Summary & Overview
HCPCS Q4193: Coll-e-derm, per square centimeter (add-on)
HCPCS Level II code Q4193 identifies Coll-e-derm billed per square centimeter as an add-on material for dermatologic procedures. The code is used to report supplemental dermal products applied or implanted in conjunction with a primary procedure, with pricing based on area treated. Nationally, accurate use of Q4193 ensures consistent reporting of material costs and supports appropriate claims adjudication for skin substitute or dermal application services.
Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of where this code is applicable, the typical sites of service, and common billing contexts. The publication outlines billing considerations, common modifiers and claim presentation (where available), and notes on documentation expectations tied to per-square-centimeter supply reporting.
This summary provides clinicians, coders, and billing professionals a clear reference for recognizing when Q4193 is reported as an add-on supply for dermatologic procedures and what to expect across major national payers. Data not available in the input includes payer-specific coverage policies, fees, and associated ICD-10 diagnoses.
Billing Code Overview
HCPCS Level II code Q4193 describes Coll-e-derm, billed per square centimeter as an add-on service that must be listed separately in addition to a primary procedure. The code indicates supply or material use for a dermatologic product applied to or implanted in skin, priced on a per-square-centimeter basis.
Service type: Dermatologic product/application
Typical site of service: Outpatient dermatology clinic, physician office, ambulatory surgery center, or other outpatient procedural settings where dermatologic procedures and wound/skin grafting or application of specialized dermal products are performed.
Clinical & Coding Specifications
Clinical Context
A 62-year-old male with a chronic nonhealing full-thickness skin defect following excision of a cutaneous malignancy presents to an outpatient surgical clinic. After surgical debridement and preparation of the wound bed, the surgeon elects to apply a biologic dermal repair matrix product billed as Q4193 (Coll-e-derm, per square centimeter) as an add-on to the primary reconstructive procedure. The clinical workflow includes preoperative assessment, measurement of the wound to determine square centimeters of product required, documentation of medical necessity (wound chronicity, failed conservative measures, or high-risk beds such as exposed tendon), intraoperative application of the Coll-e-derm to the prepared wound, fixation and coverage (with primary closure, skin graft, or secondary dressings as indicated), and postoperative wound care visits to monitor incorporation and healing. Typical sites of service include outpatient ambulatory surgical centers and hospital outpatient departments. Common patient factors include prior radiation, diabetes mellitus, peripheral vascular disease, or extensive soft-tissue loss that necessitate an extracellular matrix scaffold to support tissue regeneration.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier (standard reporting) | Use when no special modifier applies; report Q4193 as an add-on with the primary procedure. |