Hey, all, appreciate the input! I'm new to ER coding and finding LOTS of questions! Regarding the above info, had similar scenario. Under PFSH, DM is listed for patient, and indeed, patient med list has Glucophage listed. Patient came to ER after glucose meter gave reading of 320. Final Impression by ED doc is hyperglycemia. Patient was given IV fluids. It seems to me that if the patient is taking DM meds and uses a glucose meter, that I should code DM as the principal dx. However, as noted, the ED doc never mentions DM anywhere. Suggestions? Thanks for any ideas.