Other malformations of cerebral vessels

This code represents congenital structural abnormalities of the cerebral vasculature that are not specifically classified elsewhere, such as arteriovenous malformations (AVMs), aneurysms, or Moyamoya disease. These malformations are present at birth and can involve arteries, veins, or capillaries within the brain. They may lead to various neurological symptoms depending on their size, location, and whether they rupture or cause mass effect.

Use this code for documented congenital cerebral vascular anomalies that do not fit more specific ICD-10-CM codes for cerebral AVMs (Q28.2), congenital cerebral aneurysms (Q28.3), or Moyamoya disease (I67.5). This includes conditions like cavernous malformations (cavernomas) or venous angiomas when congenital and located in the cerebrum. Documentation should clearly state the congenital nature and the specific type of cerebral vascular malformation if not otherwise classified.

• Do not use this code for acquired cerebral vascular malformations; these would typically fall under I67.- codes.
• Distinguish carefully between congenital cerebral aneurysms (Q28.3) and other congenital cerebral vascular malformations.
• Always review documentation for laterality and specific vessel involvement, although this code does not require laterality.