ICD-10 Code I70.598 – Other atherosclerosis of nonautologous biological bypass graft(s) of the extremities, other extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.598 – Other atherosclerosis of nonautologous biological bypass graft(s) of the extremities, other extremity
What it is
This code identifies atherosclerotic narrowing or blockage in a nonautologous biological bypass graft in an extremity, when the affected limb site is not otherwise specified. Use it for graft disease documented in the arm or leg.
Clinical signs
Clinical features vary; refer to documentation. Findings may include reduced graft patency, diminished distal pulses, limb ischemic symptoms, or imaging evidence of atherosclerotic change in the bypass graft.
When to use this code
Use I70.598 when the provider documents atherosclerosis involving a nonautologous biological bypass graft in an extremity and the site is the “other” extremity category. This is appropriate when the record does not support a more specific laterality or anatomic code. Check documentation for graft type and exact limb location.
Do not use for
Do not use this code for native vessel atherosclerosis, graft infection, thrombosis without atherosclerosis, or unspecified peripheral artery disease. If the documentation does not confirm a biological bypass graft, check documentation.
Coding tip
Verify both the graft type and the extremity site before assigning I70.598.