A joint study by health specialists from the University of Washington, National University in San Diego, and John Hopkins Bloomberg School of Public Health in Baltimore investigated the reliability of the Occupational Injury and Illness Classification System (OIICS) in identifying work-related traumatic brain injury (TBI).
The researchers cross-referenced trauma registry reports and worker's compensation claims filed in Washington State between the years 1998 and 2008; they found that by using trauma registry diagnoses to define TBI cases in OIICS, coders at The Washington State Department of Labor and Industries had diagnosed less than a third of cases of fatal and non-fatal traumatic brain injury.
Compared to the CDC's International Classification of Diseases-Ninth Revision-Clinical Modification codes, OIICS underestimates the cases and attributable causes of TBI; and necessitates a more accurate method of reporting cases of work-related TBI in the U.S.
Sears, J M, Graves, J M, et al. Case identification of work-related traumatic brain injury using the occupational injury and illness classification system. Journal of Occupational and Environmental Medicine. (May 2013).