Getting Started

I lost my Dexcom ONE sensor code. What do I do?

Last Updated · November 3, 2022

Unfortunately, the sensor code is required to use your Dexcom ONE system. If you have lost your sensor code, you will have to use a brand-new sensor.

Do not use a code from a different sensor or make up a code. If you do, your sensor will not work as well and could display inaccurate data.

5-step learning journey

Discover education resources, organised in a 5-step journey, to learn key information about your Dexcom ONE CGM system, from getting started, your first 10 days, to using Dexcom ONE in the long run.

Step 1: The basics of CGM
Step 2: Getting started
Step 3: Your first 10 days
Step 4: Using Dexcom ONE in the long run
Step 5: Understand your Diabetes trends