Table 3.

Percentage of adults ⩾18 years of age who submitted a stool sample, by selected ICD-9-CM diagnosis codes, Marshfield Clinic, Wisconsin, 1 January 2004–31 December 2014

ICD-9-CM diagnosis codesa	Stool sample submitted
	N	%
Intestinal infectious disease	1554/1681	92
Nonspecific gastroenteritis	4250/6181	69
Other symptoms involving digestive system: Diarrhoea (787.91)	2787/3855	72
Other and unspecified noninfectious gastroenteritis and colitis (558.9)	840/1372	61
Intestinal infection due to other organism, not elsewhere classified (008.8)	604/937	64
Ill-defined infectious gastroenteritis (009)b	132/151	87
Total (intestinal infectious disease and nonspecific gastroenteritis)	5804/7862	74

^aIntestinal infectious diseases: ICD-9-CM diagnosis codes 001-008.6; Nonspecific gastroenteritis code: ICD-9-CM diagnosis codes 008.8, intestinal infection due to other organism, not elsewhere classified, 009, ill-defined infectious gastroenteritis, 558.9, other and unspecified noninfectious gastroenteritis and colitis; and 787.91, other symptoms involving digestive system: diarrhoea; patients may have been assigned>1 diagnosis code for inflectional intestinal disease or nonspecific gastroenteritis.

^bPercentage of patients submitting a stool sample in subcategories of ill-defined infectious gastroenteritis ICD-9-CM 009): Infectious colitis, enteritis, and gastroenteritis (009.0) (89%); Colitis, enteritis & gastroenteritis of presumed infectious origin (009.1) (79%); Infectious diarrhoea (009.2) (87%); Diarrhoea of presumed infectious origin (009.3) (100%).