ICD-10 Code I82.40 – Acute embolism and thrombosis of unspecified deep veins of lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.40 – Acute embolism and thrombosis of unspecified deep veins of lower extremity
What it is
This code identifies an acute blood clot or embolus in a deep vein of the lower extremity when the exact leg vein is not specified. Use it when documentation confirms a deep vein thrombosis but does not name the specific vessel.
Clinical signs
Typical findings include unilateral leg swelling, pain, tenderness, warmth, or redness, though clinical features vary; refer to documentation. Diagnosis is usually supported by imaging or a clear provider statement of acute deep vein thrombosis.
When to use this code
Use I82.40 when the record states acute DVT or acute venous thrombosis in a lower extremity, but the involved deep vein is not identified. It also fits when the provider documents embolism and thrombosis of an unspecified deep vein in the leg. If laterality or vein detail is available, code more specifically.
Do not use for
Do not use this code for chronic or old thrombosis, superficial thrombophlebitis, or pulmonary embolism without a documented leg vein clot. Check documentation if the note does not clearly state an acute deep venous process.
Coding tip
Look for the words “acute,” “deep vein,” and “lower extremity,” then code the most specific vein and laterality available.