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External cause code 1 (ICD 9 CM)


Please see the User Note on Injuries and Poisonings to find the external cause coding scheme for each year.

IRECODE1 is a 5-digit-numeric variable.

99998: Not in Universe


For all injury and poisoning episodes that occurred within the past 3 months, IRECODE1 reports the first external cause code for the injury/poisoning episode. External cause codes are assigned by the NHIS using the ICD-9-CM external cause codes according to responses given about the cause of injury/poisoning (), affected body parts, how affected body parts were harmed, location at the time of the injury/poisoning episode, activity at the time of injury/poisoning episode, clarifying information on transportation or motor vehicle accidents, clarifying information on falls, and clarifying information on poisonings. The second and third external cause codes for each injury/poisoning episode are found in IRECODE2 and IRECODE3, respectively.

IRECODE1 is an injury-level variable.

IRECODE1 is part of a series of variables initiated in 1997 that systematically report persons' injuries and poisonings, the cause, what the person was doing while sustaining the injury or poisoning, and where she/he was at the time of the injury or poisoning. For related variables and additional information, please see the User Note on Injuries and Poisonings or use the IPUMS NHIS search function and drop-down menus.


Prior to 2000, persons were asked about injuries and poisonings separately; in 1997-1999 IRECODE1 refers only to injury episodes.


  • 1997-1999: All injuries.
  • 2000-2014: All injuries and poisioning episodes.


  • 1997-2014