Hi, Thanks for writing in. A HbA1C level of 6.3 is at upper limit of pre diabetes. It shows that your diabetes is under satisfactory control and you are taking medications oral hypoglycemeic agents properly. Kidneys always get affected after some years in diabetes. This cannot be totally avoided but you can delay it by having balanced diet and taking medications regularly. A normal level of blood glucose will help in maintaining the balance. Please get your eyes and kidneys checked regularly. Kidney must be assessed by doing serum creatinine test and urinary proteins. This will guide you through future treatment. Please do not worry.