Medicaid typically won't cover the cost of a shower chair that is only used for showering or bathing.
However if you need a more advanced chair for showering or bathing then Medicaid might cover the cost of the shower chair.
Most times a shower chair will usually be paid for out of pocket and they're not very expensive when it comes to buying medical equipment.
Medicare though might cover the cost of a shower chair but even then it's not guaranteed.