2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Mental Disorders 290-319 > Mental Retardation 317-319 > Other Specified Mental Retardation 318.* >  2008 ICD-9-CM Diagnosis 318.1
Severe mental retardation 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 Therefore, this code may be out of date.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 318.1 can be accessed here. - 318.1 is a specific code that can be used to specify a diagnosis
- 318.1 contains 4 index entries
- View the ICD-9-CM Volume 1 318.* hierarchy
318.1 also known as:- IQ 20-34
- Severe mental subnormality
Index entries containing 318.1:- IQ
- 20-34
 318.1
Mental - see also condition- subnormality (see also Retardation, mental) 319
- severe 318.1
Retardation- mental 319
- severe, IQ 20-34 318.1
Subnormal, subnormality- mental (see also Retardation, mental) 319
- severe 318.1
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