• J Gjonbrataj, W-I Choi, Y E Bahn, B H Rho, J J Lee, and C W Lee.
• Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Republic of Korea; Department of Internal Medicine, Mother Thereza University Hospital, Tirana, Albania.
• Int. J. Tuberc. Lung Dis. 2015 Jun 1; 19 (6): 742-6.

ObjectiveTo estimate the annual incidence rate of interstitial lung disease (ILD) and idiopathic pulmonary fibrosis (IPF) in Korea.DesignA retrospective cohort design using the Korean Health Insurance Review and Assessment Service (HIRA) database spanned the period from January 2008 to December 2012. Patients with ILD and IPF were identified based on the International Classification of Disease-10 (ICD-10) diagnosis and procedure codes. Definition 1 is code J84 (ILD); Definition 2 is code J84 plus high-resolution computed tomography (HRCT), bronchoalveolar lavage (BAL) or lung biopsy; Definition 3 is code J84.1 (ILD with fibrosis); Definition 4 is code J84.1 and HRCT, BAL or lung biopsy; and Definition 5 is code J84.1A (IPF), and was specifically implemented for IPF.ResultsThe incidence rates of ILD per 100,000 population based on Definitions 1-5 were respectively 48.5, 32.2, 16.2, 11.4 and 1.7.ConclusionThe incidence of ILD with fibrosis was approximately 23% of overall ILD incidence. IPF incidence was approximately 10% of the incidence of ILD with fibrosis. Based on the new ATS/ERS/JRS/ALAT statement published in 2011, the incidence rate of IPF was 1.7/100,000.

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