The Dexcom Global Registry study looks at how people use the Dexcom Continuous Glucose Monitoring System (CGM) in their everyday lives. A CGM is a device that helps people with diabetes track their blood sugar levels throughout the day and night. This study collects information from people who already use the Dexcom CGM. It is not a test where people are chosen randomly; instead, it collects data from those who use it as part of their regular care. Participants must be able to use the Dexcom CGM correctly and agree to share their experiences with researchers. They also need to have a blood test called HbA1C (Hemoglobin A1c) within three months before starting the Dexcom CGM. This test measures average blood sugar levels over a few months. The study includes regular check-ins with healthcare providers, and participants must provide consent to share their data. Some people may not join if the device is not safe for them, or if their doctor thinks it's not a good idea.

• Study Length: Participants will check in with providers at least twice a year.
• Data Collection: Information will be collected both from the past and as it happens.
• Consent Required: Participants must agree to share their data for the study.