ICD-10 Code I80.2 – Phlebitis and thrombophlebitis of other and unspecified deep vessels of lower extremities (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.2 – Phlebitis and thrombophlebitis of other and unspecified deep vessels of lower extremities
What it is
I80.2 identifies inflammation and clot formation in deep veins of the lower extremities when the involved vein is other or not further specified. Use it for deep venous thrombophlebitis documented in the leg, not superficial vein disease.
Clinical signs
Typical documentation includes leg pain, swelling, tenderness, warmth, or a palpable cord in a deep vein distribution. Clinical features vary; refer to documentation and imaging or provider assessment when available.
When to use this code
Use this code when the provider documents deep phlebitis or thrombophlebitis in a lower extremity vein and does not name a more specific site. It also fits unspecified deep venous involvement in the leg. If the record identifies a different vessel or laterality-specific detail, code accordingly and follow documentation.
Do not use for
Do not use I80.2 for superficial thrombophlebitis, varicose veins with inflammation, or thrombosis in non-lower-extremity sites. Check documentation if the record only says “DVT” without confirming phlebitis or thrombophlebitis.
Coding tip
Look for the vein location and whether the provider means deep or superficial disease before assigning I80.2.