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In the Original Investigation by Kim et al titled 鈥淗ospital Volume Outcomes After Septal Myectomy and Alcohol Septal Ablation for Treatment of Obstructive Hypertrophic Cardiomyopathy: US Nationwide Inpatient Database, 2003-2011,鈥� published online April 27, 2016, and also in the June 2016 print issue of JAMA Cardiology,¹ the incorrect International Classification of Diseases, Ninth Revision codes were used for septal myectomy (36.33) and septal ablation (36.34). The following codes should have been used: 37.33 (excision of heart tissue) and 37.34 (ablation of heart tissue).

These errors affected some of the percentages reported in Table 1 and Table 2. In Table 1, the correct numbers and percentages should have been as follows: 509 (10.7%) for uncomplicated diabetes in the third tertile; 178 (31.1%), 262 (24.8%), and 857 (18.0%) for concomitant coronary artery bypass graft in the first, second, and third tertiles, respectively; 289 (50.5%), 611 (57.9%), and 2280 (47.9%) for concomitant valve surgery in the first, second, and third tertiles, respectively; 528 (50.0%) and 1918 (40.3%) for Medicare in the second and third tertiles, respectively; and 504 (10.6%) for medium hospital bed size in the third tertile. In Table 2, the correct number and percentage was 64 (10.4%) for anemia in the second tertile. This information has been updated.² This article was corrected online.