How can one get a health insurance company to pay for a back inversion table?

The insurance company says that a back inversion table is experimental, therefore, not covered. How can one get a device paid by the insurance company that would benefit the insured? The inversion table would expand the spine, allowing blood and other fluid to flow more freely.
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The table sounds good, but the problem is that : 1 - insurance companies pay for as little as possible 2 - there is little evidence to show a benefit to the table.
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