How is the Charlson Co-morbidity Score defined?

The Charlson Co-morbidity Score is calculated using HES/PEDW. A co-morbidity is defined as any hospital admission with one of the following diagnoses in the last year, including the current admission:

• congestive cardiac failure
• peripheral vascular disease
• cerebrovascular disease
• dementia
• rheumatological disease
• liver disease, diabetes
• hemiplegia/paraplegia

or any of the following diagnoses at a previous hospital admission in the last year:

• myocardial infarction
• chronic pulmonary disease
• chronic renal disease.