When you go into a hospital wearing a diaper then they will also have diapers you can wear.
However the hospital does not make you wear diapers.
Also the diapers that the hospitals have for patients are very poor quality diapers that fall apart and leak really easily.
I went into the hospital sick and had a wet diaper on and they wanted to put a catheter into me which I refused and so they brought out a diaper and it was terrible.
Still the diaper was much better than the catheter would be.
The only people that the hospital would make wear diapers is an incontinent kid or a toddler or baby who is not potty trained.
The hospital uses Pampers diapers mostly for toddlers and babies but for adults they have terrible medical grade diapers.
You can also bring your own better quality diapers into the hospital if you want to or need to wear diapers but the hospital won't make you wear them.
You can wear them if you want too though.