Validation of International Classification of Diseases Tenth Revision code for prurigo nodularis

Abstract

To the Editor: Prurigo nodularis (PN) is a chronic inflammatory skin condition characterized by intensely pruritic, hyperkeratotic nodules.1,2 PN dramatically reduces quality of life, but it remains greatly understudied.3,4 The lack of validation of the International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code for PN has limited population-based investigations of PN, despite availability of large, real-world, claims-based databases. Here, the validity of the ICD-10-CM code for PN was assessed.