For many people living with diabetes, blood sugar management still feels like guesswork. You eat, you wait, you check your sugar, and you react to the number you see. If it’s too high or too low, you adjust after the fact. The problem is that much of the damage diabetes causes happens in the hours and days between those checks, when no one is looking.
A Continuous Glucose Monitor, or CGM, changes that entire experience. It turns blood sugar from something you occasionally measure into something you can actually understand. It shows patterns, trends, and warning signs before a crisis happens.1
And yet, despite how powerful this technology is, millions of people who could benefit from a CGM do not have access to one. The reason is rarely medical. It is almost always cost and insurance coverage.2
This is not just a story about technology. It is a story about who gets preventive, modern care and who is left managing a serious chronic disease with outdated tools.
What is a Continuous Glucose Monitor?
A Continuous Glucose Monitor (CGM) is a small wearable medical device that tracks your blood sugar throughout the day and night.1
Instead of relying on finger-stick tests that provide only a few snapshots, a CGM uses a tiny sensor placed just under the skin to measure glucose in the fluid between your cells.1 It sends a new reading every few minutes to a phone or receiver. That means you don’t just see where your blood sugar is right now. You can see where it has been and where it is going.1
This matters because blood sugar is not static. It rises and falls with meals, exercise, stress, sleep, illness, and medication. Finger-stick testing misses most of that story.
A CGM fills in the gaps. It allows people and their doctors to see dangerous patterns, repeated overnight lows, post-meal spikes, or unpredictable swings that would otherwise stay hidden.1
In practical terms, this turns diabetes care from reactive to preventive. Instead of finding out you were low after you already feel shaky, or finding out you were high after hours of damage, you get earlier warnings and better information.1
Who CGMs Help, and Why They’re Not a “Nice-to-Have”
CGMs are most often prescribed for people with type 1 diabetes and for people with type 2 diabetes who use insulin, especially those on multiple daily injections. They are also used for people who have frequent low blood sugar episodes, unpredictable glucose levels, or difficulty sensing when their blood sugar is dropping.1
But the real value of a CGM is not about diagnosis labels. It is about risk. Poorly controlled or highly variable blood sugar increases the risk of emergency room visits and hospitalizations in the short term, and heart disease, kidney failure, vision loss, and nerve damage in the long term.3
Large clinical studies have shown that people who use CGMs tend to spend more time in safe glucose ranges and experience fewer dangerous lows.3 In other words, CGMs don’t just make diabetes easier to manage, they ultimately make it safer.3
Why Access to CGMs Has Become a Health Equity Issue
Diabetes already places a heavier burden on Black, Latino, and Indigenous communities. These communities are more likely to develop diabetes, more likely to experience serious complications, and more likely to be hospitalized or die from diabetes-related causes.3
At the same time, they are less likely to have access to advanced diabetes technologies like CGMs and insulin pumps. This gap is not about motivation or education. It is driven by insurance coverage gaps, higher out-of-pocket costs, less access to specialists, more restrictive approval rules, and long-standing inequities in how care is delivered and funded.3
When some people can see their blood sugar in real time and receive alerts before dangerous drops, while others are forced to rely on a few finger sticks and guesswork, the risks are not evenly distributed. Over years, those differences compound—complications appear earlier, crises happen more often, and disability arrives sooner.3
CGMs do not fix every problem in diabetes care, but lack of access to them absolutely deepens the disparities that already exist.3
Many People are Denied Before They Are Helped
Despite strong medical evidence, many insurance plans still rely on outdated rules to decide who “qualifies” for a CGM. Some require proof of multiple daily insulin injections. Others require documented severe low blood sugar episodes. Some want evidence that finger-stick testing has already failed.2
In practice, this means many people are told no until they have already had a dangerous event.
The system often waits for harm before it authorizes prevention.2
That is why denial letters are so common and why so many people who would benefit from CGMs never get them, or only get them after months of appeals and paperwork.2
Why This Matters For Your Long-term Health
Diabetes does not usually cause damage all at once. It harms the body slowly, over years, by injuring blood vessels, nerves, kidneys, eyes, and the heart.
By the time symptoms appear, some of that damage is already permanent. This is how people end up with kidney failure, vision loss, neuropathy, heart disease, and strokes that seem to come out of nowhere.3
The real power of a CGM is not just fewer bad days. It is fewer bad years. By helping people stay in safer glucose ranges more consistently, CGMs reduce the invisible wear and tear that leads to life-altering complications.3
How to Get Your Insurance to Cover a Continuous Glucose Monitor (CGM)
Getting a CGM covered is not always simple, but many people are approved when the process is approached the right way. Think of this as building a medical case, not just requesting a device.
Step 1: Start with the right conversation with your doctor
This begins in the exam room, not with your insurance company. You want your doctor to document medical necessity, not just interest.4
You can say: “I’m concerned about my blood sugar swings and my long-term risk of complications. I want to talk about whether a CGM would make my treatment safer and more effective”.
Make sure your doctor documents things like:
- Episodes of low blood sugar, especially if they are hard to predict
- Wide swings in glucose (sugar) levels
- Trouble reaching A1C goals
- Fear of hypoglycemia (low blood sugar)
- Any ER visits or close calls
- Any barriers to frequent finger-stick testing
Step 2: Ask who handles prior authorizations in the clinic
Most CGM requests go through a process called prior authorization, where your doctor’s office sends paperwork to your insurance company explaining why the device is medically necessary.4
It is reasonable to ask who in the clinic handles this process and how you can follow up. Many delays happen simply because paperwork stalls.4
If you are denied, that is common and it is not the end. Many people are approved on appeal after their doctor submits additional documentation explaining safety risks, glucose instability, or treatment limitations without a CGM.4
If you receive a denial, you can call your insurer and ask what additional information is needed to appeal the decision.4 If you need the words to say, try this:
Ask directly: “Who submits CGM prior authorizations here, and how can I follow up?”
Then: “What documentation will you include to support medical necessity?”
Step 3: If you are denied, appeal. Many people are approved on appeal.
A denial is extremely common. It is not the end.4 If you get a denial letter, call and say: “I want to appeal this decision. What additional information do you need from my doctor?”
Often times, it might just require an additional letter clarifying:
- Safety risk
- Treatment necessity
- Or failure of current monitoring
Step 4: Know the Medicare and Medicaid landscape
Medicare covers CGMs for many people who use insulin or have problematic hypoglycemia (low blood sugar). Medicaid coverage varies by state, but many states do cover CGMs with specific criteria.4
If you’re told “it’s not covered,” ask: “Can you show me the written medical policy, and is there an exception or appeal pathway?”
Sometimes the issue is not whether it’s covered, but how the request is coded and justified.4
Step 5: Use manufacturer assistance programs if there’s a delay
While insurance decisions are pending, many CGM manufacturers offer temporary assistance programs or starter supplies. These can sometimes help bridge the gap.4
The process can be frustrating, but many people are successful when the request is framed clearly as a matter of safety and medical necessity.4
A Call to Action for the NOWINCLUDED Community
Too many people in our communities are managing one of the most dangerous chronic conditions in America with less information and more risk than they deserve.3
In the NOWINCLUDED app, tell us: Has a doctor ever talked to you about a CGM? Have you tried to get one through insurance? What happened?
Your experience could help someone else realize they should ask — and keep asking — for better care.
References
- NIH. (2023, June ). Continuous Glucose Monitoring. Retrieved from National Institute of Diabetes and Digestive and Kidney Diseases: https://www.niddk.nih.gov/health-information/diabetes/overview/managing-diabetes/continuous-glucose-monitoring
- Wallia, A., Agarwal, S., Owen, A. L., Lam, E. L., & Davis, K. (2024). Disparities in Continuous Glucose Monitoring Among Patients Receiving Care in Federally Qualified Health Centers. JAMA Network Open. doi:10.1001/jamanetworkopen.2024.45316
- Patel, P. M., Thomas, D., Liu, Z., Aldrich-Renner, S., Clemons, M., & Patel, B. V. (2024). Systematic review of disparities in continuous glucose monitoring and insulin pump utilization in the United States: Key themes and evidentiary gaps. Diabetes, Obesity and Metabolism. doi:https://doi.org/10.1111/dom.15774
- Hopcroft, A. (2024, May 28). How To Navigate CGM Insurance Coverage. Retrieved from DiaTribe Learn: https://diatribe.org/diabetes-technology/how-navigate-cgm-insurance-coverage
