Caring for someone with this diagnosis? Eleplan keeps diagnoses, medications, documents and every specialist in one plan.
Start free with EleplanPostaxial polydactyly type A
ORPHA:93334Morphological anomaly
What it is
A rare congenital limb malformation characterized by duplication of the fifth digit in a hand or foot, with an extra, well-formed, functional digit at the metacarpophalangeal/metatarsophalangeal or carpometacarpal/tarsometatarsal joint. The malformation can be an isolated finding or be associated with a large number of other anomalies.
Key facts
- Prevalence
- 1-5 / 10 000 (Mexico)
- Age of onset
- Antenatal
- Inheritance
- Autosomal recessive
- Classified as
- Morphological anomaly
Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.
Genes
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
Powered by Eleplan
A rare diagnosis is just the start. Eleplan keeps the whole care plan in one place.
Diagnoses, medications, documents, appointments, and the whole care team — organized and always in sync, so you are not retelling the same story to every new specialist. With Ellie, your AI care assistant, on top of it. Free to start.