ICD10 to SNOMED-CT, READ2, CTV3, and OPCS4 in one move.
Uses the TRUD NHS Data Migration mapping tables to provide a lookup table for the above. https://isd.digital.nhs.uk/trud/users/guest/filters/0/categories/9/items/9/releases
Function provided that takes an excel file of ICD10 codes and provides the matched codes.
All credit to @anoopshah for Rdiagnosislist which does all the heavy lifting.