pervasive developmental disorder childhood disintegrative disease A pervasive developmental disorder that is a rare condition characterized by late onset (>3 years of age) of developmental delays in language, social function, and motor skills where children who have had previously normal development who then appear to regress. DOID:13487 Disintegrative psychosis NOS (disorder) Heller's syndrome ICD9CM:299.1 SNOMEDCT_2010_1_31:191694008 SNOMEDCT_2010_1_31:192584009 SNOMEDCT_2010_1_31:71961003 Symbiotic psychosis UMLS_CUI:C0236791 disease_ontology