ICD-10 Code I82.B21 – Chronic embolism and thrombosis of right subclavian vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.B21 – Chronic embolism and thrombosis of right subclavian vein
What it is
This code identifies a long-standing blood clot or embolic blockage in the right subclavian vein. Use it when documentation specifies chronic thrombosis or chronic embolism affecting that vein.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records may note arm swelling, venous distention, pain, or evidence of impaired venous drainage on imaging.
When to use this code
Use I82.B21 when the provider documents chronic thrombosis or chronic embolism limited to the right subclavian vein. It is appropriate for follow-up visits, problem lists, or imaging-confirmed chronic venous occlusion when the side and chronicity are clearly stated.
Do not use for
Do not use this code for acute subclavian vein thrombosis or for thrombosis in another vein location. Check documentation if the record does not clearly identify the right side or chronic status.
Coding tip
Confirm both laterality and chronicity in the note before assigning I82.B21.