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Validity of ICD9-CM codes to diagnose chronic obstructive pulmonary disease from National Health Insurance claim data in Taiwan

Authors Ho TW, Ruan SY, Huang CT, Tsai YJ, Lai F, Yu CJ

Received 15 May 2018

Accepted for publication 30 August 2018

Published 2 October 2018 Volume 2018:13 Pages 3055—3063

DOI https://doi.org/10.2147/COPD.S174265

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Colin Mak

Peer reviewer comments 3

Editor who approved publication: Prof. Dr. Chunxue Bai


Te-Wei Ho,1,2 Sheng-Yuan Ruan,3 Chun-Ta Huang,3,4 Yi-Ju Tsai,5 Feipei Lai,1 Chong-Jen Yu3

1Graduate Institute of Biomedical Electronics and Bioinformatics, College of Electrical Engineering and Computer Science, National Taiwan University, Taipei, Taiwan; 2Department of Surgery, College of Medicine, National Taiwan University, Taipei, Taiwan; 3Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan; 4Graduate Institute of Clinical Medicine, National Taiwan University, Taipei, Taiwan; 5Graduate Institute of Biomedical and Pharmaceutical Science, College of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan

Purpose: Claim data from Taiwan’s National Health Insurance (NHI) database have previously been utilized in the study of COPD. However, there are limited data on the positive predictive value of claim data for COPD diagnosis. Therefore, this study aimed to characterize and validate the COPD cohort identified from the NHI research database.
Methods: This cross-sectional study compared records from claim data with those from a medical center. From 2007 to 2014, a COPD cohort was constructed from claim data using ICD9-CM codes for COPD. The diagnostic positive predictive value of these data was assessed with reference to physician-verified COPD. In addition, a multivariate logistic regression model was built to identify independent factors associated with the positive predictive value of COPD diagnosis by claim data.
Results: During the 8-year study period, a total of 12,127 subjects met the criterion of having two or more outpatient codes in 1 year or one or more inpatient COPD codes in their claim data. Of this total, the diagnosis of COPD was verified by physicians in 7,701 (63.5%) subjects. Applying a more stringent criterion – three or more outpatient codes or two or more inpatient codes – improved the diagnostic positive predictive value to 72.2%. Age ≥65 years and a claim for spirometry were the two most important factors associated with the positive predictive value of claim-data-defined COPD. Adding spirometry testing to diagnostic ICD9-CM codes for COPD increased the positive predictive value to 84.6%.
Conclusion: This study emphasizes the importance of validation of disease-specific diagnosis prior to applying an administrative database in clinical studies. It also indicates the limitation of ICD9-CM codes alone in recognizing COPD patients within the NHI research database.

Keywords: chronic obstructive pulmonary disease, database, International Classification of Diseases code, Taiwan, validity
 

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