If you require a cranial prosthesis due to medical-related hair loss, such as Alopecia, Trichotillomania, or Cancer-related therapy, you may be eligible for reimbursement under your health insurance. Most insurance companies will cover from 70% to 100% of the cost for a cranial prosthesis.
Check your insurance benefits section under "covered expense" relating to prosthesis, prosthetic devices, or durable medical equipment. Most companies don't specify exclusions, so the actual coverage should be looked into. This will help your case.