OpenCodelists is a rapidly-changing work in progress. It will be a platform for the development and dissemination of codelists for use in medical research.
It is part of the OpenSAFELY project, and is currently served from codelists.opensafely.org.
It hosts codelists used in our paper on factors associated with COVID-19-related hospital death in the linked electronic health records of 17 million adult NHS patients.