ICD-10 Code I80.221 – Phlebitis and thrombophlebitis of right popliteal vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.221 – Phlebitis and thrombophlebitis of right popliteal vein
What it is
This code identifies inflammation and clot formation in the right popliteal vein, the deep vein behind the knee. Use it when the documentation specifically names the right popliteal vein.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include unilateral leg pain, swelling, tenderness, warmth, or redness, with imaging or exam supporting deep vein involvement.
When to use this code
Use I80.221 when the provider documents phlebitis or thrombophlebitis limited to the right popliteal vein. It is appropriate for confirmed deep venous inflammation or thrombosis in that location. Check documentation if the record only states lower-extremity DVT without site.
Do not use for
Do not use this code for superficial thrombophlebitis, left-sided disease, or unspecified lower-extremity vein involvement. If the vein site is not documented, choose a more general code.
Coding tip
Verify laterality and the exact vein named in the note before assigning I80.221.