Abstract
To the Editor: Many researchers have conducted studies about atopic dermatitis, using health insurance data.1 Although atopic dermatitis diagnostic codes are usually used to select patients with the disease from the health insurance data, they may be inaccurate. In the Korean National Health Insurance system, certain treatments must have an atopic dermatitis code, allowing the treatment covered by the insurance. Therefore, to use the data in this database, a validation must be conducted to exclude patients with just atopic dermatitis codes who are not validated atopic dermatitis patients.
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