ICD-10 Code I82.B1 – Acute embolism and thrombosis of subclavian vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.B1 – Acute embolism and thrombosis of subclavian vein
What it is
This code identifies an acute blood clot or embolus in the subclavian vein, the large vein beneath the collarbone. Use it when documentation clearly states an acute venous thrombosis or embolism in that vessel.
Clinical signs
Typical findings include arm swelling, pain, venous distention, or discoloration on the affected side. Clinical features vary; refer to documentation and confirm the clot is in the subclavian vein.
When to use this code
Use I82.B1 when the record documents an acute thrombosis or embolism specifically involving the subclavian vein. It may appear with upper-extremity venous symptoms, imaging confirmation, or specialist assessment. If the note says “acute” and names this vein, code it directly.
Do not use for
Do not use this code for chronic or old thrombosis, or when the clot is in a different vein. Check documentation if the vessel is not specified or if the diagnosis is only suspected.
Coding tip
Verify laterality and acuity in the chart, and code the exact vein named by the provider.