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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Injury And Poisoning 800-999 > Intracranial Injury, Excluding Those With Skull Fracture 850-854 > Concussion 850.* > 2007 ICD-9-CM Diagnosis 850.1 Concussion with brief loss of consciousness  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 Therefore, this code may be out of date.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 850.1 can be accessed here. 850.1 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 850.* hierarchy 850.1 also known as: Loss of consciousness for less than one hour