| Medicare Coverage | Part B DME β 80% after copay |
| Prior Auth Timeline | 3β10 business days typical |
| Appeal Window | 30β60 days from denial |
| Appeal Success Rate | 40β60% with documentation |
| FSA/HSA Eligible | Yes β CGMs and supplies |
| Medicare Supplier Req. | Must be Medicare-enrolled DME supplier |
Key Takeaways
- Most major insurers cover CGMs for Type 1 and insulin-dependent Type 2 diabetes
- Prior authorization is almost always required β prepare documentation in advance
- Appeals succeed in 40β60% of cases when properly documented
- Medicare covers CGMs under Part B as durable medical equipment (DME)
- FSA/HSA funds can cover CGM costs not paid by insurance
Who Qualifies for Insurance-Covered CGMs
Insurance coverage for continuous glucose monitors has expanded significantly. Most private insurers and Medicare now cover CGMs if you meet specific clinical criteria. Common eligibility requirements include:
- Diagnosis of Type 1 or Type 2 diabetes
- Current insulin therapy (multiple daily injections or insulin pump)
- History of hypoglycemia unawareness or frequent low blood sugar episodes
- Documentation of need from a licensed prescriber
Medicare Coverage (Part B)
Medicare covers therapeutic CGMs under Part B as DME. You must be insulin-treated, have a face-to-face visit with your doctor within 6 months, and purchase from a Medicare-enrolled supplier. Covered devices include Dexcom G6/G7 and Abbott FreeStyle Libre 2/3.
Step-by-Step: Getting Your CGM Approved
Step 1 β Get a Prescription
Your endocrinologist or primary care physician must write a CGM prescription with supporting clinical notes. Ensure it includes your diagnosis code, insulin regimen, and medical necessity statement.
Step 2 β Submit Prior Authorization
Contact your insurer to confirm PA requirements. Your provider submits PA paperwork including clinical notes, A1C history, and hypoglycemia logs. Most decisions take 3β10 business days.
Step 3 β Appeal If Denied
If denied, request the denial reason in writing. Common grounds for appeal include medical necessity letters, peer-reviewed literature, and detailed hypoglycemia records. File a Level 1 internal appeal within 30β60 days of denial.
Coverage Comparison by Insurer Type
| Insurer Type | Typical Coverage | Key Requirement |
|---|---|---|
| Commercial/Private | 80β100% after deductible | Prior Authorization |
| Medicare Part B | 80% after 20% copay | Medicare-enrolled supplier |
| Medicaid | Varies by state | State formulary approval |
| VA Benefits | Full coverage | VA-prescribed only |
What to Do If Insurance Won't Cover Your CGM
If coverage is denied after appeals, several options remain available:
- FSA/HSA: Use pre-tax dollars to purchase CGMs and supplies
- Manufacturer programs: Dexcom and Abbott offer patient assistance programs
- MDS Diabetes: Shop competitively priced CGM supplies at mdsdiabetes.com including sensors, transmitters, and accessories
- Secondary insurance: Coordinate benefits if you carry dual coverage
Tips to Strengthen Your Prior Authorization
- Keep a 30-day glucose log showing hypoglycemic episodes
- Ask your doctor to document hypoglycemia unawareness explicitly
- Reference your most recent A1C and time-in-range data
- Cite ADA Standards of Care recommending CGM use