Last reviewed August 20, 2026 by the Medically Modern coverage team. Timelines depend on your plan and prescriber — treat these as typical rather than guaranteed.
A Dexcom G7® is prescription-only in the US, so every route starts with a prescriber. From there the path forks depending on whether insurance is paying and which benefit it uses. These four steps cover both.
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Step 1: Get a qualifying visit and a prescription
Talk to the clinician who manages your diabetes. Bring specifics: your insulin regimen if you use one, how often you test, and what your low blood sugars look like — including whether anyone has ever had to help you through one. Those details decide whether you meet payer criteria, and they need to be in the chart, not just in the conversation.
If you are on Medicare, this visit is not optional paperwork: Medicare requires an in-person or approved telehealth visit with your treating practitioner within the six months before the order. Ask the office to document that it addressed your diabetes control.
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Step 2: Find out what your plan actually covers
Before anyone orders anything, establish two things: whether your plan covers CGMs, and which benefit it runs them through. Plans use either the pharmacy benefit (usually a flat copay) or the medical/DME benefit (usually coinsurance after the deductible), and the same sensors can cost very different amounts through the two lanes.
You can call the number on your insurance card and ask about your CGM benefit yourself. Or submit a benefits check and we will do it — we contact your insurer, confirm whether the G7 is covered and under which benefit, and tell you the dollar amount before you commit to anything.
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Step 3: Clear prior authorization, if your plan needs it
Prior authorization is a request your prescriber submits asking the plan to approve the G7 before it is dispensed. It is routine — and it is where most orders stall, usually because it was never submitted or went in without the documentation the plan wanted.
Turnaround is often a few business days. If it comes back denied, read the specific reason before reacting: most first denials are procedural (missing notes, wrong benefit, quantity limit) rather than final, and the fix is usually straightforward.
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Step 4: Set up delivery and calendar the follow-up
Once approved, sensors ship from a pharmacy or a DME supplier depending on your benefit. Ask about supply size — a 90-day fill means fewer reorder cycles to miss.
Then do the thing almost everyone forgets: put the six-month follow-up visit in your calendar now. On Medicare, coverage continues only if your treating practitioner sees you every six months and documents adherence. Supply lapses caused by a missed appointment are the most avoidable problem in this whole process.
We do steps 2 through 4 for you
Benefits verification, prior authorization with your prescriber, and delivery with refill reminders.
How long it takes
| Situation | Typical timeline |
|---|---|
| Prescription in hand, no prior authorization needed | About a week to first delivery |
| Prior authorization required | Add several business days for the plan's decision |
| Need a qualifying office visit first | The appointment sets the timeline |
| First denial that needs documentation | Add one to three weeks depending on how fast notes are supplied |
If you are paying cash instead
You still need a prescription, but steps 2 and 3 disappear. Take the prescription to a pharmacy and compare Dexcom's own coupon against GoodRx and SingleCare prices on the day you fill — the cheapest option changes by pharmacy and ZIP code. Expect roughly $180–$320 a month; the cash price guide has the detail.
Three things that go wrong most often
- The visit that never got documented. It happened, but the note does not tie to diabetes control, so the payer does not count it.
- Prior authorization in limbo. Nobody has the reference number and everyone assumes someone else is chasing it. Ask for the number when it is submitted.
- Sensors billed through the wrong lane. The claim goes through and you are charged far more than you should be. Price both benefits before the first fill, not after.
Frequently asked questions
Can my primary care doctor prescribe a G7, or do I need an endocrinologist?
A primary care clinician can prescribe one. What matters to payers is that the prescriber is a treating practitioner managing your diabetes and that the documentation supports the criteria — not the specialty on the letterhead.
Can I use telehealth?
Often yes. Medicare accepts an approved telehealth visit for both the initial and the six-month visits. Commercial plans vary. Confirm with the plan before relying on it.
What if I run out of sensors while waiting?
Tell your prescriber's office — a gap in CGM data matters clinically, not just administratively. If you are between approvals, compare cash prices for a single fill rather than going without, and ask whether a sample is available.
What to ask your prescriber
The appointment is where most of the outcome is decided, so it is worth arriving with questions rather than hoping the topic comes up:
- “Do you think a CGM is appropriate for me, and would you prescribe one?”
- “Can you document my insulin regimen and any low blood sugar episodes with dates and glucose values?” This is the documentation payers read.
- “Should the prescription be for the standard G7 or the G7 15 Day?” The 15-day sensor is for adults 18 and over.
- “Can you write it for a 90-day supply?” Fewer reorder cycles, and cheaper if you end up paying cash.
- “Who submits prior authorization if my plan needs it, and can I get the reference number?”
Choosing between a pharmacy and a supplier
Once you know which benefit your plan uses, the practical differences matter:
| Retail pharmacy | DME supplier | |
|---|---|---|
| Getting started | Walk in with a prescription | Supplier verifies benefits and coordinates with your prescriber first |
| Refills | You initiate each one | Usually proactive, with reminders and scheduled shipments |
| Paperwork | Yours to chase | Handled by the supplier, including prior authorization |
| Medicare | Not the Part B route for CGMs | Required — Medicare covers CGMs as durable medical equipment |
Neither is universally better. If your plan gives you a low flat pharmacy copay and you do not mind managing refills, a pharmacy is simple. If you are on Medicare, or your plan runs CGMs through the medical benefit, or you would rather not chase authorizations, a supplier is the path.
What to do while you wait
- Keep testing as you normally would. Do not change your monitoring routine because a CGM is coming.
- Ask whether a sample is available. Some prescribers can provide one to bridge a gap.
- Check the free trial if you are commercially insured and new to Dexcom. It excludes Medicare, Medicaid and VA beneficiaries — see the savings page for full eligibility.
- Confirm your phone is compatible before delivery, so you are not troubleshooting on day one.
Keeping supply going once it starts
Getting the first shipment is the hard part. Losing supply later is usually one of three avoidable things:
The six-month visit
On Medicare this is a coverage requirement, not a suggestion. Book the next one before you leave the current one.
A lapsed prior authorization
Authorizations expire. Ask when yours does and put that date in the calendar too.
A plan year change
Formularies, deductibles and preferred suppliers reset in January. A product covered in December is not automatically covered in January, and your cost almost certainly changes when the new deductible starts.
If a sensor fails early, contact Dexcom about its replacement policy rather than burning a plan-covered fill. Roughly a quarter of G7 15 Day sensors did not reach the full 15 days in the clearance study, so this is not a rare event.
Switching suppliers or pharmacies
You are not locked in. If your supplier is slow, unreachable, or billing you unexpectedly, you can move — you will need the prescription transferred and, on Medicare, the new supplier must be enrolled and accept assignment. Ask any new supplier two questions before switching: whether they accept your specific plan, and what your expected monthly cost will be with them. A supplier that will not answer the second question before you commit is telling you something.
Sources: CMS LCD L33822, CMS Policy Article A52464, Noridian DME — Glucose Monitors, Dexcom cost & coverage.