NHS Diabetes and the RCGP have published a review of the diagnosis, classification and coding of diabetes in primary care in England. Newly discovered variants of diabetes, in addition to Type 1 and Type 2, have made diagnosis more complex. While NHS primary care is getting the diagnosis correct in the vast majority of cases, there is evidence of some errors and omissions in the classification of diabetes. The report provides a simple classification formula to help make more accurate diagnoses. To support GPs in identifying patient records that may require review, audit tools have been developed that can automatically search the GP record system. The cases flagged can be considered during regular check ups and any necessary corrections can be made by the GP during the consultation, or by practice staff.