ICD-10 Code I82.819 – Embolism and thrombosis of superficial veins of unspecified lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.819 – Embolism and thrombosis of superficial veins of unspecified lower extremity
What it is
This code identifies a blood clot or blockage in a superficial vein of the lower leg or thigh when the affected side is not documented. Use it for superficial venous thrombosis, not deep vein disease.
Clinical signs
Typical findings include localized pain, tenderness, redness, warmth, or a palpable cord along a superficial vein. Clinical features vary; refer to documentation for laterality and whether the clot is confirmed.
When to use this code
Use this code when the record documents embolism or thrombosis in a superficial vein of an unspecified lower extremity and does not identify right or left. It fits outpatient or inpatient notes that confirm the diagnosis but leave laterality unclear. If the provider specifies a different venous site or deep vein involvement, code that condition instead.
Do not use for
Do not use it for deep vein thrombosis, upper-extremity superficial thrombosis, or varicose veins without thrombosis. Check documentation if the note only says “leg clot” or does not specify superficial vein involvement.
Coding tip
Verify both the vein type and laterality; if either is missing, confirm whether I82.819 is the best match.