Summary & Overview
HCPCS A6535: Gradient Compression Stocking, Thigh Length, ≥40 mmHg
HCPCS Level II code A6535 denotes a high-compression, thigh-length gradient stocking (40 mmHg or greater) supplied per limb. These garments are used therapeutically to manage severe venous insufficiency, lymphedema, post-thrombotic syndrome, and other conditions requiring strong graduated compression. Nationally, accurate coding of high-compression hosiery affects coverage determinations, equipment supplier billing, and patient access to prescribed compression therapy.
Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical purpose and service setting, payer coverage scope, common billing modifiers, and related policy or coding considerations where available. The publication summarizes benchmark reimbursement patterns, documentation and medical necessity factors typically relevant for high-compression, thigh-length stockings, and points to areas where policy updates or payer-specific coverage rules commonly influence claim outcomes.
This summary is written for a national audience and focuses on code definition, clinical context, and the types of billing and coverage issues stakeholders should expect when dealing with high-grade thigh-length compression stockings.
Billing Code Overview
HCPCS Level II code A6535 describes a gradient compression stocking, thigh length, 40 mmHg or greater, each. This item is a therapeutic compression garment designed to provide high-grade compression to the thigh and lower extremity for conditions requiring strong graduated pressure.
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Service type: Durable medical equipment (compression garment)
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Typical site of service: Outpatient supply settings, durable medical equipment suppliers, home use
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Clinical & Coding Specifications
Clinical Context
A patient with symptomatic chronic venous insufficiency or post-thrombotic syndrome presents to an outpatient vascular clinic for management of leg edema and venous stasis. The clinician assesses the patient and documents the indication for compression therapy, including symptoms (leg heaviness, aching, edema), physical findings (pitting edema, varicosities, hyperpigmentation), and prior conservative measures. A thigh-length, gradient compression stocking that provides 40 mmHg or greater pressure (billing code A6535, each) is selected for patients who require high-compression therapy for severe chronic venous disease, lymphedema of the lower extremity, or after deep vein thrombosis. The workflow includes measurement of limb circumference and length by a certified fitter or clinician to ensure appropriate sizing, patient education on application and wear schedule, documentation of medical necessity in the chart, and issuing a prescription/order specifying thigh-length, gradient compression, and 40 mmHg or greater. Follow-up visits evaluate fit, symptom improvement, skin integrity, and need for replacement. Durable medical equipment vendors or medical supply departments typically furnish the stocking, and the supply is billed using A6535 per stocking (each).
Coding Specifications
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