We Are/DigitalVision via Getty Images Envoy Medical (NASDAQ:COCH) is a hearing device company for people with moderate to severe hearing loss. It is the only company that offers an FDA approved active fully implantable device, the Esteem Active Middle Ear implant. This device has lacked commercial success due to its Medicaid classification as a hearing aid, which is not eligible for coverage. Private insurance companies typically follow Medicaid reimbursement policies. Few people are capable or willing  ...