Medicare typically won’t cover walk-in tubs because they aren’t considered “durable medical equipment,” like hospital beds or crutches. Occasionally, Medicare might provide a partial reimbursement after a tub is installed, but only if it’s considered an absolute medical necessity.
Medicaid is more likely to cover some of the costs for a walk-in tub or “low-threshold shower,” but it’s not guaranteed. Depending on where you live, state programs might pay for some or all of the cost.