ICD-10 Code I80.249 – Phlebitis and thrombophlebitis of unspecified peroneal vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.249 – Phlebitis and thrombophlebitis of unspecified peroneal vein
What it is
This code identifies inflammation of a peroneal vein with associated thrombosis in the leg, when the specific side or exact vein detail is not documented. Use it for a documented peroneal vein clot, not for general leg swelling.
Clinical signs
Typical findings include localized leg pain, tenderness, swelling, warmth, or redness along the affected calf. Clinical features vary; refer to documentation and imaging or provider assessment when recorded.
When to use this code
Use I80.249 when the provider documents phlebitis or thrombophlebitis involving a peroneal vein, but does not specify right or left. It also fits charted deep vein thrombosis of an unspecified peroneal vein if the record supports venous inflammation with clot. Check documentation if the note only says “DVT” without vein detail.
Do not use for
Do not use this code for superficial thrombophlebitis, varicose vein inflammation, or thrombosis in a different named vein. If the record identifies a right or left peroneal vein, choose the laterality-specific code instead.
Coding tip
Verify both the vessel name and laterality; unspecified codes are appropriate only when the documentation truly lacks that detail.