ICD-10 Code I80.293 – Phlebitis and thrombophlebitis of other deep vessels of lower extremity, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.293 – Phlebitis and thrombophlebitis of other deep vessels of lower extremity, bilateral
What it is
This code identifies inflammation and clot formation in deep veins of both lower legs or thighs, involving veins other than the main femoral or popliteal vessels. Use it when documentation clearly states bilateral deep venous thrombophlebitis.
Clinical signs
Typical findings include leg pain, swelling, tenderness, warmth, or redness, but clinical features vary; refer to documentation. Imaging such as venous ultrasound is commonly used to confirm deep vein involvement.
When to use this code
Use I80.293 when the provider documents phlebitis or thrombophlebitis in other deep veins of both lower extremities. It may appear in assessments, discharge summaries, or imaging reports that specify bilateral deep venous disease. Check documentation if the vein location is unclear.
Do not use for
Do not use this code for superficial thrombophlebitis or for deep vein thrombosis limited to a different named vessel. If only one leg is involved, select the unilateral code instead.
Coding tip
Confirm both the bilateral site and the deep-vein location before assigning I80.293.