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. 2017 Jun 29;12:1891–1902. doi: 10.2147/COPD.S136768

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© 2017 Lau et al. This work is published and licensed by Dove Medical Press Limited

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Flowchart of data exclusions used to create the Readmission After COPD Exacerbation risk Scale.

Note: *International Classification of Diseases (ICD)-9 codes for COPD: 491, 491.0, 191.1, 491.2, 491.20, 491.21, 491.22, 491.8, 491.9, 492, 492.0, 492.8, 496.