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ICD 850-850.99 - consistent with concussion (i.e., no detected injury by CT) Admitted to hospital. AIS score 2 before 2008 or 1/2 in 2008. ICD-9 code for SAH. Exclusion criteria: Patient admitted directly to hospital. Multiple injuries AIS score >1 head or other regions. Age < 18 years. Not admitted ................
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