Table 3. Top five grouped complications within the first year after TBI.

Rank	Combined complications (ICD-9-CM)	Frequency	%
1	Combination 1: 486 Pneumonia, organism unspecified 518.81 Acute respiratory failure 599.0 Urinary tract infection, site not specified	16,859	0.055
2	Combination 2: 038.9 Unspecified septicemia 486 Pneumonia, organism unspecified 518.81 Acute respiratory failure	12,988	0.042
3	Combination 3: 038.9 Unspecified septicemia 518.81 Acute respiratory failure 599.0 Urinary tract infection, site not specified	9,778	0.032
4	Combination 4: 038.9 Unspecified septicemia 486 Pneumonia, organism unspecified 599.0 Urinary tract infection, site not specified	8,423	0.027
5	Combination 5: 486 Pneumonia, organism unspecified 518.83 Chronic respiratory failure 599.0 Urinary tract infection, site not specified	6,535	0.021

Abbreviations: TBI, traumatic brain injury; ICD-9-CM, International Classification of Diseases, Ninth Revision, Clinical Modification.