ICD-10 Code I87.039 – Postthrombotic syndrome with ulcer and inflammation of unspecified lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I87.039 – Postthrombotic syndrome with ulcer and inflammation of unspecified lower extremity
What it is
This code identifies postthrombotic syndrome affecting an unspecified lower extremity, with both ulceration and inflammation present. It reflects chronic venous damage after prior thrombosis, not an acute clot.
Clinical signs
Typical findings include chronic leg swelling, skin discoloration, venous stasis changes, ulceration, and local inflammation. Clinical features vary; refer to documentation for the affected limb and whether the ulcer is active.
When to use this code
Use I87.039 when documentation states postthrombotic syndrome in an unspecified lower extremity and also describes an ulcer with inflammation. Choose this code when the record does not specify right or left leg. Make sure the provider links the ulcer and inflammatory changes to the postthrombotic condition.
Do not use for
Do not use this code for acute deep vein thrombosis, venous insufficiency without postthrombotic syndrome, or ulcers unrelated to venous disease. Check documentation if the leg laterality or ulcer cause is specified differently.
Coding tip
Verify that the note supports both ulcer and inflammation, because missing one element may require a different code.