Table 1. International Classification of Diseases (ICD) codes for gastroenteritis of unknown etiology.

ICD revision and code	Title
ICD-9
Valid for cause of death coding
009.0	Infectious colitis, enteritis, and gastroenteritis
009.2	Infectious diarrhea
558a	Other noninfectious gastroenteritis and colitis
Invalid for cause-of-death coding
009.1b	Colitis, enteritis, and gastroenteritis of presumed infectious origin
009.3b	Diarrhea of presumed infectious origin
ICD-9-CM
009.0	Infectious colitis, enteritis, and gastroenteritis
009.1	Colitis, enteritis, and gastroenteritis of presumed infectious origin
009.2	Infectious diarrhea
009.3	Diarrhea of presumed infectious origin
558.9c	Other and unspecified noninfectious gastroenteritis and colitis
787.91d	Other symptoms involving digestive system: diarrhea
ICD-10
A09	Diarrhea and gastroenteritis of infectious origine
K52.9	Noninfective gastroenteritis and colitis, unspecified
P78.3	Noninfective neonatal diarrhea

^aIncludes radiation, toxic, and allergic gastroenteritis.
^bCoded as 558 on the 1979–1998 Multiple Cause of Death files.
^cIncluded allergic gastroenteritis before 2000.
^dCode introduced in 1995.
^eIncludes conditions that are presumed to be infectious.