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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)