Coding and Classification Errors in Study of Psilocybin Services

The authors of the Original Investigation, “Safety and Mental Health Outcomes of Oregon State-Regulated Psilocybin Services,”¹ published on August 19, 2026, in JAMA Network Open, have reported errors in the published article, including a coding error that misclassified reasons for seeking services and a small number of participants with miscategorized “other” race and 2 fewer participants with lifetime use of psilocybin than originally reported. The authors have explained what happened and the corrections needed to the text of the article, Tables, and Supplement in a Comment posted with the article.² The article has been corrected.¹