ICD-10 Code I82.B12 – Acute embolism and thrombosis of left subclavian vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.B12 – Acute embolism and thrombosis of left subclavian vein
What it is
This code identifies an acute blood clot or embolus in the left subclavian vein. It means the obstruction is in the vein beneath the left collarbone and is newly present or recently developed.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include left arm swelling, pain, heaviness, and visible venous distention, with imaging used to confirm venous obstruction.
When to use this code
Use I82.B12 when the provider documents acute thrombosis or embolism specifically in the left subclavian vein. Apply it for confirmed cases, including imaging-supported diagnosis or clear clinical documentation of an acute event. Check documentation if laterality or acuity is unclear.
Do not use for
Do not use this code for chronic, old, or unspecified upper-extremity venous thrombosis. It is also not appropriate when the clot is documented in a different vein or the side is not left.
Coding tip
Confirm both acuity and laterality in the provider note before assigning I82.B12.