Charlson Comorbidity Index
Active senior with no significant comorbidities
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Evidence-based calculations Used in clinical settings worldwide Regular monitoring recommended
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Healthy Elderly (68M)
Active senior with no significant comorbidities
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Mild Comorbidities (72F)
Patient with controlled diabetes and hypertension
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Moderate Comorbidities (75M)
Post-MI patient with COPD and diabetic nephropathy
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Cancer Patient (70F)
Patient with treated breast cancer and CHF
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High Disease Burden (82M)
Multiple serious comorbidities including metastatic cancer
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Patient Information
Age adjustment: +1 point per decade over 40 (max +4)
1-Point Conditions
2-Point Conditions
3-Point Conditions
6-Point Conditions
For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.
🏥 Health Facts
— WHO
— CDC
What is the Charlson Comorbidity Index?
The Charlson Comorbidity Index (CCI) is a clinical scoring system developed by Dr. Mary Charlson in 1987 to predict long-term mortality by classifying and weighting comorbid conditions. It is one of the most widely used comorbidity indices in medical research and clinical practice.
The index assigns weighted scores to 17 categories of medical conditions based on their relative risk for mortality. An age adjustment can be added for patients 50 years and older. The CCI helps physicians assess whether a patient will benefit from certain treatments or screenings based on their overall health status.
Score 0
~98% 10-year survival
Score 1-2
~90% 10-year survival
Score 3-4
~53% 10-year survival
Score 5+
<21% 10-year survival
How to Calculate the CCI
- Identify Comorbidities: Review medical history for the 17 condition categories
- Assign Points: Each condition has a weighted score (1, 2, 3, or 6 points)
- Sum Comorbidity Points: Add all condition points for the raw CCI score
- Add Age Points: Add 1 point per decade over 40 (max 4 at 80+)
- Calculate Survival: Use the formula to estimate 10-year survival
Survival Formula
Y = e^(CCI × 0.9)
10-Year Survival = 0.983^Y
When to Use the CCI
Clinical Applications
- • Treatment decision-making
- • Cancer screening eligibility
- • Surgical risk assessment
- • Prognosis discussions
- • Research risk adjustment
- • Goals of care conversations
Key Questions CCI Helps Answer
- • Will patient benefit from aggressive treatment?
- • Should this patient undergo cancer screening?
- • What is expected life expectancy?
- • How should I counsel about prognosis?
CCI Scoring System
1-Point Conditions
- • Myocardial infarction
- • Congestive heart failure
- • Peripheral vascular disease
- • Cerebrovascular disease
- • Dementia
- • Chronic pulmonary disease
- • Rheumatologic disease
- • Peptic ulcer disease
- • Mild liver disease
- • Diabetes (uncomplicated)
Higher Point Conditions
2 Points:
Hemiplegia, CKD, DM with complications, Tumor, Leukemia, Lymphoma
3 Points:
Moderate/severe liver disease
6 Points:
Metastatic solid tumor, AIDS
Age Adjustment:
+1 per decade over 40 (max +4)
Clinical Applications & Decision Making
Treatment Decisions
- • Chemotherapy eligibility for cancer patients
- • Surgical risk assessment
- • Transplant candidacy evaluation
- • Intensity of treatment selection
- • Dialysis initiation discussions
- • Palliative vs curative intent decisions
Research Applications
- • Case-mix adjustment in outcomes studies
- • Risk stratification for clinical trials
- • Administrative data analysis
- • Healthcare resource utilization
- • Quality metrics development
- • Population health management
Score-Based Survival Estimates
| CCI Score (Age-Adjusted) | 10-Year Mortality | 5-Year Survival Estimate |
|---|---|---|
| 0 | ~12% | ~96% |
| 1-2 | ~26% | ~90% |
| 3-4 | ~52% | ~77% |
| 5-6 | ~85% | ~53% |
| ≥7 | >95% | <45% |
Comparison with Other Comorbidity Indices
| Feature | CCI | Elixhauser | CIRS |
|---|---|---|---|
| Number of Conditions | 17 | 31 | 13 systems |
| Weighting | 1,2,3,6 | Various | 0-4 severity |
| Age Adjustment | Available | No | No |
| Data Source | Chart review or ICD | ICD codes | Clinical interview |
| Best For | Mortality prediction | LOS, costs | Elderly, detailed |
Key References
- 1. Charlson ME, Pompei P, Ales KL, MacKenzie CR. A new method of classifying prognostic comorbidity in longitudinal studies: development and validation. J Chronic Dis. 1987;40(5):373-383.
- 2. Charlson M, Szatrowski TP, Peterson J, Gold J. Validation of a combined comorbidity index. J Clin Epidemiol. 1994;47(11):1245-1251.
- 3. Quan H, Li B, Couris CM, et al. Updating and validating the Charlson comorbidity index and score for risk adjustment in hospital discharge abstracts using data from 6 countries. Am J Epidemiol. 2011;173(6):676-682.
- 4. Sundararajan V, Henderson T, Quan H, et al. New ICD-10 version of the Charlson comorbidity index predicted in-hospital mortality. J Clin Epidemiol. 2004;57(12):1288-1294.
- 5. Deyo RA, Cherkin DC, Ciol MA. Adapting a clinical comorbidity index for use with ICD-9-CM administrative databases. J Clin Epidemiol. 1992;45(6):613-619.
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