ICD-10 Code I87.09 – Postthrombotic syndrome with other complications (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I87.09 – Postthrombotic syndrome with other complications
What it is
Use this code for postthrombotic syndrome, a chronic venous disorder that develops after a prior deep vein thrombosis. It indicates ongoing venous damage with complications not captured by more specific postthrombotic syndrome codes.
Clinical signs
Typical findings include leg swelling, pain, heaviness, skin discoloration, and venous stasis changes after a history of venous thrombosis. Clinical features vary; refer to documentation.
When to use this code
Assign I87.09 when the record documents postthrombotic syndrome with complications and no more specific code fits the described condition. Use it for chronic sequelae of prior thrombosis affecting venous function, especially when the provider notes persistent symptoms or complications. Check documentation for laterality and specificity.
Do not use for
Do not use this code for acute deep vein thrombosis, uncomplicated varicose veins, or general leg edema without postthrombotic syndrome. If the complication is specified elsewhere, code that condition instead.
Coding tip
Look for a documented history of thrombosis plus chronic venous complications before selecting I87.09.