ICD-10 Code I82.9 – Embolism and thrombosis of unspecified vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.9 – Embolism and thrombosis of unspecified vein
What it is
I82.9 identifies a clot or blockage in a vein when the specific vein is not named in the record. Use it for venous embolism or thrombosis documented without further anatomic detail.
Clinical signs
Clinical features vary; refer to documentation. Typical venous thrombosis may present with swelling, pain, tenderness, or redness in the affected area, but the chart must support the diagnosis.
When to use this code
Use I82.9 when the provider documents embolism or thrombosis of a vein but does not identify the site. It also fits when imaging or assessment confirms venous clotting, yet the note remains nonspecific. If the record names a more precise vein, code that instead.
Do not use for
Do not use this code for arterial embolism or thrombosis, superficial phlebitis, or conditions with a clearly specified vein. Check documentation if the note distinguishes acute from chronic or identifies a different vascular site.
Coding tip
Query for the exact vein involved whenever possible; unspecified vein codes should be a last resort.