Why would CyberKnife treatment for a tumor not be covered by insurance?

Physicians continue to study new applications for the CyberKnife System either as a stand-alone therapy or in combination with other treatments to determine how it can be used most effectively.

Because every patient is unique, CyberKnife may be appropriate in the treatment of less common indications or when an unusual aspect of a tumor, tumor location or overall health status may preclude other treatments. In cases where insurance coverage is not available but the physician and patient think that the CyberKnife System may be the best option, an insurance appeal may be necessary.

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Why would CyberKnife treatment for a tumor not be covered by insurance?