From: Protocol for a systematic review of prognosis after mild traumatic brain injury: an update of the WHO Collaborating Centre Task Force findings
ICD-9-CM first four digits
ICD-9-CM fifth digita
800.0, 800.5, 801.0, 801.5, 803.0, 803.5, 804.0, 804.5, 850.0, 850.1, 850.5 or 850.9
0, 1, 2, 6, 9, or missing
854.0
1, 2, 6, 9, or missing
959.0b
1