Z79.84 is a clinical status code used to denote that a patient is currently receiving long-term maintenance therapy with oral hypoglycemic medications. These drugs, including metformin, sulfonylureas, thiazolidinediones, and others, are primarily used to manage blood glucose levels in patients with Type 2 Diabetes Mellitus or other insulin-resistant conditions. The code serves as supplementary information to identify the patient's ongoing pharmacological management and is used alongside the primary diagnosis of the condition being treated. It is not used for short-term treatments or for patients whose diabetes is managed solely by diet or insulin.