ICD-10 Code I80.202 – Phlebitis and thrombophlebitis of unspecified deep vessels of left lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.202 – Phlebitis and thrombophlebitis of unspecified deep vessels of left lower extremity
What it is
This code identifies inflammation and clot formation in a deep vein of the left lower leg or thigh when the exact deep vessel is not specified. Use it when documentation confirms the left side but does not name a more specific vein.
Clinical signs
Common findings include unilateral left leg pain, swelling, warmth, tenderness, or redness. Clinical features vary; refer to documentation, and confirm that the provider describes a deep venous thrombosis or thrombophlebitis in the left lower extremity.
When to use this code
Use I80.202 when the record states phlebitis or thrombophlebitis involving an unspecified deep vein on the left side and no more specific vessel is documented. It also fits when imaging or provider assessment confirms deep vein involvement, but the exact vein is not named. If the note identifies a more specific deep vein, code that instead.
Do not use for
Do not use this code for superficial thrombophlebitis, right-sided disease, or unspecified laterality. Check documentation if the record only says “DVT” without confirming the left lower extremity or deep vessel.
Coding tip
Code the most specific vein and laterality available; if the left deep vessel is not named, this code is appropriate.