leaching. Phosphate leached from guano phosphatizes the underlying rocks in some areas, forming apatite where the host rock is limestone and forming aluminum- or aluminum-iron-phosphate minerals where the underlying rock is a silicate. Individual deposits of both igneous apatite and marine phosÂ­
Medicare Part B (Medical Insurance) covers diagnostic hearing and balance exams if your doctor or other health care provider orders these tests to see if you need medical treatment. Medicare doesn't cover routine hearing exams, hearing aids, or exams for fitting hearing aids.
The first will pay up to the limits of its coverage and then the second will pay beyond that point. If you have questions about Medicare or other insurance coverage, find a hearing healthcare professional in your area to help you find answers about hearing healthcare and hearing aids.tems not covered by Medicare (includes hearing aids). Before getting Medicare, it is also important to note what is not covered by either plan. If you need any of the services not covered by Medicare, you will have to use other insurance or pay for them in full.