Medicare Pays 80% for CGMs: Six Month Rules for Central Oregon

Yes, Medicare Part B covers continuous glucose monitors and related supplies as durable medical equipment when three conditions line up: your prescriber documents qualifying clinical criteria, you have an order that meets Medicare’s coverage rules, and your supplier participates in Medicare.

TL;DR:

• Medicare covers continuous glucose monitors when the patient has a diabetes diagnosis, uses insulin or has hypoglycemia, and completes a qualifying evaluation within six months.
• Devices must be listed on the PDAC Product Classification List, and coverage depends on the device being classified as durable medical equipment with necessary technical features.
• Beneficiaries typically pay 20% of the Medicare-approved amount after meeting their Part B deductible, with costs varying by supplier participation and supply cycle limits.
• Maintaining ongoing coverage requires a follow-up evaluation every six months to verify continued device use and medical necessity.
• Medicare Advantage plans may impose additional restrictions, requiring prior authorization or limiting in-network suppliers, so beneficiaries should verify coverage details before ordering.

Table of Contents

• What Medicare covers and who qualifies for a CGM
• How to get a CGM on Medicare: a step-by-step checklist
• Costs, billing, and coding: what Medicare pays and what you may owe
• Device types and technical rules that affect coverage
• Continued coverage and monitoring: follow-up visits and appeals
• How Medicare Advantage (Part C) plans may differ
• Local perspective: getting straight answers in Central Oregon
• Get help confirming your CGM coverage
• FAQ
• Sources

What Medicare covers and who qualifies for a CGM

Medicare’s coverage rules for continuous glucose monitors come from a Local Coverage Determination that spells out exactly who qualifies and what a clinician has to document before your device gets approved. The CMS LCD for glucose monitors requires several things to happen before a CGM claim gets paid.

• You have a diagnosis of diabetes documented in your medical record.
• Your treating practitioner confirms you (or a caregiver) can use the device, read results, and respond appropriately.
• The device is prescribed consistent with its FDA-cleared indications for use.
• You are treated with insulin or have documented problematic hypoglycemia that meets the clinical threshold.
• You complete an in-person or Medicare-approved telehealth visit with your prescriber within six months before the order.

CMS treats both non-adjunctive (therapeutic) CGMs, which beneficiaries use to make treatment decisions on their own, and adjunctive CGMs, which supplement finger stick testing, as durable medical equipment once these criteria are met. Implantable CGMs fall under a related LCD with similar beneficiary requirements and the same six-month follow-up expectation, reflecting how closely CMS ties ongoing coverage to proof that the device is still medically necessary.

How to get a CGM on Medicare: a step-by-step checklist

Getting from “I think I need a CGM” to a working device on your arm or abdomen involves a short list of concrete steps, and skipping any one of them is the most common reason claims get denied.

1. Schedule the required evaluation visit with your prescriber, in person or via Medicare-approved telehealth, and confirm it happens within six months of your order date.
2. Ask your prescriber to document your diagnosis, insulin use or hypoglycemia history, and your ability (or a caregiver’s ability) to operate the device and act on its readings.
3. Confirm your DME supplier is enrolled in Medicare and accepts assignment, which keeps your out-of-pocket costs predictable.
4. Verify the specific CGM model is listed on the PDAC Product Classification List under the correct billing code before you place an order.
5. Ask the supplier how many sensors or transmitters are included in a standard supply cycle so you know what to expect on future claims.

Training evidence can come from your prescriber’s office, a diabetes educator, or a caregiver training session, but it needs to be written down somewhere in your chart, not just discussed verbally.

Pro Tip: Call your DME supplier before your evaluation visit, not after, so you know which device models they actually stock and can tell your prescriber which one to order.

Costs, billing, and coding: what Medicare pays and what you may owe

Once your CGM order is approved, Medicare pays its share through the same Part B framework used for other durable medical equipment, and the coding behind the scenes matters more than most beneficiaries expect.

• After you meet your annual Part B deductible, you typically pay 20% of the Medicare-approved amount when your supplier accepts assignment.
• Choosing a non-participating supplier can mean paying more out of pocket, since that supplier is not bound to the Medicare-approved amount.
• CGM receivers and transmitters are billed under codes like E2102 or E2103, with supplies such as sensors billed under codes like A4238 or A4239, and every device billed under these codes must appear on the PDAC Product Classification List.
• Medicare limits how many units of service it will pay for in a 90-day window, so ordering too many sensors too quickly can trigger a partial denial.

Device types and technical rules that affect coverage

Not every glucose monitoring setup qualifies as durable medical equipment, and the technical details of your device matter as much as your diagnosis.

• A durable receiver or integration with an insulin pump is generally required; a setup that only displays readings on a smartphone app may not meet Medicare’s DME definition.
• Supply allowances differ slightly between adjunctive and non-adjunctive devices, which affects what Medicare bundles into a standard supply order.
• Checking the PDAC Product Classification List before you order protects you from a denial that traces back to the device itself rather than your eligibility.

Devices billed under CGM-specific codes must be listed on the Product Classification List for that code, or the claim can be denied outright, according to CMS coverage guidance. This single verification step prevents a surprising number of avoidable denials.

Continued coverage and monitoring: follow-up visits and appeals

Getting your first CGM approved is only half the process. Keeping it covered depends on ongoing proof that the device is still helping you manage your diabetes.

• Medicare requires a follow-up visit, in person or via Medicare-approved telehealth, roughly every six months to document that you are still using the device and that it remains medically necessary.
• Your prescriber should keep notes on your adherence and outcomes, and you should keep copies of your own supply receipts and orders.
• If a claim or supply allowance is denied, you can appeal through Medicare’s standard redetermination process, starting with a written request to your Medicare Administrative Contractor within 120 days of the denial notice.

How Medicare Advantage (Part C) plans may differ

If you are enrolled in a Medicare Advantage plan rather than Original Medicare, your CGM coverage rules may not match what applies under Part B directly, and it pays to check before you order anything.

• Medicare Advantage plans can require prior authorization, limit coverage to specific in-network DME suppliers, or apply different cost-sharing than Original Medicare.
• Before ordering, ask your plan whether the specific device is covered, which suppliers are in-network, and whether prior authorization is required.
• If your area has limited in-network DME suppliers under your Advantage plan, it is worth comparing what Original Medicare with a Medigap policy would cost for the same device.

Local perspective: getting straight answers in Central Oregon

We built Mountain Top Insurance in Bend, Oregon, around one idea: Medicare questions deserve plain answers, not a sales pitch. When a client calls asking whether their CGM qualifies, we walk through the actual LCD criteria with them, so they understand their own coverage before they order anything.

— Jesse Zimmerman

Get help confirming your CGM coverage

Figuring out whether your diagnosis, prescription, and supplier all line up with Medicare’s rules is confusing enough without doing it alone. We offer free Medicare guidance for Central Oregon residents working through exactly this kind of coverage question, and we can help you check supplier assignment, documentation gaps, and plan-specific rules before you place an order.

• We walk through your eligibility and documentation needs so your CGM order has a clean path through Medicare.
• Our enrollment assistance service helps you confirm supplier participation and assignment status.
• Our annual plan reviews catch coverage or cost-sharing changes before they catch you off guard.

If you want a second set of eyes on your Medicare or Medicare Advantage coverage before your next CGM order, reach out for a consultation.

This article is general information, not a substitute for advice from a qualified doctor. Consult a qualified healthcare professional about your own circumstances before acting on anything here.

FAQ

What are the six things Medicare doesn’t cover?

Original Medicare generally does not cover routine dental care, most vision and hearing aids, long-term custodial care, cosmetic surgery, acupuncture outside limited cases, and care received outside the United States in most situations. Some of these gaps, like dental and vision, can be addressed through supplemental coverage outside of Original Medicare.

What is a continuous glucose monitoring device?

A continuous glucose monitor is a wearable sensor that tracks glucose levels throughout the day and night, sending readings to a receiver, insulin pump, or compatible smartphone app. Medicare classifies qualifying CGMs as durable medical equipment under Part B.

Do diabetics get free blood glucose monitors through Medicare?

Medicare does not provide blood glucose monitors or CGMs entirely free of charge under Original Medicare. After you meet your Part B deductible, you typically pay 20% of the Medicare-approved amount when your supplier accepts assignment.

How do I get a CGM through Medicare?

You need a prescriber evaluation documenting your diabetes diagnosis, insulin use or problematic hypoglycemia, and training ability, completed within six months of your order. From there, a Medicare-enrolled supplier with the device listed on the PDAC Product Classification List handles the order and billing.

Does Medicare require follow-up visits to keep CGM coverage?

Yes, Medicare requires a follow-up visit roughly every six months, in person or through approved telehealth, to confirm you are still using the device and that it remains medically necessary. Missing this visit can put your continued supply coverage at risk.

Sources

• Medicare
• CMS — LCD: Glucose Monitors (L33822)

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Disclaimer: This article is for general educational purposes only and does not constitute personalized advice. Medicare rules and plan details change frequently.