ICD-10 Code I82.50 – Chronic embolism and thrombosis of unspecified deep veins of lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.50 – Chronic embolism and thrombosis of unspecified deep veins of lower extremity
What it is
This code identifies a long-standing clot or embolic obstruction in a deep vein of the lower extremity when the affected leg vein is not further specified. It applies to chronic disease, not an acute new clot.
Clinical signs
Patients may have leg swelling, pain, heaviness, skin discoloration, or signs of chronic venous insufficiency. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents chronic embolism or thrombosis in a deep vein of the lower extremity and does not identify a more specific vein. It is appropriate for follow-up visits, ongoing management, or residual disease after prior thrombosis. Check documentation if laterality or vein location is stated elsewhere.
Do not use for
Do not use it for acute deep vein thrombosis, superficial vein thrombosis, or embolism in a non-leg vessel. If the record specifies a more precise site or acute event, code that instead.
Coding tip
Look for “chronic,” “old,” or “residual” thrombus wording and confirm the lower-extremity deep vein is unspecified.