ICD-10 Code I82.A21 – Chronic embolism and thrombosis of right axillary vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.A21 – Chronic embolism and thrombosis of right axillary vein
What it is
This code identifies a chronic blood clot or embolic blockage in the right axillary vein, which drains blood from the upper arm and shoulder. Use it when the condition is documented as chronic or long-standing.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings include arm swelling, pain, heaviness, or venous congestion on the right side, with imaging or specialist assessment supporting the diagnosis.
When to use this code
Use I82.A21 when the provider documents chronic embolism, thrombosis, or chronic thrombus in the right axillary vein. It may also apply when a prior event is still active and specifically described as chronic. If laterality or chronicity is unclear, check documentation.
Do not use for
Do not use this code for acute upper-extremity thrombosis, superficial vein thrombosis, or thrombosis in a different vein location. If the record does not clearly state the right axillary vein, verify the site before coding.
Coding tip
Confirm both chronicity and right-sided location in the note before assigning I82.A21.