ICD-10 Code I82.5Z9 – Chronic embolism and thrombosis of unspecified deep veins of unspecified distal lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.5Z9 – Chronic embolism and thrombosis of unspecified deep veins of unspecified distal lower extremity
What it is
This code identifies a chronic blood clot or embolic obstruction in a deep vein of the lower leg, with the exact vein and laterality not specified. It indicates an ongoing, not acute, venous clotting problem.
Clinical signs
Findings may include persistent leg swelling, pain, heaviness, or skin changes after prior venous thrombosis. Clinical features vary; refer to documentation for evidence of chronicity and the affected distal deep veins.
When to use this code
Use this code when the provider documents chronic embolism or thrombosis in an unspecified deep vein of the distal lower extremity and does not identify the exact vein or side. It is appropriate for follow-up encounters, residual clot, or chronic venous obstruction. Check documentation if the record only states a history of DVT.
Do not use for
Do not use it for acute deep vein thrombosis, superficial thrombophlebitis, or thrombosis in a specified vein when a more exact code is documented. Do not assign it if the provider only notes suspected clot without confirmation.
Coding tip
Look for documentation of chronicity and the distal lower-extremity deep vein location before assigning I82.5Z9.