Continuous Glucose Monitor for Mayo Clinic Advanced Care at Home Patients

Inclusion Criteria: * Patients who are admitted to Advanced Care at Home (ACH) Program and supposed to remain in ACH for at least 72 hours. * Patients with previous diagnosis of DM type 1 or type 2. * Patients taking subcutaneous (SQ) insulin either via multidose injections or SQ insulin pump. * Capable of giving signed informed consent Exclusion Criteria: * Actively treated for diabetes ketoacidosis (DKA) or hyperosmolar hyperglycemic state (HHS). * Participants taking acetaminophen more than 4g per day or more than 1gm every 6 hours. * Participants with altered mental status. * Participants diagnosed with dementia. * Patients with suicidal ideations or experiencing suicidal behavior. * Patients with liver cirrhosis. * Patients with End Stage Renal Disease on dialysis bot hemodialysis or peritoneal dialysis. * Participants with allergy to medical grade adhesive or medical tape. * Participants taking hydroxyurea. * Participants who are pregnant, wanting to become pregnant, or nursing during study period. * Patients with a planned MRI within the following 10 days after admission to ACH. * Participants currently using continuous glucose monitor (CGM) to dose insulin or check glucose level. * Participants with diabetes mellitus (DM) treated with diet alone. * Participants with DM treated with oral hypoglycemic medications. * Participants with DM treated with one SQ insulin injection daily. * Participants enrolled in other studies addressing CGM use. * Participants physically or emotionally incapable of handling a cell phone with a smart display. * Participants with hearing impaired to a degree that they are not able to hear a smart phone alert or alarm. * Patients lacking WIFI or Cellular coverage needed to connect the monitoring cell phone to Internet network.