Oh my, I apologize. I wrote you a long answer yesterday, only to have my computer shut down before I could push "Reply"

Please know - if prescribed by a doctor, Medicare Part B covers nebulizer, Albuterol & saline. If your husband has Medicare Part B or an "umbrella" Advantage Plan or a supplement, IT IS COVERED. Two things often happen - pharmacists submit it under Part D (prescription drugs) - which is incorrect, and it gets rejected. Or, the wrong diagnostic and dispensing codes were used.

Here is the official 2022 information from the government:
https://www.cms.gov/medicare-coverage-database/view/article.aspx?articleId=52466#
Feel free to share this with your care team.
Sue