I did a Google search:
"Medicare doesn't cover hearing aids or exams for fitting hearing aids. You pay 100% for hearing aids and exams. Some Medicare Advantage Plans (Part C) offer extra benefits that Original Medicare doesn't cover - like vision, hearing, or dental. Contact the plan for more information."
Humana has added hearing aid coverage on some plans, but the brand (TruHearing) doesn't get very high marks.
I have ReSound hearing aids that I bought myself. Yup, think expensive, but they work! I can click an option that eliminates most noise from behind.