ICD-10 Code I82.539 – Chronic embolism and thrombosis of unspecified popliteal vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.539 – Chronic embolism and thrombosis of unspecified popliteal vein
What it is
This code identifies a chronic blood clot or embolic obstruction in the popliteal vein behind the knee, when the affected side is not documented. Use it for an established, ongoing venous thrombosis rather than an acute event.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include persistent leg swelling, pain, tenderness, or venous insufficiency signs, with imaging confirming chronic thrombus in the popliteal vein.
When to use this code
Use this code when the provider documents chronic embolism or chronic thrombosis in the popliteal vein and does not specify right or left. It also fits follow-up encounters where the condition remains active or is still being managed. Verify that the record supports chronic disease rather than a resolved history.
Do not use for
Do not use this code for acute popliteal vein thrombosis, superficial thrombophlebitis, or a documented personal history of venous thrombosis only. Check documentation if the laterality is specified or if the clot is in a different vein.
Coding tip
Confirm both chronicity and unspecified laterality in the note before assigning I82.539.