A hospitalist system in Korea was introduced to improve the quality of patient care and to help to reduce working time of medical residents.45 In 2016, the Korean Health Insurance Review and Assessment Service and the Ministry of Health and Welfare started a hospitalist pilot program.

In May 2019, the number of hospitalists in Korea has increased to 124.6 Patient safety issues, resident law, and the shortage of medical residents are leading to an increase in the demand for hospitalists in Korea. However, the effect of the hospitalist system in Korea remains unproven.

Since the health care system in Korea is different from that in the US, more related studies and evidence are needed to prove the hospitalist effectiveness in Korea. In a previous study, Ohm et al.5 provided evidence that the acute care medical unit in a Korean tertiary care hospital reduces the length of stay and shortens the emergency departments waiting time. This study did not include other quality indicators, such as the morbidity, mortality, readmission rate and patient or staff satisfaction due to the short-term transit care.

In 2018, the Korean Health Insurance Review and Assessment Service and the Ministry of Health and Welfare released a hospitalist pilot program preliminary report.6 This report showed hospitalist care improves patient satisfaction, nurse satisfaction, and resident satisfaction.

In this issue of the journal, Lee et al.7 compared the outcome (including length of hospital stay [LOS], in hospital mortality [IHM], and readmission rate) in patients with pneumonia or urinary tract infection in the general wards admitted via the emergency departments between hospitalists and non-hospitalists. They found that the hospitalist care reduced LOS more than the non-hospitalist care, and there was no difference in overall IHM between the two groups. In particular, patients in the hospitalist group with comorbidity had shorter LOS. However, they found the readmission rates of patients in the hospitalist group were significantly increased.

This study had some limitations. First, this study was a retrospective, single center study. Second, this study lacks a logical explanation for increased readmission rates. Finally, only two hospitalists worked during the day servicing inpatient care.

Despite its limitations, this study demonstrates hospitalist care in Korea is associated with a reduced length of stay. Further studies are necessary to prove the hospitalist effectiveness in Korea.