ICD-10 Code I70.9 – Other and unspecified atherosclerosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.9 – Other and unspecified atherosclerosis
What it is
I70.9 identifies atherosclerosis when the affected vessel is not specified or the record only states “other” atherosclerosis. Use it for documented arterial plaque disease without a more precise site.
Clinical signs
Clinical features vary; refer to documentation. Findings may include evidence of arterial narrowing, reduced blood flow, or vascular disease noted on imaging, exam, or prior history.
When to use this code
Use I70.9 when the provider documents atherosclerosis but does not identify the artery or a more specific atherosclerotic subtype. It may also fit when the record states unspecified atherosclerosis and no further detail is available. Check documentation for laterality, vessel, and complication details before assigning this code.
Do not use for
Do not use this code when the documentation names a specific artery, such as coronary, carotid, or peripheral vessel disease. Also avoid it if the condition is better described by another atherosclerosis code or by a different vascular diagnosis.
Coding tip
Before coding I70.9, scan the note for a more specific vessel, site, or complication that would support a more precise ICD-10-CM code.