Diagnosis. Looks for a diagnosis of measles. Search discharge diagnosis and admit reason code/combo for :
^B05[0-9]^,or,^B05.^

Narrow.  Identifies mentions of or diagnoses of measles, excluding visits mentioning titers or visits for vaccination. Searches chief complaint history, Discharge Diagnosis, Triage Notes Orig, Admit Reason Code, Admit Reason Combo, and Clinical Impression for:
^B05[0-9]^,or,^B05.^,or,^measle^,or,^m[ea][ae]s[le][el]^

AND CC and DD:
^,ANDNOT,(,^Z23^,or,^titer^,)

Medium. Looks for measles terms and synonyms or classic measles symptoms. Searches Chief Complaint History and Discharge Diagnosis for:
^rubella^,or,^rubeola^,or,^measle^,or,^m[ea][ae]s[le][el]^,or,^koplik spots^,or,^erythematos rash^,or,(,(,^fever^,or,^chills^,or,^rigor^,or,^shiver^,),AND,^rash^,),or,^B05[0-9]^,or,^B05.^,or,^B06[0-9]^,or,^B06.^

AND searches Discharge Diagnosis for:
^,ANDNOT,^Z23^

Broad. Looks for measles terms/diagnoses, symptoms, or fever + rash. Searches Chief Complaint History, Discharge Diagnosis, Triage Notes Orig, Clinical Impression, Admit Reason Code, Admit Reason Combo for: (,^rubella^,or,^rubeola^,or,^measle^,or,^m[ea][ae]s[le][el]^,or,^koplik spots^,or,^erythematos rash^,or,(,(,^fever^,or,^chills^,or,^rigor^,or,^shiver^,),AND,^rash^,),or,(,(,^B05[0-9]^,or,^B05.^,or,^B06[0-9]^,or,^B06.^,),),),andnot,(,^denies rash^,or,^denies fever^,or,^no fever^,or,^no rash^,or,^[a-z]rash^,or,^rash[a-z]^,or,^reaction^,or,^crash^,or,^arthritis^,or,^no known fever^,or,^no fever^,)

AND Discharge Diagnosis for:
^,ANDNOT,(,^B084^,or,^B01^,or,^Z23^,or,^B0682^,or,^B06.82^,)