Cerebral amyloid angiopathy

This code represents cerebral amyloid angiopathy (CAA), a condition characterized by the deposition of amyloid-beta protein in the walls of small and medium-sized arteries, arterioles, and capillaries of the cerebral cortex and leptomeninges. This protein accumulation weakens vessel walls, increasing the risk of intracerebral hemorrhage and ischemic events.

Use this code for patients diagnosed with CAA, often presenting with recurrent lobar intracerebral hemorrhages, transient focal neurological episodes, or cognitive impairment. Documentation supporting this diagnosis typically includes neuroimaging findings (e.g., MRI showing lobar microbleeds, superficial siderosis) and, in some cases, brain biopsy results.

• Differentiate from other forms of amyloidosis affecting the brain; this code is specific to cerebral amyloid angiopathy.
• Code any associated neurological manifestations (e.g., intracerebral hemorrhage, dementia) separately and sequence according to the reason for the encounter.
• Ensure documentation clearly states "cerebral amyloid angiopathy" rather than just "amyloidosis" to support this specific code.