ICD-10 Code I80.22 – Phlebitis and thrombophlebitis of popliteal vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.22 – Phlebitis and thrombophlebitis of popliteal vein
What it is
I80.22 identifies inflammation and clot formation in the popliteal vein behind the knee. Use it when documentation specifies thrombophlebitis or phlebitis in that vein.
Clinical signs
Clinical features may include leg pain, tenderness, swelling, warmth, and redness near the knee or calf. Imaging or provider documentation should support the popliteal vein location; clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly states phlebitis or thrombophlebitis of the popliteal vein, including acute or unspecified cases if no more specific code is documented. Code the site exactly as recorded. If the provider documents a related deep vein thrombosis elsewhere, choose the code that matches the stated vein.
Do not use for
Do not use I80.22 for superficial thrombophlebitis, venous insufficiency, or clotting in a different leg vein. Check documentation if the note only says DVT without naming the popliteal vein.
Coding tip
Always verify the vein location and whether the condition is phlebitis, thrombophlebitis, or another venous diagnosis before assigning I80.22.