Summary & Overview
HCPCS Q4378: Renew FT Matrix, Per Square Centimeter
HCPCS Level II code Q4378 denotes the renewal of a functional tissue (ft) matrix charged per square centimeter and is billed as an add-on service in addition to a primary procedure. This code matters nationally because it standardizes reporting and reimbursement for a discrete component of wound and tissue regeneration care, affecting billing consistency across outpatient procedural settings where biomaterial matrices are used.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find: benchmarks for utilization and payment for add-on matrix renewals, clinical context for when a per-square-centimeter renewal is billed, and the typical sites of service where Q4378 is used. The summary outlines payer coverage patterns, common billing modifiers, and coding considerations relevant to facilities and professional practices.
The content provides practical billing context, national payer scope, and concise clinical framing to support coding teams and revenue cycle stakeholders in applying Q4378 consistently and in alignment with payer expectations.
Billing Code Overview
HCPCS Level II code Q4378 describes renew ft matrix, per square centimeter and is reported as an add-on, list separately in addition to primary procedure. The code represents billing for application or renewal of a wound or tissue regeneration matrix product measured and charged by surface area.
Service Type: Wound care / biomaterial matrix renewal procedure
Typical Site of Service: Hospital outpatient departments, ambulatory surgical centers, wound care clinics, and other procedural outpatient settings
Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes.
Clinical & Coding Specifications
Clinical Context
A patient with a chronic non-healing cutaneous wound or soft-tissue defect returns to a wound care clinic or outpatient surgical center for replacement of a preexisting skin substitute or biologic matrix. The service Q4378 describes renewal of a fat (ft) matrix per square centimeter as an add-on to a primary procedure (for example, debridement, wound closure, or application of a primary skin substitute). Typical workflow: the patient is assessed, wound measurements recorded, the wound bed is prepared (sharp debridement, cleansing, hemostasis) and a clinician documents the order for renewal of the fat matrix. The clinician applies the replacement matrix material over the prepared wound, secures it per product instructions, and documents square centimeters treated. The add-on Q4378 is reported in addition to the primary procedure code that describes the definitive wound care or application event. Typical sites of service include outpatient wound care centers, hospital outpatient departments, ambulatory surgical centers, and physician offices. Common patient scenarios include repeated matrix renewal for chronic ulcers (venous stasis ulcer, diabetic foot ulcer), complex soft-tissue defects after excision, or graft maintenance after partial take of a prior biologic dressing.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 |