Question: The physician documented that the patient has a congenital aneurysm associated with an arteriovenous malformation. Which ICD-10 code should we report? Pennsylvania Subscriber Answer: You should report Q28.2 (Arteriovenous malformation of cerebral vessels) when the patient’s congenital aneurysm is associated with an arteriovenous malformation. Arteriovenous malformation of brain NOS and nonruptured congenital arteriovenous cerebral aneurysm are also included diagnoses under Q28.2.