The Dexcom G6 Sensor is a wearable continuous glucose monitoring (CGM) device that helps people with diabetes track their glucose levels without routine fingerstick testing. Each sensor works for up to 10 days before requiring replacement, making correct placement, maintenance, and supply planning essential.
If you’re wondering how much a replacement costs, where to wear the sensor, or what to do when it stops working, understanding the basics can prevent unnecessary interruptions.
There is also a major change in 2026: Dexcom has ended G6 manufacturing in the United States. This guide explains how the system works, how to change sensors safely, what coverage and savings options exist, and what current users should know about availability.
The Dexcom G6 Sensor measures glucose levels continuously for up to 10 days. It requires a separate reusable transmitter and a compatible display device. Replacement costs depend on insurance, pharmacy pricing, and available discounts. Dexcom stopped manufacturing the G6 on July 1, 2026, so remaining supplies may become difficult to obtain.
What Is the Dexcom G6 Sensor?
The Dexcom G6 is a continuous glucose monitoring system designed for people with diabetes ages 2 and older. A small sensor placed beneath the skin measures glucose in interstitial fluid, while a transmitter sends readings to a compatible smartphone or dedicated receiver.
Unlike a standard blood glucose meter, the G6 provides automatic readings approximately every five minutes. It also shows glucose trends and can alert users to potentially high or low levels.
The system has three main components: a disposable sensor, a reusable transmitter, and a compatible display device. Although routine calibration is not required when the sensor is started correctly with its code, a blood glucose meter remains necessary when readings do not match symptoms.
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How Long Does the Dexcom G6 Sensor Last?
A Dexcom G6 Sensor lasts up to 10 days, after which the sensor session automatically ends. The system sends advance notifications so users can prepare a replacement.
Three sensors normally provide approximately 30 days of monitoring. However, individual sensors may need earlier replacement because of adhesive problems, discomfort, or device failure.
The transmitter operates separately and has a battery life of approximately three months. It can be transferred between new sensors until its replacement notification appears.
According to Dexcom’s official guidance, a used G6 sensor should not be restarted after its approved 10-day lifespan.
Dexcom G6 Sensor Placement: Where Should You Wear It?
Correct placement helps the sensor remain secure and function as intended.
In the United States, Dexcom identifies the following insertion locations:
- Abdomen: Approved for users ages 2 and older.
- Upper buttocks: Approved for children and teenagers ages 2–17.
The insertion area should be at least three inches away from insulin pump infusion sets or insulin injection sites.
Avoid areas affected by scars, tattoos, irritation, waistbands, or frequent pressure. Rotate insertion sites when changing sensors to reduce skin irritation.
Follow the official Dexcom placement instructions rather than assuming that placement recommendations for newer CGM models also apply to the G6.
How to Change a Dexcom G6 Sensor
Changing the sensor is a routine part of using the system. Follow your G6 app or receiver prompts and the manufacturer’s instructions throughout the process.
Step 1: End the Current Sensor Session
After 10 days, the session ends automatically.
To change a sensor early, open the Dexcom G6 app, go to the main menu, select “Stop Sensor,” and confirm. This stops the existing session before a new sensor is started.
Step 2: Remove the Old Sensor
Carefully peel the adhesive patch away from your skin like a bandage. The sensor holder and transmitter will come off together.
After removing the patch, bend the wide edge of the holder to release the transmitter. Keep the transmitter if it still has battery life.
Step 3: Prepare the New Insertion Site
Wash and dry your hands. Choose an approved location different from the previous insertion site.
Clean the skin using rubbing alcohol and let it dry. Check the new sensor’s expiration date and packaging before opening it.
Step 4: Insert the New Sensor
Enter the new sensor code when prompted. Remove the applicator’s adhesive labels, place the applicator against your prepared skin, remove the safety guard, and press the insertion button.
Remove the applicator after insertion.
Step 5: Attach the Transmitter and Start
Clean and dry the reusable transmitter according to the instructions. Insert its narrow tab into the sensor holder and snap it securely into place.
Start the new session using the app or receiver. The G6 requires a two-hour warmup period, during which glucose readings and alerts are unavailable.
Dexcom provides a detailed sensor replacement tutorial.
Dexcom G6 Sensor Cost: How Much Does It Cost?
There is no single reliable price for every Dexcom G6 Sensor purchase in the United States. Actual costs depend on insurance benefits, pharmacy or distributor pricing, and remaining inventory.
The discontinuation of manufacturing also makes it important to confirm whether a supplier can fulfill future prescriptions.
| Payment Method | What Affects Your Cost |
|---|---|
| Private insurance | Copays, deductibles, coverage rules, and pharmacy benefits |
| Paying cash | Available inventory, retailer pricing, and discounts |
| Medicare | Eligibility, Part B deductible, and applicable coinsurance |
| Dexcom savings coupon | Current promotional terms and eligible cash purchases |
Under Medicare Part B, eligible beneficiaries generally pay 20% of the Medicare-approved amount after meeting their deductible, provided the supplier accepts assignment.
Dexcom has offered a pharmacy savings program advertising $210 off a 30-day sensor supply. Its published terms require eligible customers to purchase at the retail cash price rather than combine the offer with insurance coverage.
Check the Dexcom Savings Center for current offers and confirm availability with your pharmacy before relying on a coupon.
Dexcom G6 Sensor Error and Failure: What Should You Do?
A Dexcom G6 sensor error does not always mean the sensor has permanently failed.
Temporary interruptions can occur because of communication problems, insertion issues, or an improperly attached transmitter.
If the device displays “Sensor Error,” Dexcom recommends checking the alert details and allowing up to three hours for the system to recover.
If the screen displays “Sensor Failed,” a new sensor is required.
During periods without reliable CGM readings, use a blood glucose meter for treatment decisions. If your readings do not match how you feel, follow your diabetes care plan and seek medical guidance when appropriate.
Can You Get a Free Replacement for a Failed Sensor?
Dexcom’s replacement policy provides replacements without a numerical limit for sensor failures confirmed to be product-related during the intended wear period.
Other situations, including accidental removal, may qualify for a courtesy replacement on a case-by-case basis.
Keep the transmitter serial number and relevant packaging information. Contact Dexcom Technical Support at 1-844-607-8398 to report a failure.
Can You Reuse a Dexcom G6 Sensor?
No. Dexcom G6 sensors are single-use medical devices and are not designed to be restarted or reused beyond 10 days.
Although unofficial methods for extending sensor life appear online, they fall outside the manufacturer’s approved instructions.
Reusing a sensor may compromise reliable monitoring. The reusable component is the separate transmitter, which can be moved to another sensor while its battery remains functional.
Is the Dexcom G6 Sensor Still Available in 2026?
Dexcom officially ended G6 manufacturing on July 1, 2026. Pharmacies and medical distributors may continue selling remaining inventory, but the manufacturer does not guarantee future availability.
Dexcom recommends that existing users discuss transitioning to the Dexcom G7 or G7 15 Day with their healthcare provider.
Anyone using an automated insulin delivery system should confirm compatibility before switching. The newer sensor must work with their specific insulin pump and other connected equipment.
Dexcom states that technical support continues for its G6 app and unexpired supplies within their warranty periods.
Read the official G6 transition information before arranging future prescriptions.
Conclusion
The Dexcom G6 Sensor provides continuous glucose monitoring for up to 10 days, but it requires regular replacement, careful placement, and a working transmitter. Understanding the correct replacement process and troubleshooting common errors helps users avoid unnecessary interruptions.
Costs vary depending on coverage and available discounts, while confirmed device failures may qualify for manufacturer replacements.
With G6 manufacturing discontinued in July 2026, long-term supply planning is particularly important. Existing users should check remaining inventory, review their coverage, and speak with their healthcare provider about a compatible replacement system before their current supplies run out.
Frequently Asked Questions
1. How Often Do You Change the Dexcom G6 Sensor?
The Dexcom G6 Sensor must be replaced every 10 days. Its session automatically ends when the approved wear period expires. You may need to replace it earlier if the sensor fails, becomes detached, or causes significant discomfort. Always start a new sensor session after replacement.
2. How Much Does a Dexcom G6 Sensor Cost Without Insurance?
The cash price depends on the pharmacy, supplier, discounts, and remaining stock. Dexcom has advertised savings of $210 on a monthly sensor supply through its pharmacy coupon program. Confirm the final price and product availability directly with the supplier before purchasing.
3. Can You Change a Dexcom G6 Sensor Before 10 Days?
Yes. You can manually stop the existing sensor session and insert a new sensor before the 10-day period ends. Early replacement may be necessary because of device failure, skin irritation, or adhesive problems. A new sensor requires another two-hour warmup period.
4. What Happens If Your Dexcom G6 Sensor Stops Working?
Check the message displayed in your app or receiver. A temporary sensor error may resolve within three hours, but a confirmed “Sensor Failed” message requires replacement. Use a blood glucose meter while reliable readings are unavailable, and contact Dexcom support if necessary.
5. Where Can You Find the Dexcom G6 Sensor Number?
The G6 sensor has a four-digit code printed on its adhesive backing, which is used when starting a new session. The separate transmitter has a serial number printed on its housing and packaging. You can also locate the transmitter serial number in the app settings.
6. Can You Restart or Reuse a Dexcom G6 Sensor?
No. Dexcom specifies that each G6 sensor is intended for one session lasting no more than 10 days. Restarting or reusing a worn sensor is outside the manufacturer’s instructions. The separate transmitter, however, is reusable for approximately three months.
7. Is Dexcom G6 Being Discontinued?
Yes. Dexcom stopped manufacturing the G6 in the United States on July 1, 2026. Remaining supplies may still be available, but inventory is not guaranteed. The company recommends discussing a transition to Dexcom G7 or G7 15 Day with a healthcare professional.
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