ICD-10 Code I80.252 – Phlebitis and thrombophlebitis of left calf muscular vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I80.252 – Phlebitis and thrombophlebitis of left calf muscular vein
What it is
This code identifies inflammation and clot formation in a muscular vein of the left calf. Use it when documentation specifies the left calf muscular vein rather than a superficial or unspecified lower-extremity vein.
Clinical signs
Typical findings include localized calf pain, tenderness, swelling, warmth, and sometimes redness. Clinical features vary; refer to documentation and any imaging or provider diagnosis supporting thrombophlebitis.
When to use this code
Use I80.252 when the provider documents phlebitis or thrombophlebitis in the left calf muscular vein. It is appropriate for confirmed lower-leg venous inflammation with thrombosis, including cases supported by ultrasound or specialist assessment. Check that the laterality and vein location are clearly stated.
Do not use for
Do not use this code for superficial thrombophlebitis, deep vein thrombosis in another site, or unspecified calf vein involvement. If the record does not identify the left calf muscular vein, check documentation.
Coding tip
Verify both laterality and vein type before coding, because unspecified or superficial vein documentation requires a different ICD-10-CM code.