ICD-10 Code I82.B2 – Chronic embolism and thrombosis of subclavian vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.B2 – Chronic embolism and thrombosis of subclavian vein
What it is
This code identifies a long-standing blood clot or embolus in the subclavian vein, the large vein beneath the collarbone. Use it when documentation clearly states the condition is chronic and involves that specific vein.
Clinical signs
Clinical features may include arm swelling, venous congestion, pain, or visible collateral veins. Findings should support chronic venous obstruction; if the record is unclear, check documentation.
When to use this code
Use I82.B2 when the provider documents chronic embolism, chronic thrombosis, or both in the subclavian vein. It may also fit follow-up visits for an established chronic clot when the condition remains active and is being monitored.
Code it from imaging, specialist notes, or discharge summaries that specify the subclavian vein and chronicity. If the site is different or the record only says “history of clot,” do not assign this code.
Do not use for
Do not use this code for acute subclavian vein thrombosis, superficial vein disease, or unspecified venous thrombosis. If the documentation does not confirm chronic involvement of the subclavian vein, check documentation.
Coding tip
Match both elements: chronic status and exact vein location; if either is missing, query the record before coding.