ICD-10 Code I82.4Y9 – Acute embolism and thrombosis of unspecified deep veins of unspecified proximal lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.4Y9 – Acute embolism and thrombosis of unspecified deep veins of unspecified proximal lower extremity
What it is
This code identifies an acute clot blocking a deep vein in the proximal lower extremity when the exact vein is not documented. It applies to unspecified deep veins in the thigh or upper leg region.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include unilateral leg swelling, pain, warmth, or tenderness, with imaging confirming deep vein thrombosis.
When to use this code
Use this code when the record states acute embolism or thrombosis of a deep vein in the proximal lower extremity but does not specify the exact vein. It is appropriate when the site is documented as unspecified and the episode is acute. Check documentation if the note distinguishes distal veins or a different limb.
Do not use for
Do not use it for chronic or old thrombosis, superficial vein thrombosis, or distal lower-extremity DVT. If the anatomic site is more specific, code that documented location instead.
Coding tip
Code only what the provider documents; unspecified site terms must match the record exactly.