Charlson Comorbidity Index Calculator

The Charlson Comorbidity Index, or CCI, is a weighted method for summarizing a person's burden of serious chronic disease. It was originally developed to predict one-year mortality in hospitalized patients and was later adapted for many research and risk-adjustment settings. Conditions receive different weights based on their association with mortality in the original cohort. Adding those weights produces the comorbidity score, while a common age-adjusted version adds one point for each decade beginning at age 50, through a maximum of four age points. One-point conditions include myocardial infarction, congestive heart failure, peripheral vascular disease, cerebrovascular disease, dementia, chronic pulmonary disease, connective tissue disease, peptic ulcer disease, mild liver disease, and diabetes without chronic complications. Two-point categories include hemiplegia, moderate or severe kidney disease, diabetes with end-organ damage, localized solid tumor, leukemia, and lymphoma. Moderate or severe liver disease receives three points. Metastatic solid tumor and AIDS each receive six points. Categories can overlap conceptually, so careful coding matters. The milder and more severe stage of the same disease should generally not both be counted. For example, diabetes with end-organ damage supersedes uncomplicated diabetes, metastatic cancer supersedes a localized solid tumor, and moderate or severe liver disease supersedes mild liver disease. This interface displays all recognized weights but relies on the user to select clinically appropriate, nonduplicative categories. Definitions also vary among chart-review, diagnosis-code, and study-specific implementations. The optional survival figure uses a historical equation often presented with the index. It should be interpreted cautiously because treatment, case mix, and life expectancy have changed since the original studies. CCI performance depends on the population and outcome being studied. It is useful for cohort description, adjustment, prognosis discussion, and planning, but it does not include functional status, frailty, acute illness severity, laboratory values, treatment response, or patient goals. Only documented diagnoses should be entered. A high score does not determine whether a treatment is appropriate, and a low score does not guarantee recovery or long survival. Clinicians should apply the version validated for their setting and avoid comparing results calculated from different definitions. This educational tool is not a substitute for a full medical assessment. Prognostic information should be discussed sensitively with the patient and care team, using current evidence relevant to the actual disease and treatment context.