HCPCS Level II Q4391: Amnioplast double, per square centimeter

HCPCS Level II code Q4391 denotes a double-layer amnioplastic graft billed per square centimeter as an add-on to a primary surgical procedure. This code matters nationally because it standardizes reporting for the application of amniotic membrane products in surgical and wound-care settings, enabling clearer tracking of utilization and facilitating consistent claims processing for adjunct biologic graft materials. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn what the code represents clinically and operationally, the typical sites of service where it is used (operating room, ambulatory surgical center, procedure suite), and what to expect in terms of payor coverage considerations. The publication provides benchmarks and coding context for billed surface area units, describes common modifiers and their billing roles, and summarizes national policy themes affecting add-on biologic graft codes. Data not available in the input is noted where applicable.

Billing Code Overview

HCPCS Level II code Q4391 describes Amnioplast double, billed per square centimeter as an add-on, list separately in addition to primary procedure. This code represents the application of a double-layer amniotic membrane graft product measured and billed by surface area.

Service type: Surgical grafting/tissue augmentation using an amniotic membrane product
Typical site of service: Operating room or procedure suite in a hospital or ambulatory surgical center

Clinical Context

A typical patient is an adult or adolescent presenting with a full-thickness or complex amniotic membrane defect after conjunctival disease, ocular surface reconstruction, pterygium surgery complication, chemical burn, or persistent corneal epithelial defect. The procedure coded as Q4391 (amnioplast double, per square centimeter) is used when two layers of amniotic membrane are applied to the ocular surface to promote healing, provide a biologic scaffold, reduce inflammation, and restore corneal or conjunctival integrity. Clinical workflow includes preoperative assessment by an ophthalmologist (cornea or oculoplastic specialist), informed consent, sterile preparation in an operating room or procedure suite, measurement of the defect size, tailoring and securing two layers of amniotic membrane (often with fibrin glue, sutures, or a combination), postoperative topical antibiotics and corticosteroids, and scheduled follow-up visits to monitor integration and epithelialization. Typical sites of service are hospital outpatient surgical departments, ambulatory surgery centers, and certain ophthalmology procedure suites equipped for minor ocular surgery. Patient factors such as active infection, ocular surface inflammation, and prior grafting procedures influence intraoperative decisions and potential use of modifiers to reflect complexity or supplies used.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier — standard reporting

Taxonomy Code	Specialty	Notes
`207W00000X`	Ophthalmology	Cornea specialists commonly perform complex amniotic membrane grafting.
`207WC0002X`	Oculoplastic Surgery	Oculoplastic surgeons perform ocular surface reconstruction and conjunctival repairs using amniotic membrane.
`363LP0200X`	Eye Bank Technician	Eye bank personnel supply and prepare amniotic membrane grafts and ancillary graft material.
`207VN0200X`	Surgical Ophthalmology	Surgeons focused on anterior segment procedures who manage corneal defects and grafting.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`H16.221`	Peripheral corneal ulcer, right eye	Corneal ulcers that compromise the epithelium may require amniotic membrane double-layer grafting to promote healing and prevent perforation.
`H16.222`	Peripheral corneal ulcer, left eye	Same clinical relevance for the left eye.
`T26.XXA`	Burn of the eye and adnexa, initial encounter	Chemical or thermal burns causing extensive epithelial loss often require amnioplast for ocular surface reconstruction.
`H11.29`	Other conjunctival scarring	Severe conjunctival scarring with symptomatic defects may be treated with amniotic membrane to restore fornix and surface integrity.
`H11.31`	Conjunctival cyst	When excision creates a conjunctival defect, amnioplasty may be used for reconstruction.
`H18.89`	Other corneal disorders	Diverse corneal pathologies, including persistent epithelial defects and stromal thinning, where amniotic membrane supports healing.
`H11.00`	Conjunctivitis, unspecified	In select complicated or chronic cases with resulting surface breakdown, amnioplasty may be considered as part of reconstruction.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`66140`	Excision of pterygium; simple	Performed before or instead of amniotic membrane grafting when pterygium is the underlying cause of the defect; amnioplast may follow to prevent recurrence or repair conjunctival defect.
`65435`	Conjunctival advancement (fornix reconstruction), with or without graft	May be performed in the same operative session for extensive conjunctival defects together with amniotic membrane placement.
`65778`	Placement of amniotic membrane on the ocular surface for wound healing (separate procedure code for some payers)	Often performed as the primary CPT-equivalent procedure; `Q4391` is an HCPCS add-on describing double-layer amnioplast billed per square centimeter in addition to primary procedure.
`15271`	Application of skin substitute graft to face, scalp, eyelids or external genitalia; up to 75 sq cm	In some settings, comparable grafting supply codes or tissue handling codes are reported alongside amniotic membrane grafting for supply valuation and surgical staging.
`99070`	Supplies and materials (except spectacles), used by physician or other qualified health care professional	Used to report additional non-implantable supplies not included in the primary procedure when payers permit separate supply reimbursement.

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Summary & Overview