Summary & Overview
HCPCS A6530: Below-Knee Gradient Compression Stocking, 18-30 mmHg
HCPCS Level II code A6530 represents a single below-knee gradient compression stocking providing 18–30 mmHg of pressure. Compression stockings are commonly used for venous insufficiency, edema management, post-thrombotic care, and prevention of venous thromboembolism in ambulatory patients; accurate coding affects coverage, supplier billing, and patient out-of-pocket costs. Nationally, durable medical equipment and supply codes like A6530 influence utilization patterns and payer policy development for conservative venous therapies.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code's clinical context, typical sites of service, and the payer landscape covered in the analysis. The publication also summarizes benchmarks where available, notes recent policy directions affecting compression garment coverage, and outlines considerations for supply providers and billing staff when documenting and billing for below-knee gradient compression stockings.
This summary is intended for national audiences including clinicians, billing professionals, durable medical equipment suppliers, and policy analysts seeking a clear reference on the definition, use cases, and payer relevance of A6530.
Billing Code Overview
HCPCS Level II code A6530 describes a gradient compression stocking, below knee, 18-30 mmHg, each. This item is a single below-knee compression stocking designed to provide graduated compression in the 18–30 millimeters of mercury range.
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Service type: Durable medical supply — compression garment
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Typical site of service: Outpatient or ambulatory settings, home health supply, or retail medical equipment dispensing where compression stockings are issued to the patient
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Clinical & Coding Specifications
Clinical Context
A 68-year-old ambulatory patient with chronic venous insufficiency and symptomatic lower-extremity edema is evaluated in an outpatient vascular clinic. The clinician documents complaints of aching, heaviness, and mild ankle swelling worse at the end of the day. Physical exam demonstrates pitting edema to the mid-calf and varicose changes. The clinician prescribes a single pair of gradient compression stockings, below-knee, providing 18–30 mmHg compression to reduce venous stasis and improve symptomatic edema control.
The clinical workflow includes: referral or prescription generated by the vascular specialist or primary care provider; measurement of the patient’s calf circumference and length for proper fit; selection of an appropriate size and style; purchase or provision of the stocking (each stocking billed as one unit). Education on application, wear schedule, skin care, and follow-up assessment is provided. Typical site of service is outpatient clinic, durable medical equipment supplier, or retail medical supply location.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side | When the stocking is supplied for the left leg only |
RT |