Q4390 Ascendion (HCPCS) Reimbursement & Policy

HCPCS Level II code Q4390 designates billing for Ascendion material charged on a per-square-centimeter basis as an add-on to a primary procedure. As an add-on supply code, Q4390 is used when the specified biomaterial or implant is applied in addition to the main surgical service and must be reported separately. Nationally, add-on supply codes like Q4390 matter because they affect procedure-level cost accounting, payment bundling considerations, and clinical documentation requirements for material usage.

Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of how Q4390 is classified and used, typical sites of service where it applies, and what to expect in payer coverage discussions. The publication summarizes benchmarking and payment context, coding and billing considerations for add-on HCPCS supplies, and clinical scenarios where a per-square-centimeter material is commonly applied.

This national-level summary is intended for coding professionals, reimbursement analysts, and clinical leaders seeking a concise reference on the code's purpose, operational implications for hospital and ambulatory surgical settings, and the payer landscape relevant to add-on biomaterial billing.

Billing Code Overview

HCPCS Level II code Q4390 describes Ascendion, per square centimeter (add-on, list separately in addition to primary procedure). This code represents an add-on supply or material billed in addition to a primary procedure and is reported on a per-square-centimeter basis.

Service Type: Supply / Implantable Biomaterial

Typical Site of Service: Outpatient surgical settings, ambulatory surgery centers, and hospital operating rooms where the primary procedure requiring the material is performed.

Clinical Context

A typical patient is an adult with a localized soft tissue deficit or wound requiring placement of a dermal regeneration matrix or advanced skin substitute measured and billed by surface area. The clinical workflow begins with initial wound assessment in an outpatient wound clinic or operating room, debridement of nonviable tissue, measurement of the defect in square centimeters, selection of the appropriate biologic product (Ascendion) as an add-on to the primary wound repair or grafting procedure, and application of the product to the prepared wound bed. The service is commonly performed in an outpatient ambulatory surgical center, hospital outpatient department, or specialized wound care clinic. Documentation includes wound size (cm2), indication for use (e.g., chronic non-healing ulcer, full-thickness wound), the primary procedure CPT code for wound repair or grafting, product lot numbers, quantity used (cm2), and medical necessity rationale.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier (standard reporting)	Use when no special circumstances apply and the service is billed routinely.
`22`	Increased procedural services	Use when the procedure required substantially greater work or complexity than usual; documentation must justify.

Taxonomy Code	Specialty	Notes
207L00000X	Podiatry	Podiatrists frequently manage foot and ankle wounds and apply dermal substitutes.
207P00000X	Orthopedic Surgery	Orthopedic surgeons may manage complex soft-tissue defects requiring adjunctive biologic products.
208000000X	General Surgery	General surgeons perform debridement and reconstruction where skin substitutes are used.
291U00000X	Plastic Surgery	Plastic and reconstructive surgeons commonly use dermal matrices for wound coverage and grafting.
174400000X	Internal Medicine - Wound Care	Specialty wound care clinicians in outpatient clinics apply and manage advanced wound products.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`L97.421`	Non-pressure chronic ulcer of right heel and midfoot with necrosis of bone	Chronic non-healing lower-extremity ulcer that may require dermal matrix placement to facilitate closure.
`L97.422`	Non-pressure chronic ulcer of left heel and midfoot with necrosis of bone	Left-sided chronic ulcer requiring advanced wound therapies and surface-area–based product billing.
`I83.90`	Varicose veins of lower extremity with ulcer, unspecified	Venous stasis ulcers commonly treated with debridement and adjunctive biologic products.
`E11.621`	Type 2 diabetes mellitus with foot ulcer	Diabetic foot ulcers frequently require advanced wound care including dermal substitutes.
`S81.811A`	Laceration without foreign body of right knee, initial encounter	Acute full-thickness wounds or traumatic defects where a dermal matrix may be used during repair.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`11042`	Debridement, muscle and/or fascia (first 20 sq cm or less)	Often performed prior to placement of a dermal regeneration matrix to prepare the wound bed.
`15002`	Tissue grafts, first 20 sq cm or less, dermis and epidermis; complex, from other donor site	May be the primary procedure to which the add-on product is applied as an adjunct for improved integration.
`15271`	Application of skin substitute graft to trunk, arms, legs, with or without sutures, first 100 sq cm	Commonly paired with an add-on per-square-centimeter product to augment coverage of large defects.
`97605`	Negative pressure wound therapy (NPWT) application, first wound	May be used after application of dermal matrix to promote adherence and healing.
`99213`	Office/outpatient visit, established patient, low to moderate complexity	Typical evaluation and management visit where wound assessment, product selection, and documentation occur.

OpenPayer

Summary & Overview

HCPCS Q4390: Ascendion Material, Per Square Centimeter (Add-on)