ICD-10 Code I79.8 – Other disorders of arteries, arterioles and capillaries in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I79.8 – Other disorders of arteries, arterioles and capillaries in diseases classified elsewhere
What it is
This code identifies arterial, arteriolar, or capillary disorders that are caused by another underlying disease. Use it when the vascular problem is documented as secondary and no more specific code applies.
Clinical signs
Clinical features vary; refer to documentation. You may see signs of poor blood flow, vessel narrowing, or small-vessel involvement related to the primary condition.
When to use this code
Use I79.8 when the record links an artery, arteriole, or capillary disorder to another disease, such as a systemic or localized condition, and the provider does not identify a more specific vascular code. Code the underlying disease first when required by the note set.
Do not use for
Do not use this code for primary vascular disorders, or when a more specific code describes the condition. If the documentation does not clearly state a secondary cause, check documentation.
Coding tip
Look for the phrase “in diseases classified elsewhere” and verify the underlying cause before assigning I79.8.