| Covered Models | FreeStyle Libre 2, FreeStyle Libre 3 |
| Medicare Part | Part B (DME) |
| Patient Coinsurance | ~20% after deductible |
| 2026 Part B Deductible | $257 |
| HCPCS Code (Sensor) | A4239 |
| Sensor Wear Duration | 14β15 days |
| Prescription Required | Yes β face-to-face order |
| CGM Classification | Therapeutic CGM (tCGM) |
Key Takeaways
- Medicare covers FreeStyle Libre 2 and Libre 3 as Therapeutic CGMs (tCGM) in 2026
- Patients must use insulin or be at risk of hypoglycemia to qualify
- Coverage falls under Medicare Part B at 80% after deductible
- A valid prescription and face-to-face physician order are required
- Sensors are billed under HCPCS code A4239
Medicare Coverage Overview
In 2026, Medicare covers the FreeStyle Libre system under Part B as a durable medical equipment (DME) benefit. Following CMS policy expansions, FreeStyle Libre 2 and FreeStyle Libre 3 qualify as Therapeutic Continuous Glucose Monitors, meaning readings can be used directly for treatment decisions without fingerstick confirmation.
Eligibility Requirements
Who Qualifies
- Diagnosed with diabetes mellitus (Type 1 or Type 2)
- Treated with insulin (multiple daily injections or insulin pump) OR at risk for hypoglycemia
- Order placed by a treating physician after a face-to-face or telehealth encounter within 6 months
- Enrolled in Medicare Part B
Documentation Needed
- Written prescription from a Medicare-enrolled physician
- Medical records confirming diabetes diagnosis and insulin use or hypoglycemia risk
- Certificate of Medical Necessity (CMN) in some cases
Coverage Details and Costs
| Item | Details |
|---|---|
| Covered System | FreeStyle Libre 2, FreeStyle Libre 3 |
| Medicare Part | Part B (DME) |
| Medicare Pays | 80% after deductible |
| Patient Pays | ~20% coinsurance |
| HCPCS Code (Sensor) | A4239 |
| Sensor Wear Time | 14 days (Libre 2), up to 15 days (Libre 3) |
The 2026 Part B deductible is $257. After meeting the deductible, Medicare covers 80% of the approved amount. If you have a Medicare Supplement (Medigap) plan, your out-of-pocket costs may be further reduced.
FreeStyle Libre 2 vs. Libre 3 Under Medicare
Both systems are Medicare-covered in 2026. The Libre 3 offers a smaller, one-piece sensor and real-time continuous readings sent directly to a smartphone every minute. The Libre 2 uses an on-demand scan model with optional alarms. Clinically, both meet Medicare's tCGM criteria. Availability of the Libre 3 under your specific Medicare plan may vary by supplier.
How to Get FreeStyle Libre Through Medicare
- Confirm eligibility with your endocrinologist or primary care physician
- Obtain a written prescription and face-to-face order documentation
- Choose a Medicare-approved DME supplier
- Supplier verifies benefits and submits claim to Medicare
- Receive sensors monthly β typically a 1-month supply at a time
Tips to Reduce Out-of-Pocket Costs
- Use a Medicare Advantage (Part C) plan that may offer enhanced CGM benefits
- Apply for Abbott's patient assistance programs if cost-sharing is a burden
- Compare DME suppliers β pricing on the 20% coinsurance can vary
- Check if your Medigap plan covers Part B coinsurance
MDS Diabetes offers Medicare-compatible FreeStyle Libre sensors and can help verify your coverage. Browse our CGM sensor selection and speak with our team about Medicare billing support.