Summary & Overview
HCPCS Q4436: Renati ac membrane, per square centimeter (add-on)
HCPCS Level II code Q4436 identifies the Renati ac membrane billed per square centimeter as an add-on supply used in surgical procedures to support tissue repair and regeneration. As an HCPCS Level II supply code, Q4436 is used to capture product-specific costs separate from primary surgical procedure codes and is relevant across hospital outpatient, inpatient operating room, and ambulatory surgical center settings. Nationally, proper use of Q4436 matters for accurate claims reporting, supply cost accounting, and tracking utilization of biologic membranes.
Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical role, typical sites of service, and how it functions as an add-on supply code. The publication provides benchmarks for utilization and reimbursement where available, notes recent policy or coding guidance that affects add-on supply billing, and outlines clinical contexts in which a membrane product like Renati ac is commonly applied. This resource is designed for billing professionals, revenue cycle managers, and clinicians seeking a clear reference on HCPCS Level II code Q4436 and its place in procedure billing and supply coding.
Billing Code Overview
HCPCS Level II code Q4436 describes a Renati ac membrane, billed per square centimeter as an add-on, list separately in addition to primary procedure. This represents a biologic membrane product applied during surgical procedures to support tissue repair or regeneration.
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Service type: Surgical implant / biologic membrane application
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Typical site of service: Hospital operating room or ambulatory surgical center
Clinical & Coding Specifications
Clinical Context
A typical patient is a middle-aged adult presenting to an outpatient ophthalmology or oculoplastic surgery practice with a full-thickness corneal defect or stromal loss after trauma, infectious keratitis, or failed prior graft, where an amniotic membrane substitute (Renati ac membrane) is required as an adjunct to primary repair. The clinical workflow begins with pre-procedure assessment including visual acuity, slit-lamp exam, and identification of wound size and location. In the operating room or procedure suite, the surgeon performs the primary procedure (for example, corneal patch graft, tectonic keratoplasty, or debridement with conjunctival flap) and then applies the Renati ac membrane sized per square centimeter as an add-on biologic membrane to promote epithelialization, reduce inflammation, and support tissue healing. Post-procedure care includes topical antibiotics and steroids per surgeon protocol, scheduled follow-up visits to assess membrane integration and epithelial closure, and documentation of membrane square centimeters used for billing Q4436 as an add-on to the primary procedure code.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
-59 | Distinct procedural service | When the Renati membrane application is distinct and separate from another procedure performed at the same session and needs to be identified as separate from the primary procedure. |