ICD-10 Code I82.523 – Chronic embolism and thrombosis of iliac vein, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.523 – Chronic embolism and thrombosis of iliac vein, bilateral
What it is
This code identifies a long-standing blood clot or embolic blockage in both iliac veins, the large veins in the pelvis that drain blood from the legs. Use it when the condition is chronic and documented as bilateral.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings may include leg swelling, pain, heaviness, or venous insufficiency related to chronic iliac vein obstruction.
When to use this code
Use I82.523 when the provider documents chronic thrombosis or embolism involving both iliac veins. It is appropriate for established, ongoing disease, not an acute clot. Code it from clear imaging, history, or assessment supporting bilateral chronic involvement.
Do not use for
Do not use this code for acute iliac vein thrombosis, unilateral disease, or unspecified venous thrombosis. Check documentation if the record does not clearly state chronicity or bilateral involvement.
Coding tip
Verify both the chronic nature and bilateral iliac vein location before assigning I82.523.