Home Continuous Glucose Monitors on Medicare — Dexcom and Libre for Beginners That Talk to Your Phone
Published October 2026 · Last verified October 2026
A continuous glucose monitor, or CGM, is a small sensor you wear on your arm that reads your blood sugar all day and night and sends the number to your phone — no finger sticks every time. This guide is about the prescription kind that Medicare helps pay for: who qualifies, how to get one through a supplier, what it costs, and how to put one on and read it. It is not about the drugstore kind you buy without a prescription — that's a different guide.
A continuous glucose monitor, or CGM, is a small sensor you wear on your arm that reads your blood sugar all day and night and sends the number to your phone — no finger sticks every time. This guide is about the prescription kind that Medicare helps pay for: who qualifies, how to get one through a supplier, what it costs, and how to put one on and read it. It is not about the drugstore kind you buy without a prescription — that's a different guide.
What's inside this guide
The printable PDF walks through 37 short chapters, in plain language. It also includes an everyday cheat sheet and at-a-glance pictures.
- What a Continuous Glucose Monitor Is
- The Pieces: Sensor, Transmitter, and Phone
- How It Reads Without Drawing Blood
- The Prescription Path vs. the Drugstore Kind
- Who Medicare Part B Covers in 2026
- Why a Diabetes Diagnosis Alone Isn't Enough
- The Doctor Visit Within Six Months
- The Training Step — and Why It Helps
- Getting One Through a Supplier or Pharmacy
- What It Costs You
- The Covered Systems You'll Hear About
- Confirm Your Exact Model Before You Rely on It
- Applying a Sensor, Step by Step
- Picking a Good Spot and Prepping the Skin
- The Warm-Up Wait After You Apply
- The Phone App Basics
- If You'd Rather Not Use a Phone
- The Alarms and What They're For
- Your Targets Are the Doctor's to Set
- Do You Still Need Finger Sticks?
- Showering, Sleeping, and Everyday Wear
- Keeping a Sensor Stuck for Its Full Life
- Changing Sensors and Keeping Supplies Coming
- Letting Family See Your Numbers
- Sharing Reports With Your Care Team
- Who Can See Your Numbers
- Traveling With a CGM
- When the App Shows No Reading
- Common Mistakes, and How to Dodge Them
- Watch Out for the "Free CGM" Call
- Common Worries, Answered
- A Note for the Family Helper
- A Few Myths, Cleared Up
- A Day in the Life
- When to Call the Doctor — or 911
- What the First Week Looks Like
- You Don't Have to Do This Alone
Get the printable guide
Everything above is a quick summary. The full, printable guide — the same words, laid out to read and keep by the computer — is a free PDF.
Last verified October 2026. Information accurate as of October 25, 2026.
Want the monitor set up right the first time?
I'll measure your arm for cuff size, help you pick a validated model, set up the monitor and the app, connect MyChart or Apple Health if your clinic supports it, and practice one reading and one PDF export with you. Flat $99, 30-day follow-up included. Serving Portage County.
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Any prices or outside products mentioned in this guide can change over time — the details here were last checked August 2026 and this page is accurate as of October 18, 2026; please confirm current pricing before you buy. See how often we review our guides →