I82.521

Billable

Chronic embolism and thrombosis of right iliac vein

HCC Category Mapping

V28HCC 267 — Vascular Disease

0.356

V24HCC 108 — Vascular Disease

0.297

ESRDHCC 108 — Vascular Disease

0.000

RxHCCHCC 215 — Pulmonary Embolism and Other Vascular Disease

0.000

What This Code Means

A long-standing blood clot in the iliac vein of the right leg.

Coding Tips

•The iliac vein is a major deep vein proximal to the femoral vein; ensure documentation specifically identifies this vessel
•This code is more specific than unspecified deep vein codes and should be used when the iliac vein is documented

Clinical Significance

Chronic iliac vein thrombosis represents a significant proximal deep vein thrombosis involving one of the largest veins draining the lower extremity into the inferior vena cava. Iliac vein involvement carries a higher risk of post-thrombotic syndrome, chronic venous insufficiency, and recurrent thromboembolism compared to more distal locations. This diagnosis captures substantial vascular disease burden and typically requires long-term anticoagulation and possible interventional management.

Documentation Requirements

✓Provider documentation explicitly stating 'chronic' deep vein thrombosis (not assumed from duration of treatment)
✓Clinical evidence supporting the diagnosis such as duplex ultrasound, venography, or other imaging results
✓Specific vein location documented (e.g., iliac)
✓Documentation confirming right-sided laterality
✓Current treatment plan including anticoagulation therapy and duration
✓Assessment and monitoring notes demonstrating the condition is being actively managed
✓Documentation of chronicity such as 'chronic,' 'old,' 'long-standing,' or history of prior acute deep vein thrombosis that has transitioned to chronic status

Commonly Confused Codes

I82.421 — Acute embolism and thrombosis of iliac vein; ensure chronicity is clearly documented I82.51- — Chronic embolism and thrombosis of femoral vein; the femoral vein is more distal than the iliac; verify exact vein I82.50- — Chronic embolism and thrombosis of unspecified deep veins; use the iliac-specific code when documentation names the iliac vein I82.89- — Chronic embolism and thrombosis of other specified veins; do not use for iliac vein when a specific code exists

Code Hierarchy

└I82Other venous embolism and thrombosis └I82.5Chronic embolism and thrombosis of deep veins of lower extremity └I82.52Chronic embolism and thrombosis of iliac vein └I82.521Chronic embolism and thrombosis of right iliac vein

└I82.521Chronic embolism and thrombosis of right iliac vein