This is an interesting bill under consideration now in Congress in the U.S. It would prohibit Medicare from requiring “prior authorization” before wheelchair repair.

https://www.congress.gov/bill/119th-congress/house-bill/9364/text

Currently, as I understand it, if your wheelchair breaks and it is covered under Medicare plan that is run by a private insurance company, that company can require you to go through their approval process to get any sort of repair or replacement.