ICD-10 Code I82.A12 – Acute embolism and thrombosis of left axillary vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.A12 – Acute embolism and thrombosis of left axillary vein
What it is
This code identifies an acute blood clot or embolus blocking the left axillary vein, which drains blood from the arm. Use it when documentation clearly states an acute thrombotic or embolic event in that vein.
Clinical signs
Typical findings include unilateral arm swelling, pain, tenderness, and sometimes discoloration or visible superficial veins. Clinical features vary; refer to documentation and imaging or clinician assessment when available.
When to use this code
Use I82.A12 when the record specifies acute embolism or thrombosis of the left axillary vein, including confirmed upper-extremity deep vein thrombosis in that location. Apply it when laterality and acuity are documented. If the note is unclear, check documentation before coding.
Do not use for
Do not use this code for chronic or old thrombosis, or for clots in a different vein location. If the record only says “arm swelling” or “DVT” without site or acuity, check documentation.
Coding tip
Verify both laterality and acute status in the provider note before assigning this code.