ICD-10 Code I77.77 – Dissection of artery of lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I77.77 – Dissection of artery of lower extremity
What it is
This code identifies a dissection in an artery supplying the lower extremity, meaning the arterial wall has separated and blood has tracked between its layers. It is a vascular diagnosis, not a wound or musculoskeletal injury.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include leg pain, reduced pulse, limb ischemia, or imaging evidence of arterial wall separation in the lower extremity.
When to use this code
Use I77.77 when the provider documents a dissection of a lower-extremity artery, such as femoral, popliteal, or another leg artery. The record should clearly identify the vessel and confirm dissection, often by vascular imaging or specialist assessment. Code it only when the condition is explicitly documented.
Do not use for
Do not use this code for arterial occlusion, embolism, aneurysm, or nonspecific peripheral vascular disease unless dissection is documented. Check documentation if the note only describes limb ischemia or pain.
Coding tip
Verify the exact artery and avoid assigning this code from symptoms alone; the documentation must state dissection.