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

BMC Research Notes

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

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%

*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.
^†Inter-quartile range.

ISSN: 1756-0500