Positive predictive value of ICD-9-CM codes to detect acute exacerbation of COPD in the emergency department

Ginde A.A.CHU-LIN TSAIBlanc P.G.Camargo Jr. C.A.2020-03-232020-03-2320081553-7250https://scholars.lib.ntu.edu.tw/handle/123456789/478126Positive predictive value of ICD-9-CM codes to detect acute exacerbation of COPD in the emergency departmentjournal article10.1016/S1553-7250(08)34086-0190250892-s2.0-56049118242