Charlson Comorbidity Index

From CCMDB Wiki
Jump to navigationJump to search

The Charlson Comorbidity Index is a method of classifying prognostic comorbidity in longitudinal studies.

Some Comorbid Diagnosis have points associated with them that contribute to an overall comorbidity score. This score reflects the cumulative increased likelihood of one year mortality.


Contains 19 primary medical conditions of comorbidity some of which contain subcategories of diseases related to the primary category. For a list of all diagnosis applicable that we use go to: Charlson Comorbid Diagnosis (or Charlson Comorbid coding (pre ICD10)#Comorbid_List as former may not include all sub-diagnoses).



Collection Start Date

September 14, 1998

Data Use


Is that the Annual report?

  • SMW

  • Cargo

  • Categories
  • the dxs involved were also used in Overstay


The Charlson Index was developed in 1987 based on 1-year mortality data from internal medicine patients admitted to a single New York Hospital and was initially validated within a cohort of breast cancer patients. The index encompasses 19 medical conditions weighted 1–6 with total scores ranging from 0–37. In the development phase of the index, mortality for each disease was converted to a relative risk of death within 12 months. A weight was then assigned to each condition based on the relative risk (RR); for example,

  • RR <1.2 = weight 0,
  • RR ≥ 1.2<1.5 = weight 1,
  • RR ≥ 1.5<2.5 = weight 2,
  • RR ≥ 2.5<3.5 = weight 3,
  • and for 2 conditions (metastatic solid tumor and AIDS) = weight 6.

From the weighted conditions, a sum score can be tallied to yield the total comorbidity score.

Article and related publications

  • "A new method of classifying prognostic comorbidity in longitudinal studies: development and validation" ME Charlson


See Category:Charlson Comorbid Diagnosis (pre ICD10) for how Charlson was calculated before ICD10.