Summary & Overview
HCPCS Q4134: Hmatrix per Square Centimeter, Add-On Supply
HCPCS Level II code Q4134 designates Hmatrix billed per square centimeter as an add-on supply that must be reported separately from the primary procedure. This code captures the incremental cost of a biologic matrix or graft material priced by surface area, commonly used in surgical and wound-reconstruction contexts. Nationally, accurate reporting of add-on supply codes like Q4134 affects claim adjudication and captures resource use tied to advanced biologic products.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides a concise review of billing characteristics, typical sites of service, and what payers commonly expect for add-on supply reporting. Readers will find benchmarks for coding and billing practice, discussion of payer coverage considerations, and clinical context regarding when per-square-centimeter supplies are used. The piece also outlines common modifiers associated with this code when reported alongside a primary procedure and notes areas where input data was not provided.
This national overview is intended for billing managers, revenue cycle professionals, and clinical staff involved in procedural supply documentation, offering clear context on when Q4134 applies and what information payers typically evaluate during claim processing.
Billing Code Overview
HCPCS Level II code Q4134 describes Hmatrix billed per square centimeter as an add-on supply or product that must be listed separately in addition to a primary procedure. This itemized supply is typically used when a biologic matrix or similar graft material is applied and priced by surface area.
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Service type: Supply/product (biologic matrix) billed per unit area
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Typical site of service: Surgical settings where grafting or matrix application occurs, such as operating rooms, ambulatory surgery centers, or procedure suites
Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related procedure codes.
Clinical & Coding Specifications
Clinical Context
A 62-year-old male with a chronic full-thickness lower extremity wound following peripheral arterial disease undergoes surgical debridement and placement of a biologic dermal matrix to assist wound closure. The product billed is Q4134 (Hmatrix, per square centimeter), which is reported as an add-on item in combination with a primary wound procedure. Typical workflow: the patient is evaluated in an outpatient wound clinic or ambulatory surgery center; the wound is surgically debrided and hemostasis achieved; the surgical field is prepared and the Hmatrix graft is cut to size and secured to the wound bed to provide a collagen scaffold for tissue regeneration; dressings are applied and post-procedure wound care instructions provided. Typical sites of service include outpatient surgical centers, hospital outpatient departments, and specialized wound care clinics. Patient scenarios include diabetic foot ulcers, venous stasis ulcers, pressure ulcers, traumatic soft tissue defects, and surgical wound coverage where a biologic matrix is indicated as an adjunct to primary repair.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier | Standard reporting when no modifier applies |
22 |