Patient presents with signs and symptoms suggestive of diabetes mellitus, but the specific type (type 1, type 2, or other specific types) cannot be definitively determined at this time.  Presenting complaints include polyuria, polydipsia, and unexplained weight loss.  Fasting blood glucose levels are elevated, confirming hyperglycemia.  However, further diagnostic testing, such as HbA1c, C-peptide levels, and autoantibody tests, is required to differentiate between type 1 and type 2 diabetes mellitus or other specific types.  The patient denies any family history of diabetes.  Review of systems is otherwise unremarkable.  Assessment: Unspecified Diabetes Mellitus (ICD-10-CM code E14.9).  Plan:  Order HbA1c, C-peptide, and autoantibody panel.  Initiate lifestyle modifications including dietary counseling focused on carbohydrate control and a moderate exercise program.  Patient education provided regarding diabetes management, including blood glucose monitoring and potential medication needs.  Follow-up appointment scheduled in two weeks to review lab results and determine appropriate diabetes management strategy.  Differential diagnosis includes type 1 diabetes, type 2 diabetes, gestational diabetes (if applicable), and other specific types of diabetes.  Medical billing codes will be finalized upon confirmation of the specific diabetes type.