A4575 Topical Hyperbaric Oxygen | HCPCS Reimbursement

HCPCS Level II code A4575 identifies a disposable topical hyperbaric oxygen chamber used to deliver localized, pressurized oxygen to a treatment site. Nationally, this code matters as topical hyperbaric oxygen therapy is an adjunctive modality for wound management and tissue repair, and standardized supply coding supports consistent billing and claims processing for single-use devices.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of where this code fits in clinical practice, typical sites of service, and the payer landscape that affects coverage and reimbursement. The publication highlights benchmarking context, common payer policy considerations, and clinical indications relevant to topical hyperbaric oxygen devices.

This summary provides a concise reference for revenue cycle staff, clinicians involved in wound care, and policy analysts seeking clarity on coding for disposable topical hyperbaric chambers. Data not available in the input for specific payer coverage rules, utilization metrics, and associated diagnosis coding is noted where applicable.

Billing Code Overview

HCPCS Level II code A4575 describes a topical hyperbaric oxygen chamber, disposable. This item is a single-use device intended to deliver concentrated oxygen to a localized treatment area under elevated pressure for therapeutic purposes. The service type is topical hyperbaric oxygen therapy device rental or supply (disposable). The typical site of service is outpatient clinics, wound care centers, and other ambulatory settings where topical wound therapies are provided.

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Clinical Context

A typical patient is a 65-year-old with a chronic nonhealing lower extremity wound (for example, a diabetic foot ulcer) referred to a wound care clinic. After standard wound-bed preparation, debridement, infection control, and appropriate offloading, the clinician selects an adjunctive topical hyperbaric oxygen therapy to enhance local oxygenation and wound healing. The disposable topical hyperbaric oxygen chamber A4575 is placed over the affected limb or wound site in an outpatient wound care center, clinic procedure room, or home health setting under clinician supervision. Treatment sessions typically last 60–90 minutes and are repeated according to the wound care plan (for example, daily or several times weekly) until documented wound improvement. Documentation includes indication, wound measurements, pre- and post-treatment assessments, device serial/lot numbers, duration of each session, any patient tolerance issues, and concurrent wound care procedures such as dressing changes or debridement. Billing captures the supply/device using A4575; any separate professional services (wound care clinician time, debridement) are coded and documented independently with appropriate modifiers when needed.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier	When no modifier applies and standard reporting is appropriate

Taxonomy Code	Specialty	Notes
`174500000X`	Wound care specialist (Physician)	Wound assessment and ordering of adjunctive topical oxygen therapy
`207L00000X`	Podiatry	Management of lower-extremity wounds and application of topical chambers for foot ulcers
`261Q00000X`	Physical Medicine & Rehabilitation	Oversees therapies to promote tissue healing and functional recovery
`363LP0800X`	Nurse Practitioner	Performs treatment delivery and documentation in clinic or home health settings

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`E11.621`	Type 2 diabetes mellitus with foot ulcer	Diabetic foot ulcers are a common indication for adjunctive topical hyperbaric oxygen to promote healing
`L97.411`	Non-pressure chronic ulcer of right lower leg limited to breakdown of skin	Chronic lower-extremity ulcers often receive topical oxygen therapy when standard care has not achieved expected healing
`I83.019`	Varicose veins of right lower extremity with ulcer, unspecified site	Venous stasis ulcers may benefit from adjunctive oxygenation to support tissue repair
`L89.153`	Pressure ulcer of sacral region, stage 3	Pressure injuries with full-thickness skin loss can be managed with adjunctive topical oxygen in selected cases
`M86.171`	Other acute osteomyelitis, right femur	Adjunctive oxygen therapy may be applied as part of multidisciplinary care for complicated soft tissue wounds associated with bone infection

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`11042`	Debridement, subcutaneous tissue, first 20 cm or less	Sharp debridement frequently performed before topical hyperbaric oxygen application to optimize wound bed conditions
`97605`	Negative pressure wound therapy (NPWT) for wound care management, topical application (e.g., wound vacuum), simple; initial or subsequent treatment	Sometimes performed in conjunction with or prior to topical oxygen therapy as part of comprehensive wound care plan
`97597`	Debridement (eg, high-pressure waterjet) open wound, first 20 sq cm or less	Alternative debridement technique billed when used immediately prior to topical oxygen therapy
`99406`	Smoking and tobacco use cessation counseling, intermediate, greater than 3 minutes up to 10 minutes	Behavioral counseling often provided to patients with wounds where smoking cessation is relevant to healing
`99070`	Supplies and materials (except spectacles), provided by physician over and above those usually included with the office visit or procedure	Used to report additional non-covered supplies when applicable alongside billing for `A4575`

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Summary & Overview

HCPCS A4575: Topical Hyperbaric Oxygen Chamber, Disposable