ICD-10 Code I87.012 – Postthrombotic syndrome with ulcer of left lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I87.012 – Postthrombotic syndrome with ulcer of left lower extremity
What it is
This code identifies postthrombotic syndrome affecting the left leg, with a documented ulcer. It reflects chronic venous damage after prior thrombosis, complicated by an ulcer on the left lower extremity.
Clinical signs
Typical findings include chronic leg swelling, skin discoloration, venous stasis changes, and a persistent ulcer on the left lower leg or ankle. Clinical features vary; refer to documentation.
When to use this code
Use I87.012 when the record clearly links postthrombotic syndrome to an ulcer on the left lower extremity. The ulcer should be documented as part of the condition, not as a separate unspecified wound. If laterality or the thrombotic history is unclear, check documentation.
Do not use for
Do not use this code for ulcers without postthrombotic syndrome, or for postthrombotic syndrome without an ulcer. Check documentation if the ulcer is on another limb or if the cause is not confirmed.
Coding tip
Confirm both the left-sided location and the ulcer association before assigning I87.012.