Are these standard procedures every six months?

[curiousone]

I went for what I thought was a routine cleaning and x rays last month. I am diabetic and have a Medicare advantage HMO plan.
I just received a statement from my insurance company telling me of two procedures I had that are not covered, and that therefore the doctor might charge me $556.
The codes uncovered are DO350, and D1208.
The first one is described as " 2D oral/facial photographic image obtained intraorally or extraorally".
The second one is described as " Topical application of flouride- excluding varnish.

Are these procedures standard for a twice yearly dental visit, or are they something my dentist decided to add for some reason?
It is difficult to pay this amount every six months.
How are these different than a standard cleaning and x rays?
Could I successfully appeal these to my insurance company if doctor can provide me with an appeal notice of necessity to send to insurance?

 

[Dr M]

Fluoride treatment can be given as part of a normal check-up and cleaning. If your insurance does not cover this, mention this to the dentist/oral hygienist next time. They can leave that out.
Contact your medical insurance regarding the type of x-rays they cover. Some insurances only cover peri-apical x-rays and not a panoramic x-ray.