ICD-10 Code I80.1 – Phlebitis and thrombophlebitis of femoral vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.1 – Phlebitis and thrombophlebitis of femoral vein
What it is
I80.1 identifies inflammation of the femoral vein with associated clot formation. Use it when the documentation specifies phlebitis or thrombophlebitis in the femoral vein.
Clinical signs
Typical findings include localized pain, tenderness, swelling, warmth, and redness along the affected leg. Clinical features vary; refer to documentation, and confirm the femoral vein is the site involved.
When to use this code
Use this code when the provider documents femoral vein thrombophlebitis, femoral phlebitis, or an equivalent diagnosis. It also fits cases where imaging or clinical assessment supports clot-related inflammation in that vein.
Code it from the medical record, not from suspected leg pain alone. If the note names a different vein or a broader deep vein thrombosis diagnosis, check documentation before assigning I80.1.
Do not use for
Do not use I80.1 for superficial thrombophlebitis, unspecified venous thrombosis, or DVT in another location. Check documentation if the record does not clearly identify the femoral vein.
Coding tip
Always verify the exact vein named in the assessment; site specificity determines whether I80.1 is correct.