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The rules say that plans must pay for a medical service or item if regular Medicare would pay for it in this case. 
You can find this rule at 42 Code of Federal Regulations (CFR) Section 422.101. 
 
The rules state that therapeutic continuous glucose monitors (CGMs) and related supplies are covered by 
Medicare when all of the following coverage criteria are met: 
 
  1. The beneficiary has diabetes mellitus, 
  2. The beneficiary is insulin-treated with multiple (three or more) daily administrations of insulin or a 
Medicare-covered continuous subcutaneous insulin infusion (CSII) pump, 
  3. The beneficiarys insulin treatment regimen requires frequent adjustment by the beneficiary on the basis of 
BGM or CGM testing results, 
  4. Within six (6) months prior to ordering the CGM, the treating practitioner has an in-person visit with the 
beneficiary to evaluate their diabetes control and determined that criteria (1-3) above are met; and, 
  5. Every six (6) months following the initial prescription of the CGM, the treating practitioner has an in-
person visit with the beneficiary to assess adherence to their CGM regimen and diabetes treatment plan. 
 
You can find this information in the Centers for Medicare and Medicaid Services, Local Coverage 
Determination (LCD): Glucose Monitors (L33822). 
 
The rules say that MA plans may specify brands and manufacturers as preferred and charge lower cost-sharing 
for the preferred brands or may limit the DME to only those preferred brands and manufacturers, as long as the 
following conditions are met (42 CFR 422.100(l)): 
 
1. The MA plan provides all categories of DME covered under original Medicare Part B; 
2. The MA plan ensures that enrollees have access to all medically necessary (including non-preferred) DME 
products or brands; 
3. The MA plans contracted suppliers provide access to all preferred DME brands; 
4. During an enrollees first year of enrollment in an MA plan, if the enrollee requests, the plan will provide a 
90-day transition period (commencing with the initial time of enrollment) during which the plan provides (and 
repairs, as applicable) non-preferred DME brands furnished in the previous year; 
5. Although the MA plan may add brands to its preferred formulary during the year, it may not remove any 
brands mid-year; 6. The MA plan treats denials of non-preferred DME products or brands as organization determinations; 
7. The MA plan discloses DME coverage limitations and appeal rights in the case of a denial of a nonpreferred 
DME product or brand with the EOC and ANOC and on its website; and 
8. The MA plan provides full coverage, without limitation on brand and manufacturer, to DME categories or 
subcategories annually determined by CMS to require full coverage. 
 
You can find this rule at the Centers for Medicare and Medicaid Services, Internet Only Manual, Publication 
100-16, Medicare Managed Care Manual, Chapter 4, Section 10.12.2. 
 
If you want to read these Medicare rules, you can go to this website www.medicareappeal.com. 
 
The Plan contract says that the Plan covers items and services in accordance with Medicare rules.