ICD-10 Code I87.019 – Postthrombotic syndrome with ulcer of unspecified lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I87.019 – Postthrombotic syndrome with ulcer of unspecified lower extremity
What it is
I87.019 identifies postthrombotic syndrome affecting an unspecified lower extremity, with an associated ulcer. It reflects chronic venous damage after prior thrombosis, leading to impaired circulation and skin breakdown.
Clinical signs
Typical findings include chronic leg swelling, pain, heaviness, skin discoloration, and venous ulceration. Clinical features vary; refer to documentation for the affected side and evidence of prior thrombosis.
When to use this code
Use this code when the provider documents postthrombotic syndrome and a venous ulcer in an unspecified lower extremity. It is appropriate when the record does not identify right or left leg, but does support the diagnosis.
Assign it only when the ulcer is linked to the postthrombotic condition. If the documentation describes a different ulcer cause or a specified extremity, code to the more precise option.
Do not use for
Do not use this code for venous ulcers without postthrombotic syndrome, or for ulcers of a specified lower extremity when laterality is documented. Check documentation.
Coding tip
Look for explicit provider linkage between the prior thrombosis, postthrombotic syndrome, and the ulcer before assigning I87.019.