What is a sensor code and why do I need one?

A sensor code allows you to use the Dexcom ONE CGM System without the need for finger pricks or calibrations.^* When you start a new sensor, you must enter a code into your display device, either manually or by taking a photo, as each sensor has its own code printed on the back of the adhesive patch. 

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. 

* Finger pricks required for diabetes treatment decisions if symptoms or expectations do not match readings.