Summary & Overview
HCPCS A6556: Thigh-Length Gradient Compression Stocking, 18-30 mmHg
HCPCS Level II code A6556 represents a custom thigh-length gradient compression stocking providing 18–30 mmHg of pressure, supplied as durable medical equipment. Nationally, this code matters because custom compression garments are commonly used to manage venous and lymphatic disorders and can represent a meaningful component of outpatient durable medical equipment spending and patient care plans. Coverage and payment policies for custom compression items vary across major payers and between commercial plans and Medicare, influencing patient access and out-of-pocket costs.
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 trends, typical reimbursement pathways for custom compression stockings, clinical context for use (including common indications and fitting considerations), and benchmarking themes used to compare payments across payers. The publication summarizes available coding interpretation, common billing practices, and service settings where A6556 is supplied. Data not available in the input will be noted where applicable. The content is intended for a national audience of billing managers, clinicians involved in vascular and wound care, DME suppliers, and policy analysts seeking concise information about HCPCS Level II code A6556.
Billing Code Overview
HCPCS Level II code A6556 describes a gradient compression stocking, thigh length, 18-30 mmHg, custom, each. This item is a custom-fitted medical garment designed to provide graduated compression from the foot upward to the thigh to manage venous insufficiency, lymphedema, post-thrombotic syndrome, or related circulatory conditions.
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Service type: Durable medical equipment / custom compression garment
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Typical site of service: Outpatient medical supply, specialty clinic, home health supply fitting, or durable medical equipment provider
Clinical & Coding Specifications
Clinical Context
A patient with chronic venous insufficiency and symptomatic lower-extremity edema is evaluated in a vascular clinic for compression therapy. The patient is a 62-year-old woman with varicose veins, dependent ankle swelling, and prior superficial thrombophlebitis who reports aching and heaviness in the thigh and calf. After clinical assessment, measurement, and discussion of conservative options, a custom thigh-length gradient compression stocking is ordered to provide therapeutic graduated compression of 18–30 mmHg. The workflow includes: a vascular provider or certified fitter documents the medical necessity and prescribes A6556 (gradient compression stocking, thigh length, 18-30 mmHg, custom, each); measurements are taken by a trained fitter (often at the durable medical equipment supplier or in clinic); the custom garment is fabricated; the patient returns for fitting and education on use and skin care; follow-up with the referring provider documents symptomatic improvement and continued need for replacement or additional compression garments. Typical site of service: outpatient vascular clinic, durable medical equipment supplier’s office, or home health setting for patients requiring home measurement and delivery.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side | Use when the custom stocking is for the left leg only. |