ICD-10 Code I80.223 – Phlebitis and thrombophlebitis of popliteal vein, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.223 – Phlebitis and thrombophlebitis of popliteal vein, bilateral
What it is
This code identifies inflammation of both popliteal veins, with or without a clot. It applies when documentation specifies bilateral involvement of the vein behind the knee.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings include leg pain, tenderness, swelling, warmth, or redness in the affected popliteal region, with imaging used to confirm venous thrombosis when present.
When to use this code
Use I80.223 when the provider documents phlebitis or thrombophlebitis involving both popliteal veins. It is appropriate for acute or subacute venous inflammation/thrombosis in this location when laterality is clearly bilateral. Check documentation if the record only says deep vein thrombosis without vein site.
Do not use for
Do not use this code for unilateral popliteal vein disease or for thrombosis in a different vein segment. If the chart does not identify the popliteal vein, or if the condition is superficial only, check documentation.
Coding tip
Confirm both the vein location and bilateral laterality in the provider note before assigning I80.223.