I agree with Dr. Burrington. Each insurance plan is different and it's recommended you or your provider call to get confirmation of the benefits. There are several Health Care Common Procedure Codes (HCPCS) that are designated for assistive devices which may be helpful when you phone your insurance company. See American Speech Language Hearing Association web page for complete code listing https://www.asha.org. In my experience, those few and far between policies that do have hearing aid benefits are limited to only new hearing aid purchases, not repairs or accessories. Best of luck.
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