Eight hospitals currently submit syndromic surveillance ED data to Nebraska Department of Health and Human Services (NeDHHS), representing approximately 18% of all ED visits for the state. Five hospitals reported complete data for the selected study period, June 1, 2010ÁAugust 10, 2011. The three hospitals not reporting complete data for the study period were excluded. These records represent approximately 15% of all ED visits in the state for JuneÁAugust. Cases of heat-related illness were identifiedusing ICD9CM diagnostic and external cause of injury codes: 992, 705.1, 708.2 and E900. Additional cases were identified from the chief complaint field using the SAS INDEX function to locate the following words within the text field: 'HEAT', 'HEATED', 'DEHYDRATED' and 'HYPERTHERMIA'. Each record returned from these searches was examined to confirm the presence of heat illness. Chief complaint fields containing keywords but not involving heat-related illness, i.e., 'applied heat to swollen ankle', were eliminated. with heat-related ED vists were 55% male (n 0273) with a median age of 34 years. Further analyses will assess correlation between heat index and heat illness in Nebraska.