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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Injury And Poisoning 800-999 > Contusion With Intact Skin Surface 920-924 > Contusion Of Trunk 922.* > 2007 ICD-9-CM Diagnosis 922.31 Contusion of back  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 Therefore, this code may be out of date.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 922.31 can be accessed here. 922.31 is a specific code that can be used to specify a diagnosis 922.31 contains 2 index entries View the ICD-9-CM Volume 1 922.* hierarchy 922.31 excludes: interscapular region (922.33) Index entries containing 922.31: Contusion (skin surface intact) 924.9 back 922.31 lumbar region 922.31