ICD-10 Code I87.023 – Postthrombotic syndrome with inflammation of bilateral lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I87.023 – Postthrombotic syndrome with inflammation of bilateral lower extremity
What it is
This code identifies postthrombotic syndrome affecting both lower extremities, with inflammation noted. It reflects chronic venous damage after prior thrombosis, leading to ongoing leg symptoms.
Clinical signs
Typical findings include bilateral leg swelling, heaviness, pain, skin discoloration, and signs of chronic venous insufficiency. Clinical features vary; refer to documentation.
When to use this code
Use I87.023 when the provider documents postthrombotic syndrome in both legs and specifically notes inflammation. You should code it when the record links the current venous condition to prior thrombosis rather than an acute clot. Check documentation if laterality or inflammatory involvement is unclear.
Do not use for
Do not use this code for acute deep vein thrombosis or for nonspecific leg edema without documented postthrombotic syndrome. It is also not appropriate if the condition is unilateral or inflammation is not documented.
Coding tip
Confirm both laterality and the postthrombotic diagnosis in the provider note before assigning I87.023.