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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 > ICD-9-CM Diagnosis 850 Concussion A nonspecific term used to describe transient alterations or loss of consciousness following closed head injuries. The duration of UNCONSCIOUSNESS generally lasts a few seconds, but may persist for several hours. Concussions may be classified as mild, intermediate, and severe. Prolonged periods of unconsciousness (often defined as greater than 6 hours in duration) may be referred to as post-traumatic coma (COMA, POST-HEAD INJURY). (From Rowland, Merritt's Textbook of Neurology, 9th ed, p418) 850 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 850.0 Concussion with no loss of consciousness 850.0 is a specific code that can be used to specify a diagnosis 850.0 contains 4 index entries ICD-9-CM Diagnosis 850.1 Concussion with brief loss of consciousness 850.1 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 850.11 Concussion with loss of consciousness of 30 minutes or less 850.11 is a specific code that can be used to specify a diagnosis 850.11 contains 2 index entries ICD-9-CM Diagnosis 850.12 Concussion with loss of consciousness from 31 to 59 minutes 850.12 is a specific code that can be used to specify a diagnosis 850.12 contains 2 index entries ICD-9-CM Diagnosis 850.2 Concussion with moderate loss of consciousness 850.2 is a specific code that can be used to specify a diagnosis 850.2 contains 2 index entries ICD-9-CM Diagnosis 850.3 Concussion with prolonged loss of consciousness and return to pre-existing conscious level 850.3 is a specific code that can be used to specify a diagnosis 850.3 contains 2 index entries ICD-9-CM Diagnosis 850.4 Concussion with prolonged loss of consciousness without return to pre-existing conscious level 850.4 is a specific code that can be used to specify a diagnosis 850.4 contains 2 index entries ICD-9-CM Diagnosis 850.5 Concussion with loss of consciousness of unspecified duration 850.5 is a specific code that can be used to specify a diagnosis 850.5 contains 3 index entries ICD-9-CM Diagnosis 850.9 Concussion unspecified A nonspecific term used to describe transient alterations or loss of consciousness following closed head injuries. The duration of UNCONSCIOUSNESS generally lasts a few seconds, but may persist for several hours. Concussions may be classified as mild, intermediate, and severe. Prolonged periods of unconsciousness (often defined as greater than 6 hours in duration) may be referred to as post-traumatic coma (COMA, POST-HEAD INJURY). (From Rowland, Merritt's Textbook of Neurology, 9th ed, p418) 850.9 is a specific code that can be used to specify a diagnosis 850.9 contains 7 index entries