ICD-10 Code I82.403 – Acute embolism and thrombosis of unspecified deep veins of lower extremity, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.403 – Acute embolism and thrombosis of unspecified deep veins of lower extremity, bilateral
What it is
This code identifies an acute blood clot or embolus in the deep veins of both lower extremities when the exact vein is not specified. Use it when documentation confirms bilateral deep vein involvement but not a named vessel.
Clinical signs
Typical findings include leg swelling, pain, tenderness, warmth, or redness, often in both legs. Clinical features vary; refer to documentation, and confirm the diagnosis with imaging or other recorded evidence when available.
When to use this code
Use I82.403 when the provider documents acute DVT or venous thrombosis affecting both lower extremities, but does not identify the specific deep veins involved. It is also appropriate when the record clearly states bilateral lower-extremity thrombosis and no more specific code is supported.
Check documentation if laterality, acuity, or vein location is unclear. Do not assign this code for superficial thrombophlebitis or for chronic, historical, or resolved thrombosis.
Do not use for
Do not use this code for chronic or old deep vein thrombosis, superficial vein thrombosis, or embolism in other vascular beds. If the record specifies a more exact vein, choose that code instead.
Coding tip
Verify both acuity and bilateral lower-extremity involvement before assigning I82.403.