Danish National Patient Registry (Landspatientregisteret)

The Danish National Patient Registry contains comprehensive data on all hospital admissions, diagnoses coded in ICD-10, procedures coded in NOMESCO, and treatments in Denmark since 1977, covering both psychiatric and non-psychiatric inpatient care as well as emergency and outpatient specialty visits since 1995. Access for research is granted through application to the Danish Health Data Authority, which manages the registry as part of a broader health data system covering operations, diagnoses, births, causes of death, and medicines.