Authorized NYRx, Medicare & Medicaid DME Provider
CGM Frequently Asked Questions – Dexcom G7 & FreeStyle Libre 3 Plus,
NYC, New York State & Nationwide
Palma Care DME provides expert answers to the most common questions about continuous glucose monitors in 2026. Whether you're new to CGM setup, troubleshooting connectivity, checking Medicare or NYRx Medicaid coverage in New York, or wondering about sensor lifespan and accuracy, find clear, up-to-date guidance here. Our NYC-based team supports and shipping to patients across the five boroughs, statewide, and nationwide with up to 2-day fast delivery and full insurance coordination.
How long does CGM setup take?
Physical sensor application usually takes under 5 minutes for both Dexcom G7 and FreeStyle Libre 3 Plus. The warm-up period is 30 minutes for Dexcom G7 and 60 minutes for FreeStyle Libre 3 Plus before real-time readings begin in the app. No finger-stick calibration is required after warm-up.
Do I need a prescription for a CGM?
Yes, a valid prescription from your doctor is mandatory. Your physician can send it electronically via Parachute Health for fastest processing or fax it to Palma Care DME at +1-718-874-5874. We verify insurance, handle prior authorization if required, and arrange 2-day delivery throughout New York.
Can I shower, swim, or exercise while wearing a CGM?
Both systems are water-resistant. Dexcom G7 allows up to 30 minutes of continuous water exposure (suitable for showering and brief swimming). FreeStyle Libre 3 Plus is rated for up to 24 hours of water exposure. Pat the sensor dry gently afterward. Exercise is permitted, but protect the insertion site from direct impact or excessive friction.
What if my CGM sensor falls off early or fails before the wear period ends?
Contact Palma Care DME right away at +1-718-437-3200 or via email. Provide your details and, if possible, a photo of the site. Under Medicare Part B and NYRx Medicaid, we ship a replacement sensor at no extra cost, typically within 1–2 business days in NYC and upstate New York.
How accurate are Dexcom G7 and FreeStyle Libre 3 Plus compared to finger-stick testing?
Both devices offer excellent accuracy with MARD values typically 8–9%, often outperforming many finger-stick meters. They do not require routine calibration. Minor variations may occur during the first 24 hours while the sensor stabilizes. If readings seem inconsistent after stabilization, compare with a finger-stick meter and contact us for support.
Does Medicare Part B cover CGM in 2026?
Yes. Medicare Part B covers Dexcom G7 and FreeStyle Libre 3 Plus for eligible beneficiaries who use insulin or have a documented history of problematic hypoglycemia. Coverage includes sensors, transmitters (where applicable), and related supplies with no finger-stick requirement for dosing decisions.
Does NYRx Medicaid cover CGM supplies in New York in 2026?
Yes. NYRx, the New York State Medicaid Pharmacy Program, provides full coverage for Dexcom G7 and FreeStyle Libre 3 Plus sensors and supplies for qualifying members. Palma Care DME is an in-network supplier—we manage prior authorization, copay coordination, and automatic refills with statewide delivery.
How often do I replace my CGM sensor?
Dexcom G7 sensors last 10 days. FreeStyle Libre 3 Plus sensors last up to 15 days (officially approved wear time in 2026). We schedule automatic refills to prevent gaps in coverage. Replace on schedule to maintain optimal accuracy and minimize skin irritation.
Can children use Dexcom G7 or FreeStyle Libre 3 Plus?
Yes. Dexcom G7 is approved for ages 2 and older; FreeStyle Libre 3 Plus for ages 4 and older. Setup follows the same steps, and apps include sharing features so parents or caregivers can monitor readings remotely.
What should I do if I receive a low or high glucose alert?
Follow app instructions immediately. Treat lows with 15 grams of fast-acting carbohydrates and recheck in 15 minutes. For highs, consider insulin per your doctor's plan. Palma Care DME offers free education—call us if you need help interpreting trends.
Why might my CGM show no readings or signal loss?
Common causes include Bluetooth being off, phone out of range (>20–33 feet depending on model), low battery, or temporary interference. Restart Bluetooth, move closer, and reopen the app. If persistent, contact us for troubleshooting or replacement.
Is finger-stick testing still needed with a CGM?
No routine finger sticks are required for dosing decisions with Dexcom G7 or FreeStyle Libre 3 Plus. Use a meter only if symptoms do not match readings, during the warm-up period, or if the app instructs you to do so.
Can I wear my CGM during MRI, CT scan, or X-ray?
Remove the sensor before any imaging procedure (MRI, CT, diathermy, X-ray). Both systems are not safe during these scans. Reapply a new sensor afterward and contact us if replacement is needed.
How do I share my CGM data with family or caregivers?
Both Dexcom G7 and FreeStyle Libre 3 Plus apps support real-time sharing. Invite followers via the app—caregivers receive alerts on their phones for highs, lows, or rapid changes. Ideal for pediatric, elderly, or high-risk patients.
What is the warm-up period and why does it matter?
Warm-up is the initial calibration phase: 30 minutes for Dexcom G7, 60 minutes for FreeStyle Libre 3 Plus. No readings appear during this time. Accurate data begins afterward—avoid making treatment decisions based on incomplete information.
Can two phones receive CGM readings at the same time?
Yes. Primary pairing is to one smartphone, but secondary devices (via follower sharing or Dexcom Follow app) can receive real-time data and alerts simultaneously.
How do I clean the CGM insertion site?
Use an alcohol wipe before insertion and let it dry fully. After removal, gently clean the area with mild soap and water. Avoid harsh scrubbing to prevent irritation.
What skin preparation helps the sensor stay on longer?
Shave excessive hair, clean with alcohol, and let dry. Some patients use skin barrier wipes or medical tape overlays for extra adhesion, especially during exercise or hot weather.
Does insurance cover CGM sensor adhesive patches or overpatches?
Medicare Part B and NYRx Medicaid typically cover sensors and core supplies. Additional overpatches or adhesives may require separate billing—contact Palma Care DME to check eligibility and options.
How do I report a faulty sensor to Palma Care DME?
Call +1-718-437-3200 or email support at intake@palmacaredme.com with your name, date of birth, sensor serial number, and issue description (plus photo if possible). We process replacements quickly under your coverage plan.
Can I travel with my CGM supplies?
Yes. Carry extra sensors, keep them in carry-on luggage, and bring your prescription. Both systems are TSA-approved. Palma Care DME can provide travel letters confirming medical necessity.