ICD-10 Code I87.0 – Postthrombotic syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I87.0 – Postthrombotic syndrome
What it is
Postthrombotic syndrome is a chronic venous condition that can follow deep vein thrombosis. It reflects long-term damage to the veins and valves, leading to impaired blood return in the affected limb.
Clinical signs
Typical findings include chronic leg swelling, pain, heaviness, skin discoloration, and venous stasis changes. Clinical features vary; refer to documentation for evidence of prior thrombosis and persistent venous symptoms.
When to use this code
Use I87.0 when the record documents postthrombotic syndrome or postphlebitic changes as the diagnosed cause of chronic venous symptoms. It is appropriate when the provider links ongoing edema, pain, or skin changes to prior thrombosis. Check documentation if the chart only notes a history of DVT without current syndrome.
Do not use for
Do not use this code for acute deep vein thrombosis, superficial thrombophlebitis, or nonspecific leg swelling without a documented postthrombotic syndrome diagnosis. Check documentation if the venous disorder is not clearly related to prior thrombosis.
Coding tip
Assign I87.0 only when the provider documents the chronic postthrombotic condition, not merely a past clot.