How to Get a Continuous Glucose Monitor Covered by Medicare

Continuous glucose monitors have changed how people with diabetes manage their condition — no more finger-sticking every few hours, just real-time blood sugar data delivered automatically. Medicare does cover CGMs, but getting that coverage approved requires meeting specific eligibility criteria and navigating a process that trips up a lot of people. Here's what you need to know before you start.

What Medicare Considers a CGM

Medicare classifies continuous glucose monitors as durable medical equipment (DME), which means coverage falls under Part B rather than Part D (the prescription drug benefit). This distinction matters because it affects how you get the device, where you can obtain it, and what you'll pay.

There are two categories of CGMs under Medicare:

• Therapeutic CGMs — devices whose readings you can use to make treatment decisions (like adjusting insulin) without confirming with a finger-stick test. These receive the most complete Medicare coverage.
• Non-therapeutic (adjunctive) CGMs — older classification for devices that required finger-stick confirmation. Medicare's coverage rules have evolved here, so the category your specific device falls into affects your benefits.

Most modern CGMs qualify as therapeutic, but confirming your device's classification with your supplier or prescribing physician is a necessary first step.

Who Qualifies for Medicare CGM Coverage 🩺

Medicare has established eligibility requirements for CGM coverage. While program rules can be updated, the general qualifying factors have centered on:

Diabetes diagnosis — You must have a documented diagnosis of diabetes (Type 1 or Type 2).

Insulin use or intensive management — Historically, Medicare required that beneficiaries use insulin. Policy changes in recent years have broadened access somewhat, so the exact insulin-use requirement depends on current program guidelines and the specific device being prescribed. Your physician's documentation of your treatment plan is critical here.

Treating physician involvement — Medicare requires that a physician or qualified non-physician practitioner (such as a nurse practitioner or physician assistant) who manages your diabetes must prescribe the CGM and be actively involved in your care — not a consulting or specialist-only relationship.

Face-to-face evaluation — You typically need a documented in-person (or, in some cases, qualified telehealth) visit with your treating physician demonstrating that CGM use is medically necessary for your care.

What determines whether a specific person qualifies is a combination of their diagnosis, treatment regimen, physician documentation, and whether all administrative requirements are met. Meeting most — but not all — of these requirements can still result in a denial.

The Step-by-Step Process for Getting Coverage

1. Start With Your Treating Physician

Your prescribing doctor must document medical necessity in a way that satisfies Medicare's requirements. This typically includes:

• Your diabetes diagnosis and treatment history
• Your current medication regimen
• Why a CGM is appropriate for your care
• A prescription written specifically to Medicare's documentation standards

Incomplete documentation is one of the most common reasons CGM claims are denied. Ask your physician whether their practice is familiar with Medicare's DME documentation requirements — not all are.

2. Use a Medicare-Enrolled DME Supplier

You cannot use just any pharmacy or medical supplier. The CGM and its supplies must come from a Medicare-enrolled Durable Medical Equipment supplier. If your supplier isn't enrolled in Medicare, the claim will be denied regardless of your eligibility.

You can verify a supplier's Medicare enrollment through Medicare's online supplier directory or by calling 1-800-MEDICARE.

3. Understand What's Actually Covered

Under Part B, Medicare generally covers:

• The CGM receiver or reader
• Sensors (on an ongoing supply basis)
• Transmitters (where applicable)

What Medicare does not cover: Smartwatch or smartphone display features on some devices may not be included in coverage. Supplies beyond the covered quantity require out-of-pocket payment.

4. Know Your Cost-Sharing

As a Part B benefit, the standard Medicare structure applies: after your Part B deductible, Medicare typically pays a percentage of the approved amount and you pay the remainder. Your actual out-of-pocket cost depends on whether you have a Medicare Supplement (Medigap) policy, a Medicare Advantage plan, or Original Medicare only.

Medicare Advantage plans may have different coverage rules, prior authorization requirements, and cost structures — check your specific plan's formulary and DME benefits.

Common Reasons CGM Coverage Gets Denied ⚠️

Understanding why claims fail helps you avoid the same pitfalls:

If you receive a denial, you have the right to appeal. The Medicare appeals process has multiple levels, and a significant number of denials are overturned on appeal — particularly when documentation gaps are corrected.

Medicare Advantage vs. Original Medicare

If you're enrolled in a Medicare Advantage (Part C) plan, your CGM coverage runs through that plan rather than Original Medicare. Advantage plans must cover at least what Original Medicare covers, but they can impose additional requirements like:

• Prior authorization before you receive the device
• Preferred supplier networks — you may need to use a specific supplier
• Different cost-sharing structures

Always verify CGM coverage directly with your Advantage plan before proceeding. What's covered under Original Medicare isn't automatically covered the same way under your Advantage plan.

What to Do If You're Not Sure You Qualify 🔍

The landscape here is more nuanced than a simple yes/no checklist. What you'd want to evaluate:

• Your current diagnosis and treatment regimen — and whether it meets current Medicare eligibility criteria
• Your physician's documentation practices — whether they're prepared to meet Medicare's requirements
• Your plan type — Original Medicare vs. Medicare Advantage, and what your specific plan covers
• The specific CGM being prescribed — not all devices are covered equally

A good starting point is a conversation with both your treating physician and a Medicare-enrolled DME supplier who works with CGMs regularly. Medicare's own helpline (1-800-MEDICARE) can also clarify current coverage rules and whether a specific device is on the approved list.

Medicare coverage rules for CGMs have evolved over the past several years and may continue to change — so confirming current requirements at the time you're seeking coverage is always the right move.