Summary & Overview
HCPCS Q4358: Xwrap Dual, Per Square Centimeter (Add-On)
HCPCS Level II code Q4358 denotes an add-on billing unit for the application of Xwrap dual, billed per square centimeter in addition to a primary procedure. As a product-specific add-on code, Q4358 matters nationally because it affects line-item billing for wound and soft-tissue interventions, influences reimbursement calculation for procedures that require adjunct materials, and guides documentation for the amount of product used. The code is relevant across facility and ambulatory settings where such adjunct materials are applied.
Key payers considered include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn the clinical and billing context of Q4358, including how the code functions as a per-square-centimeter add-on, typical sites of service, and which payers commonly encounter claims with this code. The publication outlines common modifiers and payer considerations where available, describes what elements affect reporting (product quantity tied to surface area), and summarizes areas where policy updates or coverage guidance can affect reimbursement. Data not available in the input where specific payer policies, taxonomies, ICD-10 pairings, and related codes would normally appear.
Billing Code Overview
HCPCS Level II code Q4358 describes Xwrap dual, per square centimeter (add-on, list separately in addition to primary procedure). This code represents an add-on product billed per square centimeter when used as an adjunct to a primary procedure involving wound, soft-tissue, or surgical site management.
Service Type: Adjunct wound/soft-tissue product application
Typical Site of Service: Hospital inpatient or outpatient surgical settings, ambulatory surgical centers, and wound care clinics
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with a full-thickness or complex lower-extremity wound (for example, a diabetic foot ulcer with exposed tendon or a large traumatic soft-tissue defect) requiring advanced wound coverage. In the outpatient wound care clinic or inpatient surgical setting, the interprofessional team (vascular surgeon or plastic surgeon, wound care nurse, and advanced practice clinician) evaluates the wound, debrides nonviable tissue, optimizes perfusion and infection control, measures the defect, and selects adjunctive biologic or synthetic products. Q4358 (Xwrap dual, per square centimeter) is billed as an add-on supply when the clinician applies the Xwrap dual matrix to the wound bed to provide a biologic scaffold for tissue regeneration. Typical workflow: wound assessment and measurement → sharp debridement or surgical excision → hemostasis and irrigation → application of Xwrap dual to cover the defect sized in square centimeters → fixation (sutures, staples, or adhesive) and secondary dressing. Follow-up visits include dressing changes, assessment of graft incorporation, and documentation of size reduction and healing progress. The procedure is commonly performed in hospital outpatient departments, ambulatory surgery centers, and specialized wound care clinics.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work or complexity of application of the Xwrap dual is substantially greater than typical (extensive debridement, difficult anatomy). |