Autoimmune Encephalitis

Autoimmune Encephalitis is indexed under Autoimmune & Inflammatory, Neuroimmune. Also known as anti-NMDA receptor encephalitis, limbic encephalitis.

US prevalence

~13.7 per 100,000; increasing recognition Source: AE Alliance; Dubey et al. Ann Neurol 2018. This figure comes from a professional society, registry, or study rather than a federal source. Label: REPORTED.

ICD-10-CM codes

G04.81

Typical onset

Anti-NMDAR: young women/children; LGI1: older adults

Course

managed

Body systems

neurological

Sex differences

Anti-NMDAR: F:M ~4:1; LGI1: M:F ~2:1

Racial and ethnic differences

Limited data

What this page does not establish

These figures describe populations, not individuals, and none of them is a diagnosis or a treatment recommendation. Prevalence estimates are approximate and reflect published ranges. Disparity figures are reported patterns, not causes.

Taxonomy last reviewed 2026-05-19. Each figure on the interactive page carries its own source and retrieval date, which can be later than this review.

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