Journal
CONTACT DERMATITIS
Volume -, Issue -, Pages -Publisher
WILEY
DOI: 10.1111/cod.14456
Keywords
epidemiology; general population; hand dermatitis; hand eczema; lifestyle; medication; treatment; validation
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In this study, several ICD-10 codes for hand eczema (HE) were validated and important characteristics of HE patients were identified, including demographic features, disease characteristics, and medication use.
Background: The international classification of diseases, 10th revision (ICD-10) includes several unvalidated diagnostic codes for hand eczema (HE). Knowledge is sparse on HE patient characteristics.Objectives: To validate selected HE ICD-10 codes in the Danish National Patient Registry (DNPR) and describe disease characteristics, lifestyle factors and medication use in adult HE patients.Methods: Nineteen HE ICD-10 codes were selected and validated based on patient charts. Five cohorts were constructed based on the diagnostic code, DL30.8H (HE unspecified), in the DNPR: (i) patients with DL30.8H code (n = 8386), (ii) patients with DL30.8H code, but without atopic dermatitis (AD) (n = 7406), (iii) sex- and age-matched general population (n = 8386) without HE. Two additional cohorts nested in the DNPR included participants from the Danish Skin Cohort, (iv) patients with DL30.8H code but without AD (n = 1340) and (v) general population cohort (n = 9876).Results: ICD-10 codes revealed positive predictive values >= 90% except irritant contact dermatitis (unspecified) (79.7%) and hyperkeratotic hand and foot eczema (84.1%). HE patients were most often women, middle-aged or older, of Danish ethnicity, had an atopic medical history and were smokers. Topical corticosteroid prescriptions were almost doubled in HE cohorts compared to general populations.Conclusion: We validated several HE ICD-10 codes and identified important HE patient characteristics.
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