Summary & Overview
HCPCS E0691: Ultraviolet Light Therapy System, Small Treatment Area
HCPCS Level II code E0691 represents an ultraviolet light therapy system that includes bulbs/lamps, a timer, and eye protection for treatment areas of 2 square feet or less. The code designates compact phototherapy equipment used for localized dermatologic treatments and durable medical equipment provision. Nationally, this code matters because it defines coverage and billing for small-area phototherapy devices used in dermatology, affecting reimbursement for clinics, durable medical equipment suppliers, and home-based therapy programs.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of payer coverage considerations and common billing practices associated with small-area ultraviolet phototherapy devices, as well as clinical context for use in dermatologic conditions. The publication outlines typical sites of service, service type classification, and common modifier usage where applicable. Benchmarking data and payer-specific policy updates are summarized when available; where input data is not provided, readers will see "Data not available in the input." The guide is intended to clarify coding scope, support accurate charge capture, and inform compliance checks and claims submissions for providers and billing staff working with localized phototherapy equipment.
Billing Code Overview
HCPCS Level II code E0691 describes an ultraviolet light therapy system that includes bulbs/lamps, a timer, and eye protection. The device is specified for a treatment area of 2 square feet or less, indicating a compact unit designed for localized phototherapy treatments.
Service type: Durable medical equipment — phototherapy system for localized skin treatment
Typical site of service: Outpatient clinics, dermatology offices, ambulatory care centers, or patient homes when issued as durable medical equipment.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with localized inflammatory or photoresponsive dermatologic conditions such as psoriasis, atopic dermatitis, vitiligo, or localized eczema who requires targeted ultraviolet phototherapy to a limited surface area (2 square feet or less). The patient presents to a dermatology clinic or outpatient phototherapy suite after failing or partially responding to topical therapies or when systemic therapy is not indicated. The clinician documents the diagnosis, treatment plan, frequency (often 2–3 times weekly), and measured treatment area. The clinic prepares a portable or stationary ultraviolet light therapy system (E0691) that includes bulbs/lamps, a timer, and eye protection. The medical assistant or technician positions the device over the treatment site, verifies eye protection, programs the timer and dose, and starts the session while the supervising dermatologist or trained provider remains available per facility policy. Treatment parameters, start and stop times, skin response, and any adverse events are documented in the medical record. Billing uses the HCPCS Level II code E0691 for the device-based phototherapy session for the specified small treatment area.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing for the physician's interpretation or supervision of phototherapy separate from facility/device charges. |