Skip to content Skip to navigation
National Cancer Data Base - Data Dictionary PUF 2016

Charlson/Deyo Score

PUF Data Item Name: 
Diagnosis Years Available: 
Allowable values: 
0 - 3
Comorbid conditions as described by Charlson/Deyo (1992) [1] are mapped from as many as ten reported ICD-9-CM or ICD-10 secondary diagnosis codes. The Charlson/Deyo value is a weighted score derived from the sum of the scores for each of the comorbid conditions listed in the Charlson Comorbidity Score Mapping Table (source: ). The range for this value is between 0 and 25. Starting with the 2015 PUF released in the Fall of 2017, ICD-10 codes are incorporated into the score calculation for cases diagnosed in 2006-2015. Registries were able to submit ICD-10 codes starting in 2006. However, very few ICD-10 codes were submitted until 2015. The 2015 Charlson-Deyo Score is derived from the highest score that is calculated from using either the ICD-9 codes or the ICD-10 codes. The allowable values have also been extended to now include values up to 3 or more.</p>
Analytic Note: 

Because of the small proportion of cases with a Charlson Comorbidity score exceeding 3, the data have been truncated to 0, 1, 2, 3 (greater than or equal to 3). A score of 0 indicates "no comorbid conditions recorded", or none of the values shown below. Patients with a score of 0 could still have comorbidities if they are conditions that are not included in the mapping table below. Note that the patient's cancer is not directly reflected in the recorded score.

Two examples illustrating how the Charlson Score is summarized for the PUF data: If a patient had a myocardial infarction, diabetes, and renal disease, the cumulative score would be 4, and the value shown in the PUF would be 3. If a patient had severe liver disease, the value in the PUF would also be 3, since the Charlson Score of severe liver disease is 3.

Values reported in the PUF:

Code Definition
0 Total Charlson Deyo Score of 0
1 Total Charlson-Deyo score of 1
2 Total Charlson-Deyo Score of 2
3 Total Charlson –Deyo Score of 3 or more

Charlson Comorbidity Score Mapping Table:

Condition Charlson Score*
Myocardial Infarction 1
Congestive Heart Failure 1
Peripheral Vascular Disease 1
Cerebrovascular Disease 1
Dementia 1
Chronic Pulmonary Disease 1
Rheumatologic Disease 1
Peptic Ulcer Disease 1
Mild Liver Disease 1
Diabetes 1
Diabetes with Chronic Complications 2
Hemiplegia or Paraplegia 2
Renal Disease 2
Moderate or Severe Liver Disease 3

*Individual Charlson scores are not provided in the PUF. Instead, the Charlson scores are summed for each patient and categorized by a value of 0, 1, 2 and 3 or more. A zero score means they had none of the conditions in the mapping table. They could have had other comorbid conditions however.

1 Source: Deyo RA, Cherkin DC, Ciol MA. Adapting a clinical comorbidity index for use with ICD-9-CM administrative databases. Journal of Clinical Epidemiology 1992;45(6):613-619.

More information about the Charlson-Deyo Comorbidity Index may be found on the University of Manitoba's website: