Abstract
Pyoderma gangrenosum (PG) is a rare inflammatory and ulcerative neutrophilic dermatosis with an estimated incidence of 3-10 cases per million people annually.1Given that our understanding of PG is limited by disease rarity and considerable misdiagnosis rates (~30-50%),2 establishing a method to identify cases in large databases would facilitate population-based research. This approach has been used in other dermatologic diseases,3–6 where case identification is performed by diagnosis-related queries based on the International Classification of Diseases (ICD) code.
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