I82.523

Billable

Chronic embolism and thrombosis of iliac vein, bilateral

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

Long-standing blood clots in the iliac veins of both legs.

Coding Tips

•This code indicates bilateral iliac vein involvement; confirm documentation clearly states both legs are affected
•Do not use if only one iliac vein is affected; use I82.521 or I82.522 instead

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 bilateral involvement (both extremities affected)
✓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

I82.423 — 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