ICD-10 Code I80.8 – Phlebitis and thrombophlebitis of other sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.8 – Phlebitis and thrombophlebitis of other sites
What it is
I80.8 identifies inflammation of a vein with associated clot formation in sites other than the common leg veins covered by more specific codes. Use it when the record clearly documents phlebitis or thrombophlebitis at another venous location.
Clinical signs
Typical findings include localized pain, tenderness, swelling, redness, or a palpable cord along the affected vein. Clinical features vary; refer to documentation, especially when the site is unusual or not fully specified.
When to use this code
Use I80.8 when the provider documents phlebitis or thrombophlebitis in an “other site” and no more specific ICD-10-CM code applies. It is appropriate when the anatomic location is clear enough to support this category but not a site with its own code. Check documentation if the note only says “thrombophlebitis” without location.
Do not use for
Do not use this code for superficial or deep vein thrombosis when a more specific code is documented. Also avoid it when the site is unspecified or when the condition is unrelated to venous inflammation or clotting.
Coding tip
Verify the exact vein site in the note before assigning I80.8, because a more specific code may be available.