Data
The National Health Insurance Service (NHIS) is a mandatory health
insurance system in Korea and their database includes 97% of the Korean
population. The NHIS database includes medical diagnoses, treatments,
drug information, hospital information, and demographic information.
Medical diagnoses are indicated using International Statistical
Classification of Diseases and Related Health Problems, 10th revision
(ICD-10) codes. For this study, we requested a customized dataset of
children who were diagnosed with cancer (C00-C99) and their parents’
income data from 2002 to 2015 from the Korean National Health Insurance
Claims Database.