ICD-10 Code I82.409 – Acute embolism and thrombosis of unspecified deep veins of unspecified lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.409 – Acute embolism and thrombosis of unspecified deep veins of unspecified lower extremity
What it is
This code identifies an acute blood clot or embolus in a deep vein of the lower leg or thigh, when the exact side and vein are not documented. Use it when the record confirms deep vein thrombosis but leaves the location unspecified.
Clinical signs
Common findings include unilateral leg swelling, pain, warmth, tenderness, or redness. Clinical features vary; refer to documentation, and confirm the diagnosis with imaging or provider assessment when recorded.
When to use this code
Use I82.409 when the provider documents acute DVT or acute embolism/thrombosis in a deep vein of the lower extremity, but does not specify right, left, or a named vein. It is appropriate for emergency, inpatient, or outpatient records with incomplete site detail. If laterality or vein is documented elsewhere, code the more specific option instead.
Do not use for
Do not use this code for chronic or old DVT, superficial vein thrombosis, or pulmonary embolism. Check documentation if the clot is in a specified vein or if another lower-extremity DVT code is more accurate.
Coding tip
Query the provider for laterality and vein site before defaulting to an unspecified code.