 As part of the French diagnosis-related group DRG-based prospective payment system, computerized hospital discharge data include patient and hospital stay identifiers, admission and discharge dates, age, gender, length of stay, discharge location, primary and secondary ICD-10 discharge diagnosis codes up to 99 for both index hospitalization and readmission. ICD-10 coding complies with national guidelines and is done by trained technicians or physicians, depending on the hospital. Coders usually abstract diagnoses from physician notes, although admission notes, daily progress notes, consultation reports, diagnostic imaging, and treatments are routinely recorded in the medical chart. Discharge data are externally audited by reabstracting a random sample of hospital stays every year. 