ICD-10 Code I70.399 – Other atherosclerosis of unspecified type of bypass graft(s) of the extremities, unspecified extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.399 – Other atherosclerosis of unspecified type of bypass graft(s) of the extremities, unspecified extremity
What it is
This code identifies atherosclerotic disease in a bypass graft supplying an extremity when the graft type and affected limb are not specified. Use it for documented graft narrowing or plaque-related disease involving the bypass conduit.
Clinical signs
Clinical features vary; refer to documentation. Patients may have reduced limb perfusion, exertional pain, diminished pulses, or graft-related ischemic findings noted on exam or imaging.
When to use this code
Use I70.399 when the record states atherosclerosis of an extremity bypass graft but does not identify the graft type or which limb is involved. It is appropriate when the provider documents graft disease, stenosis, or occlusion related to atherosclerosis and no more specific code is available.
If laterality or graft type is documented, code to the more specific option instead. Check documentation for whether the condition is native-artery disease, graft failure, or another vascular complication.
Do not use for
Do not use this code for atherosclerosis of native extremity arteries or for nonatherosclerotic graft complications. If the chart specifies the graft type or extremity, select the more precise code.
Coding tip
Review operative notes and vascular imaging carefully; unspecified coding is appropriate only when the record truly lacks graft type or extremity detail.