Arteriovenous fistula, acquired

This code describes an abnormal, direct connection between an artery and a vein that develops after birth. This bypasses the capillary bed, leading to altered blood flow dynamics and potential complications in the affected area.

Use this code for documented cases of arteriovenous fistulas that are not congenital in origin. This includes fistulas resulting from trauma, iatrogenic causes (e.g., post-catheterization), or pathological processes like erosion from an aneurysm. Documentation should clearly state the acquired nature of the fistula.

• Differentiate carefully from congenital arteriovenous malformations (Q27.3x in ICD-10-CM, or 747.6 in ICD-9-CM).
• Specify the anatomical site of the fistula if further detail is available in the documentation.
• Consider additional codes for any underlying cause (e.g., trauma, surgical complication) or associated complications (e.g., heart failure, limb ischemia).