NHS PCD refsets and NHS drug refsets updated in OpenCodelists

The NHS PCD (Primary Care Domain) reference sets (refsets) and NHS drug refsets are a collection of codelists used in NHS business rules. We have recently imported the latest NHS PCD refsets and the latest NHS drug refsets into OpenCodelists. These refsets (tagged 20250912) are now available for use in OpenSAFELY analyses, ensuring researchers have access to the most up-to-date resources.