Surveillance of ischemic heart disease should include physician billing claims: population-based evidence from administrative health data across seven Canadian provinces

Table 1 Ischemic heart disease (IHD) case definitions, ICD codes and procedure codes

CASE DEFINITIONS TESTED
1. One hospital discharge abstract with an IHD diagnostic code or procedure code in any field
2. One hospital discharge abstract with an IHD diagnostic code or procedure code in any field OR at least two physician claims within a one-year period
3. One hospital discharge abstract with an IHD diagnostic code or procedure code in any field OR at least three physician claims within a one-year period
ICD codes used to identify occurrences of IHD
	ICD-9 or ICD-9-CM	ICD-10-CA
IHD	410-414	I20-I25
Health related procedure codes used to identify occurrences of IHD in the hospital discharge abstract database
	CCP	ICD-9-CM	CCI
PCI	48.02	36.01	1.IJ.50
	48.03	36.02	1.IJ.57.GQ
		36.05	1.IJ.54
CABG	48.11-48.19	36.10-36.19	1.IJ.76

ICD-9: International Classification of Diseases, Ninth Revision.
ICD-9-CM: Clinical Modification of the Ninth Revision of the International Classification of Diseases.
ICD-10-CA: International Statistical Classification of Diseases and Related Health Problems – Tenth Revision, Canada.
PCI: Percutaneous Coronary Intervention.
CABG: Coronary Artery Bypass Graft.
CCP: Canadian Classification of Diagnostic, Therapeutic and Surgical Procedures (companion classification to ICD-9-CM).
CCI: Canadian Classification of Health Interventions (companion classification to ICD-10-CA).

ISSN: 1471-2261