Occupational Injury and Illness Classification Manual
The Occupational Injury and Illness Classification System (OIICS) Manual provides the classification
system used to code the case characteristics of injuries, illnesses, and fatal injuries in the Survey of
Occupational Injuries and Illnesses (SOII) and the Census of Fatal Occupational Injuries (CFOI).
This manual contains the rules of selection, code descriptions, code titles, and indices, for the
following code structures: Nature of Injury or Illness, Part of Body Affected, Source of Injury or
Illness, Event or Exposure, and Secondary Source of Injury or Illness.
The OIICS was originally developed and released in 1992. Clarifications and corrections were incorporated
into the manual in 2007. These were used to code data for years up to and including 2010
Because of the minor changes involved in the 2007 revision, that version of the OIICS Manual may be used as
a reference source for SOII and CFOI data for 1992-2010.
The coding structure underwent a comprehensive revision in 2010. A list of major changes that were implemented in that revision
(OIICS 2.0) is available (PDF 53K). A minor update (OIICS 2.01),
incorporating some corrections and clarifications, was released in January 2012. BLS will adopt OIICS 2.01 beginning with CFOI and SOII data for 2011.
Case characteristic data for 2011 are, therefore, a break in series with data for prior years.
Occupational Injury and Illness Classification System, Version 2.01
The links in the table of contents below are to PDF files, each of which contains a section of the manual.
If you prefer, you may download the manual in its entirety in two ways:
1) The entire text as a single PDF file (PDF
2 ) A ZIP file that includes a PDF of each separate section shown below (Download
ZIPPED PDFs 7.8 MB)
In addition, a ZIP file containing an Excel spreadsheet of codes and titles is available (Download
ZIPPED XLSX 147 KB)
Instructions regarding the use of ZIP files are available: How to View ZIP Files
Section and Title
A list of changes in OIICS 2.01 can be found here (PDF
Last Modified Date: March 6, 2012