Clinical coding of long COVID in English primary care: a federated analysis of 58 million patient records in situ using OpenSAFELY

Long COVID describes new or persistent symptoms at least 4 weeks after onset of acute COVID-19. Clinical codes to describe this phenomenon were recently created.To describe the use of long-COVID codes, and variation of use by general practice, demographic variables, and over time.Population-based cohort study in English primary care.Working on behalf of NHS England, OpenSAFELY data were used encompassing 96% of the English population between 1...