Table 1.

Criteria for hypertension definitions in administrative and EMR data

Definition	Data source	Criteria	Codes	Validity
Administrative18	Physician claims	At least two billing claims within 2 years	ICD9 codes: 401–405	Sensitivity: 75% Specificity: 94% PPV: 81% NPV: 92%
	Discharge Abstract Database	One in-patient diagnosis code at any time	ICD10 codes: I10-I15
EMR/CPCSSN19	Physician claims table	At least two billing claims within 2 years	ICD9 codes: 401–405	Sensitivity: 84.9% Specificity: 93.5 PPV: 92.9% NPV: 86.0%
	Problem list/profile table	At least one diagnosis code at any time	ICD9 codes: 401–405
	Prescribed medication table	Any occurrence of a specified hypertension medication, except if one of the following co-morbid conditions exists: diabetes mellitus (250), tremor (333.1), migraine (346), myocardial infarction (410, 412), angina or cardiac dysrhythmias (413, 427), heart failure (428), oesophageal varices (456.0, 456.1), calculus of kidney and ureter (592), portal hypertension (572.3)	ATC codes: C02, C03AA03, C03BA04, C03BA08, C03BA11, C03DB01, C03DB02, C03EA01, C07AA06, C07AB03, C07AB04, C07AG02, C07CB03, C08CA01, C08CA02, C08DA01, C09AA01, C09AA02, C09AA03, C09AA07, C09AA08, C09AA09, C09AA10, C09BA02, C09BA03, C09CA02, C09CA03, C09CA04, C09CA07, C09DA01, C09DA02, C09DA04, C09XA02

ATC, Anatomical Therapeutic Chemical (classification); CPCSSN, Canadian Primary Care Sentinel Surveillance Network; EMR, electronic medical record; ICD, International Classification of Diseases; NPV, negative predictive value; PPV, positive predictive value.