Missed and delayed diagnosis are a known cause of preventable adverse events. In this cohort of 107 patients with severe or critical COVID-19 in Wuhan, China, 45% developed acute kidney injury (AKI). However, nearly half of those patients (46%) were not diagnosed during their stay in the hospital. Patients with undiagnosed AKI experienced greater hospital mortality than those without AKI or diagnosed AKI. Involvement of intensive care kidney specialists is recommended to increase diagnostic awareness.