The majority of inpatients with Covid-19 are admitted as a result of the infection. A subset of those who contract Covid in the community and are asymptomatic, or exhibited relatively mild symptoms that on their own are unlikely to warrant admission to hospital, will then be admitted to hospital to be treated for something else and be identified through routine testing.
However these patients still require their treatment in areas that are segregated from patients without Covid, and the presence of Covid can be a significant co-morbidity in many cases.
Equally, while the admission may be due to another primary condition, in many instances this may have been as a result of contracting Covid in the community. For example research has shown that people with Covid are more likely to have a stroke in these cases people would be admitted for the stroke, classified as ‘with’ Covid despite having had a stroke as a result of having Covid.