ICD-10 Code I82.B29 – Chronic embolism and thrombosis of unspecified subclavian vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.B29 – Chronic embolism and thrombosis of unspecified subclavian vein
What it is
This code identifies a chronic blood clot or embolus in a subclavian vein when the side is not specified. Use it for an established, long-standing venous obstruction rather than an acute event.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings may include arm swelling, venous distention, pain, or prior imaging showing persistent thrombus in the subclavian vein.
When to use this code
Use I82.B29 when the record clearly documents chronic embolism or thrombosis of the subclavian vein and does not identify right or left side. It may apply after follow-up imaging or specialist assessment confirms an ongoing clot. Check documentation if the note describes only history, acute thrombosis, or another upper-extremity vein.
Do not use for
Do not use this code for acute subclavian vein thrombosis, superficial thrombophlebitis, or thrombosis in a different vein. If laterality is documented, choose the more specific code.
Coding tip
Verify whether the provider documented chronicity and laterality before assigning I82.B29.