ICD-10 Code I70.398 – Other atherosclerosis of unspecified type of bypass graft(s) of the extremities, other extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.398 – Other atherosclerosis of unspecified type of bypass graft(s) of the extremities, other extremity
What it is
This code identifies atherosclerotic narrowing or blockage in an unspecified type of bypass graft in an extremity, affecting an other extremity not named elsewhere. Use it when the graft disease is documented, but the bypass type is not specified.
Clinical signs
Clinical features vary; refer to documentation. Findings may include reduced limb perfusion, claudication, rest pain, or diminished pulses, but the record should confirm graft atherosclerosis rather than native vessel disease.
When to use this code
Use this code when the provider documents atherosclerosis involving a bypass graft in an extremity and does not specify the graft type. It is also appropriate when the affected limb is documented as an other extremity, not a more specific site.
Assign it from operative notes, vascular follow-up, or imaging reports that clearly identify graft atherosclerosis. If the documentation names the graft type or a different vascular condition, code that more specific diagnosis instead.
Do not use for
Do not use this code for native artery atherosclerosis, graft occlusion without atherosclerosis, or bypass graft disease in a more specific extremity site. Check documentation.
Coding tip
Code the graft disease only when the record explicitly ties the atherosclerosis to the bypass graft and the extremity location is supported.