Summary & Overview
HCPCS Q4361: Epixpress per Square Centimeter, Add-On Supply
HCPCS Level II code Q4361 designates Epixpress billed per square centimeter as an add-on product reported in addition to a primary procedure. As a unit-based HCPCS supply code, it enables itemized reporting for topical dermal therapies applied during procedural encounters, supporting clinical documentation and payer adjudication. Nationally, clarity around add-on supply codes affects billing consistency, reimbursement transparency, and auditing for outpatient procedural care.
Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the code’s clinical role, typical sites of service, common modifiers and billing considerations provided in the source data, and notes where input data was not available. The publication outlines what to expect in claims reporting for add-on topical products, how the code is positioned relative to primary procedures, and which payer relationships are most commonly referenced in national coverage discussions. Policy updates, benchmark data, and payer-specific contract language are not included here; where payer-specific details are absent, the entry notes that input data is not available.
Billing Code Overview
HCPCS Level II code Q4361 represents Epixpress billed per square centimeter as an add-on supply or product that is reported separately in addition to a primary procedure. The service type is topical/dermal application of a clinically applied skin product, and the typical site of service is outpatient procedural settings or ambulatory clinics where a primary procedure requiring adjunct topical therapy is performed.
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with a chronic, nonhealing wound (for example, a diabetic foot ulcer or venous leg ulcer) that has failed standard wound care. The wound care team evaluates the patient in an outpatient wound clinic or hospital-based clinic. After assessment, debridement and wound bed preparation are performed, followed by application of a topical tissue-derived or cellular product billed per square centimeter, Q4361 (Epixpress). The service is reported as an add-on code in conjunction with primary wound care procedures such as debridement or repair. Documentation includes wound measurements (length × width), percent closure or granulation tissue status, prior treatments tried, medical comorbidities (for example diabetes mellitus, peripheral vascular disease), informed consent, and product lot/size applied. Typical sites of service are outpatient wound clinics, hospital outpatient departments, skilled nursing facilities, and, when required, operating rooms for more complex cases. The clinical workflow: wound assessment → cleansing and debridement → measurement and photography → application of Q4361 per cm2 with product lot documentation → dressing and patient instructions → follow-up visits to assess graft/treatment take and additional applications as needed.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier |