 in addition to the primary procedure code (for example, excision/debridement or skin grafting). Typical sites of service include the hospital outpatient department, ambulatory surgery center, or inpatient operating room when wound complexity or patient comorbidity requires higher acuity care. Common clinical workflow steps: preoperative evaluation and wound assessment, operative debridement (CPT skin/wound procedure), measurement and application of the allograft with documentation of number of square centimeters used, appropriate intraoperative and postoperative modifiers applied to reflect unusual circumstances, and postoperative wound care with follow-up visits documented for graft incorporation and healing.

Coding Specifications

Modifier	Description	When to Use
`00`	Default / no modifier	Use when no special circumstances or informational modifiers apply

Taxonomy Code	Specialty	Notes
`2080S0004X`	Plastic Surgery	Plastic surgeons commonly perform wound reconstruction and allograft placement
`207P00000X`	General Surgery	General surgeons manage complex lower extremity and soft tissue wounds requiring grafts
`363L00000X`	Wound Care Medicine	Wound care specialists evaluate chronic wounds and coordinate graft-based therapies
`207K00000X`	Orthopedic Surgery	Orthopedic surgeons may be involved when tendon or bone exposure necessitates soft tissue coverage
`2084P0800X`	Dermatology	Dermatologic surgeons perform debridement and grafting for cutaneous defects

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`L97.421`	Non-pressure chronic ulcer of right calf with necrosis of muscle	Chronic limb ulcer with exposed structures often requires debridement and dermal allograft to achieve closure
`L97.522`	Non-pressure chronic ulcer of left foot with necrosis of bone	Deep ulcers with bone involvement may need staged debridement and dermal scaffold placement
`I83.10`	Varicose veins of unspecified lower extremity with ulcer	Venous stasis ulcers are a common indication for biologic grafts after wound bed optimization
`M86.171`	Subacute osteomyelitis, right femur	Complex wounds with osteomyelitis may necessitate soft tissue coverage using allografts in reconstructive stages
`T79.A11`	Traumatic amputation of right lower leg with open wound	Traumatic soft tissue loss may be reconstructed using dermal allografts as part of limb salvage

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`11043`	Debridement; skin, subcutaneous tissue, and muscle (includes removal of devitalized tissue)	Often performed before allograft placement to prepare a viable wound bed
`15002`	Adjacent tissue transfer or rearrangement, trunk, arms or legs; second and subsequent increments (includes skin grafting procedures)	May be performed in conjunction with dermal allograft placement for larger defects requiring tissue rearrangement
`15271`	Split-thickness autograft, trunk, arms, legs; first 100 sq cm or less, or one percent of body surface of infants and children	Autografting may be performed after or with dermal allograft application depending on technique (e.g., allograft as dermal substitute with overlying autograft)
`97602`	Debridement (e.g., high pressure waterjet, sharp) without anesthesia, non-selective	Outpatient debridement codes may be used in wound care clinics prior to operative allograft placement
`11044`	Debridement; includes skin, subcutaneous tissue, muscle, and bone	Used when deeper debridement including bone is required prior to allograft application

OpenPayer

Summary & Overview