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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Mental Disorders 290-319 > Other Psychoses 295-299 > Pervasive Developmental Disorders 299.* > 2008 ICD-9-CM Diagnosis 299.1 Childhood disintegrative disorder  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 299.1 can be accessed here. 299.1 is a non-specific code that cannot be used to specify a diagnosis 299.1 contains 10 index entries View the ICD-9-CM Volume 1 299.* hierarchy 299.1 also known as: Heller's syndrome Use additional code to identify any associated neurological disorder 299.1 excludes: infantile autism (299.0) schizophrenic syndrome of childhood (299.9) Index entries containing 299.1: Dementia 294.8 Heller's (infantile psychosis) (see also Psychosis, childhood) 299.1 Disease, diseased - see also Syndrome Heller's (see also Psychosis, childhood) 299.1 Disorder - see also Disease disintegrative,childhood 299.1 interactional psychotic (childhood) (see also Psychosis, childhood) 299.1 Heller's disease or syndrome (infantile psychosis) (see also Psychosis, childhood) 299.1 Psychosis 298.9 disintegrative, childhood (see also Psychosis, childhood) 299.1 interactional (childhood) (see also Psychosis, childhood) 299.1 symbiotic (childhood) (see also Psychosis, childhood) 299.1 Syndrome - see also Disease dementia-aphonia, of childhood (see also Psychosis, childhood) 299.1 Heller's (infantile psychosis) (see also Psychosis, childhood) 299.1