Getting insurance to cover a continuous glucose monitor (CGM) usually comes down to proving medical necessity, submitting the right documentation, and knowing which channel to use for the lowest cost. Most private insurers and Medicare do cover CGMs, but the approval process can feel like a maze. Here’s how to navigate it.
What Insurance Companies Require
Every insurer has its own criteria, but the core requirements overlap. Medicare covers CGMs if you take insulin or have a history of problematic low blood sugar (hypoglycemia), and your provider confirms that you or your caregiver have been trained to use the device as prescribed. Private insurers like UnitedHealthcare follow a similar framework, typically requiring that you have diabetes managed with insulin therapy or documented hypoglycemic episodes.
For continued coverage, most plans require a follow-up visit with your provider every six months. At that visit, your doctor documents that you’re still using the CGM, following your diabetes treatment plan, and benefiting from the device. Missing these check-ins is one of the easiest ways to lose coverage, so mark your calendar.
If you have type 2 diabetes and don’t use insulin, coverage is harder to get but not impossible. Medicare now covers CGMs for people with a history of hypoglycemia even without insulin use. Some private insurers are following suit, especially when your doctor can show that a CGM would prevent dangerous blood sugar drops or improve an A1C that’s above 7%.
Build a Strong Case Before You Apply
The single most important factor in getting approved is the documentation your doctor submits. Insurance companies want to see clear evidence that a CGM is medically necessary for you specifically, not just generally useful. Before your provider sends anything in, make sure your medical record includes:
- Blood glucose logs showing patterns that are difficult to manage with fingerstick testing alone, such as overnight lows or wide swings throughout the day
- A1C results demonstrating suboptimal control (typically 7% or higher)
- A history of hypoglycemic episodes, especially severe ones requiring assistance from another person or readings below 54 mg/dL
- Documentation of your current treatment plan, including medications and any prior attempts to adjust them
Your doctor writes what’s called a letter of medical necessity. This letter should explain why fingerstick monitoring isn’t sufficient for your situation and how a CGM will improve your outcomes. A vague letter gets denied. A specific one, packed with your actual glucose data and complication history, gets approved.
Ask About Pharmacy vs. Medical Benefits
This is a detail most people miss, and it can make a real difference in both cost and convenience. CGMs can be covered under your plan’s medical benefit (as durable medical equipment) or under your pharmacy benefit. The channel matters.
When a CGM goes through the medical/DME route, your doctor typically has to complete extensive prior authorization paperwork and submit it to a DME supplier. You may wait days or weeks for delivery. When it goes through the pharmacy benefit, the process is simpler: your doctor fills out a shorter form, and you pick up your sensors at a local pharmacy, often within a day or two. A growing number of insurers, including several state Medicaid programs, have shifted CGM coverage to the pharmacy channel specifically because it lowers costs and gets devices to patients faster.
Call the number on the back of your insurance card and ask: “Is my CGM covered under pharmacy or medical benefits?” If both options exist, ask which one gives you a lower copay. Nine out of ten Americans live within five miles of a community pharmacy, so the pharmacy route is almost always more convenient.
What to Do if You’re Denied
A denial is not the end. More than 50% of appeals for CGM coverage are ultimately successful, and the rate may be even higher for employer-sponsored self-insured plans. The appeals process has three levels, and you should use them.
The first-level appeal is straightforward: you or your doctor contacts the insurance company and asks them to reconsider. Your doctor can also request a “peer-to-peer review,” which means speaking directly with the insurance company’s medical reviewer to explain why the CGM is necessary. This conversation alone resolves many denials, because the reviewer gets to hear the clinical reasoning firsthand rather than just reading a form.
If that doesn’t work, the second-level appeal goes to a medical director at the insurance company who wasn’t involved in the original decision. At this stage, include any additional documentation: updated glucose logs, new A1C results, letters from specialists.
The third level is an independent external review, where a reviewer outside your insurance company evaluates the case. This is your strongest protection, because the reviewer has no financial incentive to deny you.
Common Denial Reasons and How to Counter Them
If the denial says your CGM is “not medically necessary,” work with your doctor to submit stronger evidence of poor glucose control, hypoglycemia episodes, or complications that fingerstick monitoring can’t prevent. If it says the device is “experimental or investigational,” your doctor can reference clinical guidelines from the American Diabetes Association that recommend CGM use. Sometimes the denial is just a clerical error: a typo in your policy number, a misspelled name, or a wrong billing code. Before you launch a formal appeal, call member services and ask them to double-check the paperwork.
Coverage for Gestational Diabetes
If you developed diabetes during pregnancy, CGM coverage varies widely by state and plan. Several state Medicaid programs now cover CGMs for gestational diabetes. Michigan, for example, doesn’t even require prior authorization for pregnant members with diabetes. Iowa and South Dakota cover CGMs with prior authorization and documentation of training. Kentucky covers it with a gestational diabetes diagnosis alone.
The challenge with gestational diabetes is timing. Long delays in processing CGM approvals can mean the device doesn’t arrive until late in pregnancy, or even after delivery, missing the window when it could actually help. If you have gestational diabetes and want a CGM, ask your provider to submit the request as early as possible and flag it as time-sensitive.
Manufacturer Programs That Lower Your Cost
Even with insurance, your out-of-pocket cost depends on your plan’s copay or coinsurance. If the cost is still too high, or if you’re waiting on an appeal, manufacturer programs can bridge the gap.
Dexcom offers a “Simple Start” program for commercially insured patients that brings the G7 down to $89 per month at a local pharmacy. For people without CGM coverage at all, Dexcom’s pharmacy savings program cuts over $200 per month off the retail price. FreeStyle Libre 3 sensors typically cost commercially insured patients between $0 and $75 per month. If you’re quoted more than $75 for two sensors, Abbott (the manufacturer) has a dedicated phone line at 844-330-5535 to help troubleshoot your coverage. They also offer a free trial through the MyFreeStyle program for both insured and cash-paying patients.
These programs won’t replace insurance coverage long-term, but they can keep you monitored while you fight for approval or switch plans during open enrollment.
Steps to Take This Week
Start by calling your insurance company and asking specifically whether CGMs are covered, what the prior authorization requirements are, and whether coverage falls under pharmacy or medical benefits. Then schedule an appointment with your provider to review your glucose data and discuss submitting a letter of medical necessity. Bring your blood sugar logs, your most recent A1C, and any records of hypoglycemic events. The stronger the file your doctor sends in, the less likely you are to need an appeal.
If you’ve already been denied, request a copy of the denial letter and check the reason. A clerical fix takes a phone call. A medical necessity dispute takes a peer-to-peer review and better documentation. Either way, the odds are in your favor if you push back.