Appendix 2.
Diagnosis coding for study outcomes
| Outcome | Database | Definition |
|---|---|---|
| Myocardial infarction | CIHI-DAD NACRS | Admission to hospital or the emergency room with a most responsible diagnosis of acute myocardial infarction, as coded by ICD9 410; ICD10 I21, I22 |
| Stroke | CIHI-DAD NACRS | Admission to hospital or the emergency room with a most responsible diagnosis of stroke, as coded by ICD9 431, 434, 436; ICD10 I61, I63, I64, G46 |
| Heart failure | CIHI-DAD | Admission to hospital with a most responsible diagnosis of heart failure, systemic volume overload, or pulmonary oedema, as coded by ICD9 276.6, 425, 428, 514, 518.4; ICD10 E87.7, I09.9, I11.0, I13, I25.5, I42, I43, I50, J81 |
| Dialysis | CIHI-DAD CIHI-SDS NACRS OHIP | In-hospital or in-community performance of peritoneal dialysis, haemodialysis, or ultrafiltration (including continuous dialysis) as coded by CCP 51.95, 66.98; CCI 1PZ21; OHIP G082 G083, G085, G090, G091, G092, G093, G094, G095, G096, G294, G295, G325, G326, G330, G331, G332, G333, G860, G861, G862, G863, G864, G865, G866, H540, H740, R849 |
| Acute renal failure | CIHI-DAD | Admission to hospital with a most responsible diagnosis of acute renal failure, pre-renal azotaemia, or anuria, as coded by ICD9 584; ICD10 N17, R39.2 |
| Malignant hypertension | CIHI-DAD | Admission to hospital with a most responsible diagnosis of malignant hypertension or hypertensive encephalopathy, as coded by ICD9 401.0, 402.0, 403.0, 404.0, 405.0, 437.2; ICD10 I10.1, I15.01, I15.11, I15.21, I15.81, I15.91, I67.4 |
| Renal hospitalization | CIHI-DAD | Admission to hospital with a most responsible renal diagnosis, as coded by ICD9 276.2, 276.6, 276.7, 403, 404, 580–589, 593.9, 788.5, 782.3, 791.0, 791.7, V42.0, V45.1, V56.0, V56.8; ICD10 E10.2x, E11.2x, E13.2x, E14.2x, I12, I13, I15.10, I15.11, M10.3, N00-08, N10-12, N14.1, N14.2, N16.5, N17-19, N25.0, N25.8, N25.9, N26, N27, N28.9, N29.8, R34, R39.2, R80, T86.1, T86.100, T86.101, T86102, Z94.0 |
| Revascularization | CIHI-DAD CIHI-SDS NACRS OHIP | In-hospital or in-community performance of any arterial revascularization procedure, as coded by CCP 48.1, 48.11–48.19, 48.02, 48.03, 48.09, 48.2, 48.3, 50.1, 50.11–50.19, 51.28, 51.25, 51.29, 51.26, 51.22, 51.24, 50.28, 50.38; CCI 1ID76MU, 1IJ26, 1IJ27, 1IJ50, 1IJ54, 1IJ57, 1IJ76, 1IJ80, 1IL35, 1JE50, 1JE57, 1JE87, 1JM58, 1JW35, 1JW50, 1JW57, 1JW76, 1JX50, 1JX57, 1JX76, 1KA50, 1KA57, 1KA76, 1KE26, 1KE35, 1KE50, 1KE57, 1KE76, 1KG26, 1KG35, 1KG50, 1KG57, 1KG76MI, 1KG87, 1KR38; OHIP E645, E645C, E645B, E646, E649, E651, E652, E654, E672, E679, G262, G298, J025, J050, J058, J066, N220, N223, R741, R742, R743, R780, R783, R784, R785, R787, R791, R792, R794, R797, R804, R806, R809, R814, R815, R830, R831, R832, R855, R856, R860, R861, R867, R933, R934, R936, R937, S421, Z434 |
CCI, Canadian Classification of Health Interventions; CCP, Canadian Classification of Diagnostic, Therapeutic and Surgical Procedures; CIHI-DAD, Canadian Institute for Health Information Discharge Abstract Database; CIHI-SDS, Canadian Institute for Health Information Same Day Surgery Database; ICD9, International Classification of Diseases, Ninth Revision; ICD10, International Statistical Classification of Diseases and Related Health Problems, Tenth Revision (Canadian enhancement); NACRS, National Ambulatory Care Reporting System; OHIP, Ontario Health Insurance Plan.