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Comment & Response
February 2017

Errors in ICD-9 Codes and Percentages Reported in Tables

Author Affiliations
  • 1Division of Cardiology, Weill Cornell Medical College, New York Presbyterian Hospital, New York
JAMA Cardiol. 2017;2(2):230. doi:10.1001/jamacardio.2016.5225

To the Editor On behalf of our coauthors, we write to report errors and the need for corrections to our article “Hospital Volume Outcomes After Septal Myectomy and Alcohol Septal Ablation for Treatment of Obstructive Hypertrophic Cardiomyopathy: US Nationwide Inpatient Database, 2003-2011,” published in the June 2016 issue of JAMA Cardiology.1 As we previously reported,2 there was a typographical error in the original article regarding the International Classification of Diseases, Ninth Revision codes. We used International Classification of Diseases, Ninth Revision procedure codes 37.33 (excision of heart tissue) and 37.34 (ablation of heart tissue) to identify patients undergoing septal myectomy and American Society of Anesthesiologists score, respectively. The errors affected data reported on uncomplicated diabetes, Medicare payer, medium hospital size, concomitant coronary artery bypass graft (CABG), and concomitant valve surgery in Table 1 and for anemia in Table 2.1 For concomitant CABG and concomitant valve surgery characteristics, we previously listed a number of CABG (or valve) operations within each tertile divided by a number of total CABG (or valve) operations rather than percentages. The corrected percentages (number of CABG or valve operations) within each tertile divided by a number of total septal myectomy cases in each tertile now appear in the corrected article.3

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