ICD-10 Code I82.421 – Acute embolism and thrombosis of right iliac vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.421 – Acute embolism and thrombosis of right iliac vein
What it is
I82.421 identifies an acute blood clot or embolus in the right iliac vein. Use it when documentation specifies the right side and the event is acute.
Clinical signs
Typical findings include new unilateral leg swelling, pain, tenderness, or venous congestion. Clinical features vary; refer to documentation and imaging or other diagnostic confirmation when available.
When to use this code
Use this code when the record clearly states acute embolism or thrombosis of the right iliac vein. It fits confirmed right-sided iliac venous clotting in the acute phase, including cases described as thrombus or embolus.
If the provider documents extension from another deep vein location, code according to the most specific documented site. Check documentation when laterality, acuity, or vein location is unclear.
Do not use for
Do not use it for chronic or old iliac vein thrombosis, or for left-sided or bilateral iliac vein disease. Do not assign it when the chart only says deep vein thrombosis without a right iliac vein site.
Coding tip
Capture both acuity and laterality from the provider note, because I82.421 is specific to an acute right iliac vein clot.