ICD-10 Code I82.B23 – Chronic embolism and thrombosis of subclavian vein, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.B23 – Chronic embolism and thrombosis of subclavian vein, bilateral
What it is
This code identifies a chronic blood clot or embolic blockage affecting both subclavian veins. It applies when the condition is longstanding, not acute, and documented as bilateral.
Clinical signs
Clinical features may include arm swelling, venous discomfort, or visible collateral veins. Clinical features vary; refer to documentation, and confirm bilateral subclavian vein involvement with chronic thrombosis or embolism.
When to use this code
Use this code when the record clearly states chronic embolism or thrombosis in both subclavian veins. It may also fit follow-up documentation of an established condition that remains present, even if the patient is not in an acute phase.
Do not use for
Do not use it for acute thrombosis, suspected clot without confirmation, or disease limited to one side. Check documentation if the note does not specify chronicity or bilateral involvement.
Coding tip
Verify both laterality and chronic status in the provider note before assigning I82.B23.