Term: Elixhauser Comorbidity Index

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Glossary Definition

Last Updated: 2009-10-22


A measurement tool that defines 30 comorbid (i.e., co-existing) conditions using ICD-9-CM codes. This instrument is meant to be used with large administrative data sets (Elixhauser et al., 1998). The index has been updated for use with ICD-10 coding (Quan et al., 2005).

The link below to ICD-9-CM and ICD-10 Coding Algorithms for Elixhauser Comorbidities provides a table identifying the ICD-9-CM and ICD-10 codes used by Quan et al. (2005).

For more information on the Elixhauser Comorbidity Index, please read the corresponding sections of the Complications and Comorbidities concept.

Related concepts 

Related terms 



  • Elixhauser A, Steiner C, Harris DR, Coffey RM. Comorbidity measures for use with administrative data. Med Care 1998;36:8-27. [Abstract] (View)
  • Quan H, Sundararajan V, Halfon P, Fong A, Burnand B, Luthi JC, Saunders LD, Beck CA, Feasby TE, Ghali WA. Coding algorithms for defining comorbidities in ICD-9-CM and ICD-10 administrative data. Med Care 2005;43(11):1130-1139. [Abstract] (View)

Term used in 

  • Garland A, Fransoo R, Olafson K, Ramsey C, Yogendran M, Chateau D, McGowan K. The Epidemiology and Outcomes of Critical Illness in Manitoba. Winnipeg, MB: Manitoba Centre for Health Policy, 2012. [Full Report] [Summary] (View)

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