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Table 1 Sources and codes for identification of the chronically ill patients

From: Chronic-disease patients and their use of out-of-hours primary health care: a cross-sectional study

 

National registries in Denmark

Variables

Heart diseases

Danish National Registry of Patients

ICD-10 codes: I20, I21

Lung diseases

Danish National Registry of Patients

ICD-10 codes: J40-47, J96

National Health Insurance Service Registry

Service codes: 7113, 7121 (spirometries)

Danish National Prescription Registry

ATC codes: R03AC, R03AK, R03BA, R03BB, R03CC, R03DA, R03DC, V03AN01 (oxygen)

Diabetes

National Diabetes Registry

Civil registration number (CPR) and corresponding registry data

Psychiatric diseases

Danish Psychiatric Central Registry

ICD-10 codes: F20, F25, F30, F31

Cancer

Danish Cancer Registry

ICD-10 codes: C00-C97 (excl. C44)