Congenital dyserythropoietic anemiatype I (CDA I) is a hematologic disorder of erythropoiesis characterized by moderate to severe macrocytic anemia occasionally associated with limb or nail deformities and scoliosis. The disease is Orphanet rare-disease nomenclature id Orphanet_98869 (Congenital dyserythropoietic anemia type I). Also known as: CDA I, CDA type 1, CDA type I, Congenital dyserythropoietic anemia type 1.