Codes indicating COVID-19 case (1 of 13 possible types of CTV3 codes that contain information related to COVID-19)
Search of TPP CTV3 codes for terms relating to coronavirus, with additional (manual) check for any missing terms against the SNOMED list of COVID-19 related codes.
Classification as "case" was then performed following review of terms by six OpenSAFELY team members (including epidemiologists, clinicians, statisticians and infectious disease modellers).
This definition has been computed by taking the manually created full codelist and converting it to a list of rules that define the codelist.
|Y228f||Self-isolation to prevent exposure of community to contagion|
|Y22a6||Household isolation note issued to patient (finding)|
|Y22a7||Household isolation to prevent exposure of community to contagion|
|Y22ac||Has National Health Service digital isolation note (finding)|
|Y22ad||Self-isolation note issued to patient (finding)|