ICD-10 Code I82.A29 – Chronic embolism and thrombosis of unspecified axillary vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.A29 – Chronic embolism and thrombosis of unspecified axillary vein
What it is
This code identifies a chronic blood clot or embolus in the axillary vein when the affected side is not documented. Use it for long-standing venous obstruction in the upper extremity.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include arm swelling, pain, heaviness, or venous distention, and diagnosis is usually supported by imaging or prior history.
When to use this code
Assign this code when the record clearly states chronic embolism or thrombosis of the axillary vein and does not specify left or right. It is appropriate for established, persistent upper-extremity venous clotting. If the chart only says “history of clot” or the vein side is documented, code accordingly.
Do not use for
Do not use it for acute axillary vein thrombosis or for thrombosis in a different vein. If the condition is described as superficial, unspecified, or side-specific, check documentation.
Coding tip
Verify both chronicity and laterality before coding; unspecified side codes should be used only when the provider does not document left or right.