HCPCS Q4331: Axolotl Graft, Per Square Centimeter (Add-on) - OpenPayer

Summary & Overview

HCPCS Q4331: Axolotl Graft, Per Square Centimeter (Add-on)

HCPCS Level II code Q4331 designates an axolotl graft billed per square centimeter as an add-on supply to a primary procedure. The code captures a biological graft product used in reconstructive or wound repair settings and matters nationally as novel biologic grafts are increasingly incorporated into surgical workflows and wound management protocols. Payers evaluate appropriate coding and coverage for add-on graft supplies given clinical necessity and cost implications. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn the clinical context for use of an axolotl graft, typical billing considerations for an add-on HCPCS supply, payer coverage landscape, and operational benchmarks where available. The summary also highlights common modifiers used with add-on supplies and notes where data is not available. Content covers coding intent, service settings, and what to expect in payer adjudication and documentation requirements for implantable or graft products. Data not available in the input for associated taxonomies, ICD-10 diagnoses, related codes, and detailed payer-specific policy language.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareQ4331HCPCS Level IIaxolotl graftbiologic graftsurgical supplyadd-on codewound carereconstructive surgeryimplantable product

Billing Code Overview

HCPCS Level II code Q4331 describes an Axolotl graft, billed per square centimeter. It is designated as an add-on, list separately in addition to primary procedure, indicating that the supply or implant is reported in addition to a primary surgical or wound-care procedure.

Service type: Biological graft supply for surgical or wound reconstruction procedures
Typical site of service: Operating room or procedural suite; may also be used in specialized wound care clinics depending on clinical context

Clinical & Coding Specifications

Clinical Context

A 62-year-old patient with a chronic, non-healing full-thickness lower-extremity wound following surgical debridement presents to an outpatient wound center for biologic skin replacement. The treating clinician applies an engineered axolotl-derived graft product charged per square centimeter using HCPCS Level II code Q4331 as an add-on supply to the primary wound coverage procedure. Typical workflow: initial evaluation and wound measurement, debridement or preparation of the wound bed (if not previously completed), hemostasis and cleansing, placement and fixation of the axolotl graft to match the measured defect, application of appropriate secondary dressings, patient and caregiver education on wound care and activity restrictions, and scheduled follow-up visits for graft assessment and dressing changes. Typical sites of service include outpatient wound clinics, ambulatory surgery centers, hospital outpatient departments, and specialized dermatologic or plastic surgery offices. The typical patient scenario includes individuals with large traumatic wounds, burns, surgical defects, or chronic ulcers (e.g., diabetic or vascular) requiring biologic graft augmentation to support healing where the graft area is billed by square centimeter as an add-on product.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work required to apply the graft is substantially greater than typical.

HCPCS Level II Q4391: Amnioplast double, per square centimeter

HCPCS-Q9956-OCTAFLUOROPROPANE-MICROSPHERES-INJECTION-CONTRAST-AGENT

HCPCS Q9956: Injection of Octafluoropropane Microspheres, per mL

HCPCS-Q4112-CYMETRA-INJECTABLE-1CC

HCPCS Q4112: Cymetra injectable, 1 cc

HCPCS-Q4278-EPIEFFECT-PER-SQ-CM-TOPICAL-DERMAL-TREATMENT

HCPCS Level II Q4278: Epieffect, Per Square Centimeter

HCPCS-Q4328-AREA-BASED-ADD-ON-PER-SQ-CM

HCPCS Q4328: Area-Based Add-On Service, Per Square Centimeter

HCPCS-Q4043-PEDIATRIC-LONG-LEG-PLASTER-SPLINT

HCPCS Q4043: Cast Supplies, Pediatric Long Leg Plaster Splint

HCPCS-Q4340-SIMPLIGRAFT-PER-SQ-CM-SKIN-SUBSTITUTE-ADD-ON

HCPCS Level II Q4340: Simpligraft per Square Centimeter

HCPCS-Q0081-INFUSION-THERAPY-NON-CHEMOTHERAPEUTIC-PER-VISIT

HCPCS Q0081: Infusion Therapy, Non-Chemotherapeutic, Per Visit

HCPCS-Q4003-SHOULDER-CAST-PLASTER-ADULT-CAST-SUPPLIES

HCPCS Level II Q4003: Adult Shoulder Plaster Cast Supplies

HCPCS-Q4285-NUDYN-DL-MESH-PER-SQ-CM-ADD-ON

HCPCS Q4285: Nudyn dl Mesh, Per Square Centimeter (Add-on)

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Taxonomy Code	Specialty	Notes
`207Q00000X`	Plastic Surgery	Common specialty performing biologic graft placement and reconstruction.
`207N00000X`	Dermatology	Performs skin grafting and biologic graft applications in outpatient settings.
`208600000X`	General Surgery	Manages traumatic or surgical wound reconstruction using biologic grafts.
`363L00000X`	Wound Care (Podiatry/Wound Care Specialists)	Specialists in chronic wound management who place biologic grafts for limb salvage.
`207X00000X`	Otolaryngology (Head & Neck Surgery)	May apply grafts for head and neck mucocutaneous defects.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`L97.421`	Non-pressure chronic ulcer of left heel and midfoot with necrosis of muscle	Chronic lower-extremity ulcers often require biologic grafts to promote closure after debridement.
`L97.329`	Non-pressure chronic ulcer of right lower leg with unspecified severity	Common indication for grafting when conservative measures fail and tissue coverage is needed.
`S81.811A`	Laceration with foreign body of right lower leg, initial encounter	Traumatic wounds with tissue loss may need biologic grafts charged per cm for coverage.
`T31.2`	Burns involving 10-19% of body surface area, partial-thickness	Partial-thickness burns requiring skin substitute or biologic grafting for healing.
`E11.621`	Type 2 diabetes mellitus with foot ulcer	Diabetic foot ulcers frequently require advanced wound therapies including biologic graft application.
`I83.019`	Varicose veins of unspecified lower extremity with ulcer, unspecified site	Venous stasis ulcers can necessitate grafting for large or non-healing defects.
`C44.512`	Squamous cell carcinoma of skin of left lower limb, except hip	Surgical excision defects after oncologic resection may be reconstructed with biologic grafts.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`11042`	Debridement, subcutaneous tissue (e.g., first 20 sq cm or less)	Commonly performed before graft placement to prepare the wound bed and remove necrotic tissue.
`15100`	Split-thickness autograft, trunk, arms, legs; first 100 sq cm or less, or first 25% of body surface	May be performed in conjunction when autograft is harvested in addition to or instead of the axolotl graft; used in combined reconstructive workflows.
`97602`	Debridement, open wound, selective debridement, without anesthesia (e.g., enzymatic, mechanical)	Used in outpatient wound clinics to prepare wounds prior to biologic graft application.
`15271`	Application of skin substitute graft to trunk, arms, legs; 1% or less of body surface or per square centimeter billing adjuncts	Often reported for application of biologic or synthetic skin substitutes; used alongside product add-on codes like `Q4331`.
`97597`	Debridement selective debridement by sharp, including wound assessment, first 20 sq cm or less	Performed prior to graft placement to ensure a viable wound bed.
`12001`	Simple repair of superficial wounds (face, ears, eyelids, nose, lips)	Minor closure or adjunctive closure techniques used when graft placement is combined with primary closure in smaller defects.

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