ICD-10 Code I80.243 – Phlebitis and thrombophlebitis of peroneal vein, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.243 – Phlebitis and thrombophlebitis of peroneal vein, bilateral
What it is
This code identifies inflammation of the peroneal veins in both legs, with associated clot formation or thrombosis. Use it when documentation specifies bilateral peroneal vein phlebitis or thrombophlebitis.
Clinical signs
Typical findings include leg pain, swelling, tenderness, warmth, or redness along the affected veins. Clinical features vary; refer to documentation and confirm that both peroneal veins are involved.
When to use this code
Use I80.243 when the provider documents bilateral peroneal vein thrombophlebitis, superficial or deep venous inflammation with thrombosis in both legs, or an equivalent diagnosis. You should code from the documented vein location and laterality, not from suspected DVT alone.
Do not use for
Do not use this code for unilateral peroneal vein disease, unspecified leg involvement, or thrombosis in a different vein. Check documentation if the note only says “DVT” without naming the peroneal vein.
Coding tip
Verify both the vein site and bilateral laterality in the provider note before assigning I80.243.