Autoimmune Gastritis / Pernicious Anemia

Autoimmune Gastritis / Pernicious Anemia is indexed under Gastrointestinal, Autoimmune GI. Also known as pernicious anemia, vitamin B12 deficiency autoimmune.

US prevalence

~2-5% of elderly; pernicious anemia ~0.1-0.2% overall Source: AGA; NIH. Cites federal and non-federal sources, and the record does not say which one gave this figure. Label: REPORTED.

ICD-10-CM codes

D51.0, K29.4

Typical onset

Typically >60

Course

lifelong

Body systems

gastrointestinal, hematologic, neurological

Sex differences

F:M ~1.5:1

Racial and ethnic differences

Higher in Northern European and African descent

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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