For decades, people with diabetes relied on traditional glucometers, devices that require a fingerstick and blood sample to check blood sugar levels. While effective, this method can be painful, time-consuming, and discouraging, especially with multiple daily checks. Continuous glucose monitors (CGMs) are a significant advancement in diabetes care. These wearable devices track glucose levels in real-time without the need for routine fingersticks. Among the most recognized names in this space is Dexcom, a leader in CGM innovation.
Although CGMs have been FDA-approved since 1999, recent accuracy, affordability, and mobile integration improvements have fueled their widespread adoption. The Dexcom CGM, including the popular Dexcom G6 and Dexcom G7 sensors, has helped transform how people with type 1 and type 2 diabetes manage their health, offering continuous insights based on activity, food, and medications. This article will walk you through how Dexcom’s continuous glucose monitors work, compare the latest models like the Dexcom G7, explore pricing, and review how Dexcom stacks up against competitors in 2025.
What is Dexcom and Why It Matters
CGM, or continuous glucose monitor, is an advanced device that allows continuous glucose tracking with trend data and alerts. Unlike glucometers, which require frequent fingersticks and have limitations in real-time data, CGMs provide real-time glucose visibility that empowers patients to enhance their lifestyles to improve their health. Additionally, CGMs provide accurate interstitial glucose tracking, allowing doctors to make more confident medication changes and adjustments.
Among the leading and most trusted names in CGM technology, Dexcom is a healthcare technology company that specializes in CGMs. Dexcom offers a variety of options for patients, including the Dexcom G6, Dexcom G7, and Dexcom Stelo. Its systems are FDA-cleared for both personal and professional use, and are trusted by endocrinologists, primary care providers, and diabetes educators around the world. Dexcom’s emphasis on user-friendly design, mobile compatibility, and accurate glucose readings makes it a go-to option for patients seeking a modern approach to diabetes management.
Understanding Dexcom CGM
How Does It Work?
A Dexcom continuous glucose monitor is a device that tracks and monitors blood sugar levels in real-time. The Dexcom CGMs measure glucose levels from interstitial fluid every five minutes. The Dexcom CGMs include a reader and sensor that connect through Bluetooth technology. Some Dexcom CGMs may also include a transmitter, which wirelessly sends the glucose data from the sensor to the reader. In some older CGM models, the transmitter was a separate piece that had to be attached to the sensor once placed on the body. With newer models, the transmitter is built into the sensor and does not need to be removed or replaced. Additionally, with new models, a smartphone can act as the reader through an approved application, which can be downloaded onto your phone. This provides even more convenience because cell phones have become an integral part of our daily lives.
Comparing Dexcom G6 and Dexcom G7
Dexcom G6 Overview
The Dexcom G6 CGM system consists of the reader (a smartphone or separate device), a sensor, and a transmitter. The Dexcom G6 sensor is placed on the skin in the abdomen area with an auto applicator and is held on by an adhesive around the sensor. After the sensor is placed on the abdomen, the transmitter is attached to the sensor.
The Dexcom G6 has many standard CGM functions, including no scanning (automatic scans every 5 minutes), simple alerts that warn you of highs and lows, and an app that can be paired with the sensor to allow for real-time blood glucose tracking. It requires a 2-hour warm-up period after insertion and has a sensor wear time of 10 days.
Dexcom G7 Sensor Features and Benefits
The Dexcom G7, compared to the G6, has improved features and benefits worth noting. The sensor is smaller and an all-in-one wearable, meaning the transmitter is hidden within the sensor. The Dexcom G7 sensor only requires a 30-minute warm-up time. It is also easier to apply, with a redesigned applicator that improves user comfort.
Key Differences: Dexcom G6 vs G7
Both the Dexcom G6 and G7 have sensors with a 10-day lifespan, requiring 3 sensor changes per month. However, the Dexcom G7 just received approval for a 15-day sensor that requires only 2 sensor changes per month, making it more convenient. The app and reader are similar in many ways, but there are some important differences to note.
| Dexcom G6 | Dexcom G7 | |
| Insertion Site | Abdomen | Abdomen or Arm |
| Warm-up time | 2 hours | 30 minutes |
| Sensor size | Small (W: 1.2″ x L: 1.8″) | Smallest (W: 1.07″ x L: 0.94″) |
| Components | Separate sensor and transmitter | All-in-one sensor and transmitter |
| Grace Period | No grace period | 12-hour grace period available |
| Pregnancy | Not indicated | Can be used in pregnancy |
| Sensor Duration | 10 days | Now available in a 15-day option |
Dexcom Pricing and Insurance Coverage
Commercial Insurance
Many commercial insurance plans cover the Dexcom continuous glucose monitor for individuals with type 2 diabetes who take insulin or have problematic hypoglycemia (low blood sugar). Depending on the type of insurance, patients may have a copay each time they pick up a prescription of sensors.
Medicare
Medicare Part B may cover a Dexcom continuous glucose monitor through a durable medical equipment (DME) supplier if patients with type 2 diabetes are being treated with insulin or are experiencing problematic hypoglycemia. For the CGM to be covered by insurance, your doctor must provide specific documentation, such as recent office visit notes and CGM training.
Medicaid
Each state’s Medicaid plans are different, and coverage varies. Similar to Medicare and commercial insurance, specific criteria may be required for the Dexcom CGM to be covered. Check with your state’s Medicaid plan to determine if CGMs are a covered benefit.
Cash
The price of continuous glucose monitors can be expensive, especially if an individual is paying cash, with costs ranging from $200 to $250 per month for a set of two sensors. Dexcom does have online coupons available for the Dexcom CGM, which can save you $210 on every 30-day supply of sensors. The Dexcom G7 price and Dexcom G6 price do not differ significantly. The Dexcom Stelo is available on their website for $99 (1 month supply or two sensors). This makes Stelo a more affordable option for those without insurance coverage.
The Dexcom App and Digital Tools
Dexcom App Overview
The Dexcom Clarity app, which is compatible with most iOS and Android devices, allows individuals to track real-time glucose updates, including glucose trends, time in target range, and alerts for both high and low blood sugars. If you are unsure if your device is compatible with the Dexcom device, you can search the list of compatible devices on the Dexcom website.
Data Sharing and Remote Monitoring
In addition to tracking blood sugars for self-monitoring, patients can also use the Dexcom Follow app, which allows their friends and family to see their glucose levels, providing an added layer of support, accountability, and safety.
Dexcom G6 and Dexcom G7 can be shared with up to 10 people, which can be especially ideal for pediatric or vulnerable populations. An adolescent with type 1 diabetes, for example, could share their glucose readings through the Dexcom Follow app with parents, siblings, and school staff.
Sensor Replacements and Reliability
Dexcom Replacement Sensor Process
It is not uncommon for CGM sensors to malfunction, which may be caused by several factors:
- Sensor placement and adhesion
- Interference with external factors (mobile phone, microwaves, or other electronic devices)
- Skin conditions
- Battery or power issue
- Device software updates
- Device compatibility
- User error
If you do experience issues with Dexcom sensors, you may contact Dexcom’s customer service to determine if you are eligible for a Dexcom replacement sensor.
Dexcom’s Newest Device: Dexcom Stelo
The Dexcom Stelo is the newest Dexcom CGM, which is available without a prescription. Dexcom has marketed these CGMs specifically for those with type 2 diabetes who are not on insulin. Individuals looking to track blood sugars for general health and wellness may also consider the Dexcom Stelo. The Dexcom Stelo sensor is paired with the Stelo app and is wearable for 15 days. Unlike G6 and G7, it does not include high or low alerts, as it is not intended for patients on insulin therapy.
Dexcom Competitors and Market Comparison
Dexcom vs Freestyle Libre
One of Dexcom’s main competitors is Abbott, which makes the Freestyle Libre CGM system. The newest models include the Freestyle Libre 2 and 3 Plus, which share features similar to those of the Dexcom G6 and Dexcom G7, including real-time alerts and app functionality.
According to independent clinical trials, including the 2024 iCGM Accuracy Study, Dexcom is considered one of the most accurate CGMs. However, recent head-to-head studies have also demonstrated similar accuracy, specifically compared to the Freestyle Libre CGM system.
Other Emerging CGMs
Major Dexcom competitors other than Abbott include Medtronic and Eversense. Medtronic’s Guardian system is often bundled with its insulin pump, limiting standalone use. Approved by the FDA in 2024, Eversense introduced the first one-year continuous glucose monitor (CGM). Eversense is approved for individuals 18 years or older, making it difficult to obtain for pediatric patients or those with type 1 diabetes. Dexcom remains a leader due to its ease of use, smartphone integration, and strong customer support infrastructure.
Who Should Use Dexcom CGM?
The Dexcom CGM system offers a few models intended for use in different populations:
- People with type 1 or insulin-requiring type 2 diabetes
- Athletes, pediatric patients, pregnant women, and high-risk users
- Those with type 2 diabetes not on insulin may consider Dexcom Stelo
Dexcom CGMs are also helpful for individuals who experience frequent hypoglycemia or hypoglycemia unawareness, as the real-time alerts can help prevent dangerous lows. Patients on complex insulin regimens or those adjusting to newly prescribed insulin therapy may also benefit from the additional data that a CGM provides.
Healthcare professionals may recommend Dexcom for patients struggling with glucose variability, those interested in optimizing nutrition or exercise for blood sugar control, or even individuals using telehealth services, since CGM data can be remotely shared with providers.
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Choosing the Right Dexcom CGM
Dexcom has emerged as a leading force in the continuous glucose monitoring space, offering advanced solutions that combine real-time data, digital convenience, and clinical accuracy. Whether you are newly diagnosed with diabetes or looking to fine-tune your glucose management, Dexcom CGMs offer an efficient, user-friendly option with strong clinical support.
With ongoing innovation, such as the new 15-day G7 sensors and the over-the-counter Stelo, Dexcom continues to expand access to glucose monitoring across a wider spectrum of users. From children to older adults, from insulin users to wellness-focused individuals, Dexcom’s product lineup adapts to modern needs while redefining what it means to live confidently with diabetes.
Frequently Asked Questions
