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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Supplementary Classification Of Factors Influencing Health Status And Contact With Health Services V01-V86 > Persons With Potential Health Hazards Related To Personal And Family History V10-V19 > Family History Of Certain Other Specific Conditions V18.* > 2008 ICD-9-CM Diagnosis V18.4 Family history of 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 Therefore, this code may be out of date.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 V18.4 can be accessed here. V18.4 is a specific code that can be used to specify a diagnosis V18.4 contains 2 index entries View the ICD-9-CM Volume 1 V18.* hierarchy Index entries containing V18.4: History (personal) of family mental retardation V18.4 retardation, mental V18.4