ICD-10 Code I80.03 – Phlebitis and thrombophlebitis of superficial vessels of lower extremities, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.03 – Phlebitis and thrombophlebitis of superficial vessels of lower extremities, bilateral
What it is
I80.03 identifies inflammation and clotting in the superficial veins of both lower extremities. Use it when documentation states superficial phlebitis or thrombophlebitis affecting both legs.
Clinical signs
Typical findings include localized pain, tenderness, redness, warmth, and a palpable cord along a superficial vein. Clinical features vary; refer to documentation.
When to use this code
Use I80.03 when the provider documents superficial thrombophlebitis or phlebitis in both lower extremities. It is appropriate when the bilateral location is clearly stated, or when both legs are specifically described as involved. Check documentation if the record does not clearly distinguish superficial from deep venous disease.
Do not use for
Do not use this code for deep vein thrombosis, upper-extremity disease, or unilateral superficial vein involvement. If the site or laterality is unclear, check documentation.
Coding tip
Verify both “superficial” and “bilateral” in the note before assigning I80.03.