. 2021 Mar 18;2(3):156–163. doi: 10.1016/j.cvdhj.2021.03.003

Table 3.

Application of validated natural language processing algorithm vs administrative diagnosis codes to identify aortic stenosis among all adult echocardiograms, 2008–2018

		Validated NLP algorithm		Total echocardiograms, n (column %)
		Positive for AS	Negative for AS	Total echocardiograms, n (column %)
AS ICD 9/10 codes^†	Positive for AS	67,297	34,514	101,811 (11.0)
AS ICD 9/10 codes^†	Negative for AS	36,793	789,280	826,073 (89.0)
	Total echocardiograms, n (row %)	104,090 (11.2)	823,794 (88.8)	927,884

AS = aortic stenosis.

^†

ICD-9 codes included 395.0, 746.3, 396.2, and 424.1; ICD-10 codes included I06.0, I06.2, I35.0, and Q23.0.