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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Mental Disorders 290-319 > Mental Retardation 317-319 > ICD-9-CM Diagnosis 318 Other specified mental retardation 318 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 318.0 Moderate mental retardation 318.0 is a specific code that can be used to specify a diagnosis 318.0 contains 6 index entries ICD-9-CM Diagnosis 318.1 Severe mental retardation 318.1 is a specific code that can be used to specify a diagnosis 318.1 contains 4 index entries ICD-9-CM Diagnosis 318.2 Profound mental retardation 318.2 is a specific code that can be used to specify a diagnosis 318.2 contains 5 index entries