ICD-10 Code I77.9 – Disorder of arteries and arterioles, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I77.9 – Disorder of arteries and arterioles, unspecified
What it is
I77.9 identifies a disorder affecting the arteries or arterioles when the specific vascular condition is not named in the record. Use it for a nonspecific arterial diagnosis that does not fit a more exact code.
Clinical signs
Clinical features vary; refer to documentation. Findings may include nonspecific arterial abnormalities, but the chart should state the vessel disorder rather than only symptoms.
When to use this code
Use I77.9 when the provider documents an arterial or arteriolar disorder without further detail and no more specific ICD-10-CM option is supported. It is appropriate when the diagnosis is confirmed but the exact type, site, or cause is not documented. Check documentation if the note is vague.
Do not use for
Do not use this code when the record names a specific arterial disease, such as stenosis, aneurysm, dissection, or atherosclerosis. Do not use it for symptoms alone without a documented vascular disorder.
Coding tip
Query for the exact vessel disorder before defaulting to this unspecified code.