†ICD-9 and/or ICD-10 codes were used to identify cases. Cases identified with multiple qualifying codes were counted as single cases. TBI-related hospitalizations were identified using the following ICD-9-CM codes: 800.0801.9, 803.0804.9, 850.0854.1, 950.1950.3, 959.01, and 995.55. TBI-related hospitalizations that resulted in death and listed only a mortality code were identified using the following ICD-10 codes: S01.0S01.9, S02.0, S02.1, S02.3, S02.7S02.9, S04.0, S06.0S06.9, S07.0, S07.1, S07.8, S07.9, S09.7S09.9, T01.0, T02.0, T04.0, T06.0, T90.1, T90.2, T90.4, T90.5, T90.8, and T90.9. Although included in the case definition, T01.0, T02.0, T04.0, and T06.0 are considered invalid codes for use in the United States; however, only three cases were identified based exclusively on these four codes.