ICD-10 Code I87.033 – Postthrombotic syndrome with ulcer and inflammation of bilateral lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I87.033 – Postthrombotic syndrome with ulcer and inflammation of bilateral lower extremity
What it is
I87.033 identifies chronic venous complications after prior thrombosis affecting both legs, with an ulcer and associated inflammation. Use it when documentation clearly states postthrombotic syndrome, bilateral lower extremity involvement, and an active ulcer.
Clinical signs
Typical findings include chronic leg swelling, skin discoloration, venous stasis changes, and a lower-extremity ulcer. Inflammation may be documented as redness, tenderness, or cellulitis-like changes; clinical features vary, so refer to documentation.
When to use this code
Use this code when the provider documents postthrombotic syndrome in both legs and specifically notes an ulcer with inflammation. It is appropriate for chronic sequelae of prior deep vein thrombosis, not for an acute clot alone. Check documentation if laterality or ulcer status is unclear.
Do not use for
Do not assign I87.033 for uncomplicated venous insufficiency, a history of thrombosis without postthrombotic syndrome, or a leg ulcer without the documented postthrombotic cause. Check documentation when inflammation is absent or not specified.
Coding tip
Confirm bilateral involvement and the presence of both ulcer and inflammation before coding, because those details drive this specific code.