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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Supplementary Classification Of Factors Influencing Health Status And Contact With Health Services V01-V86 > Liveborn Infants According To Type Of Birth V30-V39 > Twin Birth Mate Liveborn V31.* > 2007 ICD-9-CM Diagnosis V31.1 Twin birth mate liveborn born before admission to hospital  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 Therefore, this code may be out of date.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 V31.1 can be accessed here. V31.1 is a specific code that can be used to specify a diagnosis V31.1 contains 1 index entry View the ICD-9-CM Volume 1 V31.* hierarchy Index entries containing V31.1: Newborn (infant) (liveborn) twin NEC mate liveborn born outside hospital hospitalized V31.1