Myotonic Dystrophy

Myotonic Dystrophy is indexed under Rare / Orphan Chronic, Neuromuscular. Also known as DM1, DM2, Steinert disease.

US prevalence

Myotonic dystrophy affects at least ~1 in 8,000 people worldwide; relative frequency of type 1 versus type 2 varies by population Source: NIH MedlinePlus Genetics — Myotonic dystrophy. This figure comes from a professional society, registry, or study rather than a federal source. Label: REPORTED.

ICD-10-CM codes

G71.11, G71.12

Typical onset

DM1: any age (anticipation); DM2: 30-60

Course

progressive

Body systems

musculoskeletal, cardiovascular, neurological

Sex differences

Equal (autosomal dominant)

Racial and ethnic differences

DM1 common worldwide; DM2 primarily European

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.

Browse all indexed conditions · Source registry · Methodology · Known limitations