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. 2019 Nov 29;7(4):e14325. doi: 10.2196/14325

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©Patrick Wu, Aliya Gifford, Xiangrui Meng, Xue Li, Harry Campbell, Tim Varley, Juan Zhao, Robert Carroll, Lisa Bastarache, Joshua C Denny, Evropi Theodoratou, Wei-Qi Wei. Originally published in JMIR Medical Informatics (http://medinform.jmir.org), 29.11.2019.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Medical Informatics, is properly cited. The complete bibliographic information, a link to the original publication on http://medinform.jmir.org/, as well as this copyright and license information must be included.

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Timeline of the two 18-month periods from which ICD-9-CM and ICD-10-CM codes from VUMC were analyzed. The cohort of 357,728 patients had at least one ICD-9-CM and one ICD-10-CM code in the respective 18-month windows. ICD-9-CM: International Classification of Diseases, Ninth Revision, Clinical Modification; ICD-10-CM: International Classification of Diseases, 10th Revision, Clinical Modification.