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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 say     FDG PET Requirements for Coverage in the Differential Diagnosis of AD and FTD 
 
    An FDG PET scan is considered reasonable and necessary in patients with a recent diagnosis of dementia 
and documented cognitive decline of at least 6 months, who meet diagnostic criteria for both AD and FTD. 
These patients have been evaluated for specific alternate neurodegenerative diseases or other causative factors, 
but the cause of the clinical symptoms remains uncertain. 
 
    The following additional conditions must be met before an FDG PET scan will be covered: 
 
        The patients onset, clinical presentation, or course of cognitive impairment is such that FTD is suspected 
as an alternative neurodegenerative cause of the cognitive decline. Specifically, symptoms such as social 
disinhibition, awkwardness, difficulties with language, or loss of executive function are more prominent early 
in the course of FTD than the memory loss typical of AD; 
 
        The patient has had a comprehensive clinical evaluation (as defined by the American Academy of 
Neurology encompassing a medical history from the patient and a well-acquainted informant (including 
assessment of activities of daily living), physical and mental status examination (including formal 
documentation of cognitive decline occurring over at least 6 months) aided by cognitive scales or 
neuropsychological testing, laboratory tests, and structural imaging such as magnetic resonance imaging (MRI) 
or computed tomography (CT); 
 
        The evaluation of the patient has been conducted by a physician experienced in the diagnosis and 
assessment of dementia; 
 
        The evaluation of the patient did not clearly determine a specific neurodegenerative disease or other cause 
for the clinical symptoms, and information available through FDG PET is reasonably expected to help clarify 
the diagnosis between FTD and AD and help guide future treatment; 
 
        The FDG PET scan is performed in a facility that has all the accreditation necessary to operate nuclear 
medicine equipment. The reading of the scan should be done by an expert in nuclear medicine, radiology, 
neurology, or psychiatry, with experience interpreting such scans in the presence of dementia; 
         A brain single photon emission computed tomography (SPECT) or FDG PET scan has not been obtained 
for the same indication. (The indication can be considered to be different in patients who exhibit important 
changes in scope or severity of cognitive decline, and meet all other qualifying criteria listed above and below 
(including the judgment that the likely diagnosis remains uncertain.) The results of a prior SPECT or FDG PET 
scan must have been inconclusive or, in the case of SPECT, difficult to interpret due to immature or inadequate 
technology. In these instances, an FDG PET scan may be covered after one year has passed from the time the 
first SPECT or FDG PET scan was performed.)  
 
You can find this information in Medicare's National Coverage Determination (NCD): FDG PET for Dementia 
and Neurodegenerative Diseases (220.6.13). 
 
If you want to read these Medicare rules, you can go to this website www.medicareappeal.com.