This report is part of a series of country reviews of health information systems that was launched by the OECD Working Party on Health Care Quality and Outcomes (HCQO) and is part of the 2021/22 programme of work of the OECD Health Committee. The OECD thanks the experts in Korea that gave of their time to participate in interviews and focus groups. The OECD acknowledges colleagues at the Korean Health Insurance Review and Assessment Service (HIRA) – especially Seol-hee Chung, Junghoe Koo, Mi-Jung Son, Yu-hyun Shin, and Kyung-chang Kim – for their support in co‑ordinating this review. The report was authored by Jillian Oderkirk and Luke Slawomirski with input and guidance from Dongwoo Lee, Niek Klazinga and David Morgan, and assistance from Ricardo Sanchez Torres. Thanks are extended to Francesca Colombo, Frederico Guanais, Mark Pearson and Stefano Scarpetta for reviewing this report. The review team also wish to thank the Korean experts who participated in the interviews and focus groups that informed this report (see Annex A).