Most insurance plans do cover continuous glucose monitors, but the level of coverage depends on your insurance type, your diagnosis, and how your diabetes is managed. Medicare, most commercial plans, and Medicaid in 45 states plus D.C. all provide some degree of CGM coverage for people with diabetes who meet specific criteria. If you don’t use insulin or don’t have a diabetes diagnosis, getting coverage becomes significantly harder.
Medicare Coverage Requirements
Medicare covers CGMs for beneficiaries who meet a specific set of conditions. You need a diabetes diagnosis, a prescription aligned with FDA indications, and documented training on how to use the device. Beyond that, you must fall into one of two categories: you’re currently treated with insulin, or you have a history of problematic low blood sugar episodes.
For people who aren’t on insulin, the hypoglycemia threshold is fairly strict. You need documentation of either more than one episode where your glucose dropped below 54 mg/dL despite multiple attempts to adjust your medications, or a single severe episode at that level where you needed someone else’s help to recover. Your prescribing provider also needs to conduct an in-person or telehealth visit evaluating your diabetes management before the initial CGM prescription. Medicare will also check that your supply usage matches how frequently you’re actually wearing sensors.
Commercial Insurance Coverage
Private insurance plans from employers or the marketplace generally cover CGMs, though the eligibility requirements vary by carrier. Most plans require prior authorization, meaning your doctor’s office submits clinical documentation before the insurer approves coverage. Some insurers still require proof that you’ve been checking your blood sugar with fingerstick tests three or more times daily before they’ll approve a CGM, though this requirement has been loosening.
Current clinical guidelines recommend CGM for adults with diabetes who are on multiple daily insulin injections, use an insulin pump, or are on basal insulin. These guidelines give your doctor strong backing when requesting coverage. Unlike Medicare, commercial plans don’t typically require a formal Certificate of Medical Necessity, but your doctor’s chart notes should clearly document why a CGM is appropriate for you. That documentation becomes critical if the insurer asks questions or if you need to appeal a denial.
Medicaid Coverage Varies by State
As of May 2023, 45 states and Washington, D.C. provide some level of CGM coverage through Medicaid. However, there’s no consistent national policy. Coverage criteria, approved devices, and out-of-pocket costs can differ significantly from one state to another. If you’re on Medicaid, checking your state’s specific policy or calling your plan’s member services line is the most reliable way to find out what’s covered for you.
DME Benefit vs. Pharmacy Benefit
How your CGM is billed makes a real difference in what you pay. Some plans classify CGMs under durable medical equipment (DME), where you get the device and sensors through a medical supply company. Others route it through your pharmacy benefit, where you pick up sensors at a drugstore like any other prescription.
Research published in The American Journal of Managed Care found that patients who got their CGMs through DME channels had 35% lower total costs over 12 months compared to those using pharmacy channels, saving an average of $3,875 per patient. DME suppliers also tended to provide better ongoing support, which translated into higher adherence rates. The pharmacy route is often simpler upfront, with your doctor filling out a single-page form, but the long-term costs and support can be less favorable. If your plan gives you a choice, it’s worth comparing your copays and deductibles under each benefit.
Prediabetes and Non-Diabetic Use
If you don’t have a diabetes diagnosis, insurance coverage for a CGM is unlikely. Medicare explicitly limits coverage to people with diabetes who use insulin or have documented hypoglycemia. Commercial plans follow a similar approach, tying coverage to established diabetes management needs. The growing consumer interest in CGMs for metabolic optimization, weight management, or prediabetes monitoring hasn’t translated into insurance coverage. If you want a CGM without a qualifying diagnosis, you’ll almost certainly pay out of pocket.
What CGMs Cost Without Insurance
Without coverage, CGM costs add up quickly. Dexcom G6 or G7 systems run $450 or more per month at retail price for sensors alone, plus a one-time receiver cost. The FreeStyle Libre systems are less expensive, running roughly $2,000 per year at full price. Discount programs bring costs down: with GoodRx coupons, FreeStyle Libre 3 sensors cost about $150 per pair (a month’s supply), putting the annual total around $1,950. Dexcom G7 sensors drop to about $185 for a 30-day supply with coupons, and the receiver falls to around $85. These prices fluctuate, but the gap between insured and uninsured costs is substantial enough to make coverage worth pursuing.
What to Do if Your Claim Is Denied
Insurance denials for CGMs are common, but they’re not the final word. The appeals process typically has up to three levels, and knowing how to navigate it improves your chances significantly.
Start by identifying exactly why you were denied. Review the Explanation of Benefits document or call member services with your plan number, member number, and claim number ready. The reason matters because it tells you what documentation is missing or what criteria you didn’t meet.
For the first-level appeal, you or your doctor contact the insurer and ask them to reconsider. The most effective approach is a letter of medical necessity from your doctor that includes your clinical history, lab results, how you’ve responded to current treatment, and references to clinical guidelines supporting CGM use. Your doctor can also request a peer-to-peer review, which is a phone conversation between your physician and a doctor at the insurance company. This direct conversation often resolves disputes that paperwork alone can’t.
If the first appeal fails, the second level is reviewed by a medical director at the insurance company who wasn’t involved in the original decision. Beyond that, you can request an independent external review, where a third-party reviewer and a specialist in your doctor’s field evaluate the case. Check your plan’s specific deadlines for each stage. Missing a filing deadline is automatic grounds for denial, regardless of the strength of your case.