Self‐Reported Awareness and Use of International Classification of Disease Coding of Inflammatory Bowel Disease Services by Ontario Physicians

RATIONALE: Population and health services research can be performed by linkage analysis of administrative data. However, the robustness of study results is determined by the accuracy of the diagnostic coding. OBJECTIVES: To estimate the awareness, use and accuracy of the International Classification of Diseases, Ninth Revision (ICD-9) coding by physicians providing services for patients with Crohn's disease (CD) and ulcerative colitis (UC).