Table 1.

Diagnosis search codes, terms, and chief complaint search terms used in an NSSP BioSense “heat, excessive” query and CSTE novel heat-related illness query to produce initial line lists of patients with heat-related illnesses, Maricopa County, Arizona, January 1 to December 31, 2015^a

Syndrome Query		Search Codes and Termsb
Developer	Name
NSSP, BioSense Platform	BioSense predefined “heat, excessive” query	Inclusion criteria: ICD-9-CM and ICD-10-CM diagnosis search codesc 992, E900, T67, and X30 Diagnosis text search terms: demasiado caliente, to hot, too hot, excessive + heat, heat apoplexy, heat collapse, heat cramps, heat edema, heat effects, heat exhaustion, heat fatigue, heat prostration, heat pyrexia, heat stroke, heat syncope, over + heated, sunstroke Chief complaint text search terms: demasiado caliente, to hot, too hot, enlosacion, heat, hypertermia, hyperthermia, insolacion, over + heated, overheated, sobre calentado, sobre caliente
CSTE Heat Syndrome Workgroup	Novel heat-related illness query	Inclusion criteria: ICD-9-CM and ICD-10-CM diagnosis search codesc 992, E900, T67, and X30 Chief complaint text search terms: heat_,d heatcramp, heatex, heatst, heat-exhaust, heat-related, heat-stroke, hypertherm, overheat, “over heat,” “sun stroke,” sunstr, sun-str, “to hot,” “too hot,” ([heet OR hot] AND [excessive OR exhaust OR expos OR fatigue OR cramp OR stress OR “in car” OR outside OR prostration]) Exclusion criteria: ICD-9-CM and ICD-10-CM diagnosis search codese 1992, 6992, E900.1, E9001, and T50.992A Chief complaint text search terms: allerg, “feeling hot,” “feels heat,” “feels hot,” “felt hot,” (hot AND sensation), “heat sensation,” inflam, (pain AND (limb OR arm OR shoulder OR elbow OR wrist OR hand OR leg OR hip OR groin OR thigh OR knee OR ankle OR foot OR feet), pain AND red, radiat, redness, swell, swollen, surg, “post op,” ibuprofen, ibuprophen, alieve, motrin, tylenol, injur, trauma, heat AND ice, heat AND (applied OR tried OR used OR using), “heat pack,” “heating pad,” (pain AND [back OR neck OR flank]), lumbargo, relief, resolve, relieve, releive, dental, heat AND cold, hot AND cold, oral AND surg, pain AND (jaw OR mouth OR teeth OR tooth), sensitiv AND (heat OR hot), hot AND coff, “hot dog,” “hot grease,” “hot peppers,” “hot tea,” “heat ache,” heatache, “heat attack,” “heat beat,” heatbeat, “heat burn” heatburn, “heat flutter,” “heat racing,” “heat rate,” heatrate, heatlh, heath, heatth, “hitting heat,” palpitation, cheat, heated, heater, Heather, heating, hotel, lithotr, methotr, photo, psychotic, sheath, sheet, shot, Sunday, theat, wheat, accident, alcohol, burn AND mouth, distress, fever, “gets hot,” “heat flash,” “hot flash,” heat AND rash, hives, hot AND shower, “hot tub,” “no heat,” oven, suicid

Abbreviations: CSTE, Council of State and Territorial Epidemiologists; ICD-9-CM, International Classification of Diseases, Ninth Revision, Clinical Modification; ICD-10-CM, International Classification of Diseases, Tenth Revision, Clinical Modification; NSSP, National Syndromic Surveillance Program.

^aTable based on Appendix 2 of the CSTE guidance document for implementing heat-related illness syndromic surveillance in public health practice.²⁴

^bMisspelled words included intentionally.

^cCodes to include: 992, effects of heat and light; E900, accident caused by excessive heat; T67, effects of heat and light; X30, exposure to excessive natural heat.

^dChief complaint search term “heat_” is equivalent to term “heat” immediately followed by a space.

^eCodes to exclude: 1992, multiple codes contain this combination of digits; 6992, multiple codes contain this combination of digits; E900.1/E9001, accidents due to excessive heat of manmade origin; T50.992A, poisoning by other drugs, medicaments, and biological substances, as well as intentional self-harm and initial encounter.