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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Injury And Poisoning 800-999 > Other And Unspecified Effects Of External Causes 990-995 > Effects Of Reduced Temperature 991.* > 2007 ICD-9-CM Diagnosis 991.1 Frostbite of hand  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 Therefore, this code may be out of date.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 991.1 can be accessed here. 991.1 is a specific code that can be used to specify a diagnosis 991.1 contains 1 index entry View the ICD-9-CM Volume 1 991.* hierarchy Index entries containing 991.1: Frostbite 991.3 hand 991.1