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Table 2 ICD-10-CA code definitions and language describing the change in coding directive

From: Importance of ICD-10 coding directive change for acute gastroenteritis (unspecified) for rotavirus vaccine impact studies: illustration from a population-based cohort study from Ontario, Canada

ICD-10-CA Code Definition and notes in ICD-10-CA [26]
A08.0 Rotaviral enteritis
A08.3 Other viral gastroenteritis
A08.4 Viral intestinal infection, unspecified
Includes: viral enteritis not otherwise specified (NOS), viral gastroenteritis NOS, and viral gastroenteropathy NOS)
A08.5 Other specified intestinal infections
A09 Other gastroenteritis and colitis of infectious and unspecified origin Excludes: due to bacterial, protozoal, viral and other specified infectious agents (A00-A08) and noninfective (see noninfectious) diarrhoea (K52.9)
K52.9 Noninfective gastroenteritis and colitis, unspecified
Includes: diarrhea, enteritis, ileitis, jejunitis, and sigmoiditis if specified as noninfectious
Excludes: colitis, diarrhoea, enteritis, gastroenteritis if coded as infectious (A09.0) or of unspecified origin (A09.9); functional diarrhoea (K59.1); neonatal diarrhoea (noninfective) (P78.3); psychogenic diarrhoea (F45.3)
Description of coding directive as described within the 2009 Canadian Coding Standards [27]
Change Rationale
“Deleted the directive: “Assume gastroenteritis to be noninfectious unless documented as infectious by the responsible physician””
“Added an introductory sentence: “most cases of gastroenteritis are infectious, even in industrialized countries, thus ICD-10-CA version 2009 classifies gastroenteritis NOS as infectious (A09.9 Gastroenteritis and colitis of unspecified origin)””
“To align with the change for v2009 ICD-10-CA. The code K52.9 Noninfective gastroenteritis and colitis, unspecified is assigned when specified as noninfectious”