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Table 2 Average number of diagnosis and procedure codes per physician and ICD* precision, 3-month period, January-March 2011

From: Mining rich health data from Canadian physician claims: features and face validity

Specialty ICD diagnosis codes* Procedure codes Claims with ICD 4th or 5th digit
  Mean Median IQR Mean Median IQR Number %
Overall 82 60 21-134 21 16 3 -29 3,239,628 43.5%
Family medicine 121 122 70-171 20 17 10-27 1,907,011 40.0%
Internal medicine 32 25 16-43 15 14 9-20 326,583 55.2%
Neurology 27 24 16-34 10 10 7-12 25,224 53.5%
Obstetrics and Gynecology 37 37 20-52 40 44 26-55 114,016 58.2%
Pediatrics 46 37 15-73 12 11 7-16 121,377 58.4%
Psychiatry 10 10 6-13 10 10 6-15 147,100 37.7%
Radiology 12 8 5-14 12 8 5-15 20,994 57.5%
Surgery 36 33 23-46 44 46 32-59 199,631 57.6%
Others 76 55 20-134 29 30 15-41 377,692 44.3%
  1. *ICD: International Classification of Disease, precision increases with number of digits including up to 5 digits. Claims with ICD 4th to 5th digit is optional for claims submission.
  2. Inter-quartile range.