The Occupational Injury and Illness Classification System (OIICS), developed by the Bureau of Labor Statistics (BLS), is a hierarchical coding system that is used to characterize occupational injury and illness incidents. Coding schemes are included for: the Nature of the injury or illness; the Part of Body Affected by the injury or illness; the Source and Secondary Source of the injury or illness; and the Event or Exposure.

NIOSH has developed this web site and the accompanying downloadable software application as a resource for occupational safety and health researchers, policy makers, employers, and others who may need to use the OIICS for uniformly characterizing occupational injuries and illnesses or better understanding the national occupational injury and illness data released by the BLS and NIOSH (see About OIICS). To code or use the OIICS coded data one should properly understand the OIICS Coding Selection Rules.

This site provides a graphical tree interface for each of the four unique coding schemes. The coding trees are searchable and include descriptive details. The complete OIICS manual is viewable as a separate document. In addition, a standalone software version of the coding trees is available for download and installation on your own computer desktop.

	Nature:	the principal physical characteristic(s) of the injury or illness.
	Part of Body Affected:	the part of the body directly affected by the injury or illness.
	Source:	the object, substance, bodily motion, or exposure which directly produced or inflicted the injury or illness.
	Secondary Source:	the object, substance, or person that generated the source of injury or illness or that contributed to the event or exposure.
	Event or Exposure:	the manner in which the injury or illness was produced or inflicted.

Coding Selection Rules

 

Injury @ Work

Coding Resources