Table 2. Concordance Between Indications of Suicidal Ideation According to the Specified Source^* and Indications According to International Classification of Diseases, 9th Revision, Codes

	HPI (n = 15,761)	PHQ-9 (n = 1,013)	HPI or PHQ-9 (n = 16,289)	Both HPI and PHQ-9 (n = 485)
Suicidal ideation indicated by specified source	1,025 (6.5)	85 (8.4)	1,098 (6.7)	12 (2.5)
Corresponding ICD-9 code included	30 (3)	4 (5)	34 (3.1)	0 (0)
κ Statistic	0.036	0.068	0.04	—

Data are n (%).
↵* Source corresponds to the column headings: history of present illness [HPI] notes field; item 9 of the 9-item Patient Health Questionnaire [PHQ-9]; HPI notes field or PHQ-9 item 9; both the HPI notes field and PHQ-9 item 9.
ICD-9, International Classification of Diseases, 9th Revision.