Polydactyly, Postaxial, Type A9, is also known as polydactyly, postaxial, a9. An important gene associated with Polydactyly, Postaxial, Type A9 is CIBAR1 (CBY1 Interacting BAR Domain Containing 1). Related phenotypes are postaxial hand polydactyly and postaxial foot polydactyly