ICD-10 Code I80.23 – Phlebitis and thrombophlebitis of tibial vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.23 – Phlebitis and thrombophlebitis of tibial vein
What it is
I80.23 identifies inflammation of a tibial vein with an associated clot. Use it when the documentation specifies the tibial vein as the site of the phlebitis or thrombophlebitis.
Clinical signs
Typical findings include leg pain, tenderness, swelling, and localized warmth along the affected vein. Clinical features vary; refer to documentation for the exact venous site and whether thrombosis is confirmed.
When to use this code
Use this code when the provider documents phlebitis or thrombophlebitis in a tibial vein, including a confirmed deep vein clot at that location. It also fits when imaging or the assessment clearly identifies the tibial vein as the involved vessel. Check documentation if the record only says lower-extremity DVT without a named vein.
Do not use for
Do not use this code for superficial thrombophlebitis, varicose vein inflammation, or clots in a different lower-extremity vein. If the site is not specified, check documentation before assigning I80.23.
Coding tip
Confirm the tibial vein is named in the final provider documentation, not just implied by leg symptoms or a generic DVT diagnosis.