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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 299.91 Unspecified pervasive developmental disorder residual state 299.91 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 299.* hierarchy