Medicare's only respite benefit lives inside hospice, and its limits are precise. 42 CFR 418.302(b) sets out the four categories of hospice care CMS pays for, and (b)(3) defines an inpatient respite care day as "a day on which the individual who has elected hospice care receives care in an approved facility on a short-term basis for respite". The limit is in (e)(5): "Payment for inpatient respite care is subject to the requirement that it may not be provided consecutively for more than 5 days at a time. Payment for the sixth and any subsequent day of respite care is made at the routine home care rate." So the sixth day is not forbidden; it is paid at the wrong rate, which in practice is what ends the stay.
The patient's own liability is one of only two coinsurance items in the whole hospice benefit. 42 CFR 418.400(b)(1) sets coinsurance for each respite care day at "5 percent of the payment made by CMS for a respite care day". Paragraph (b)(2) then caps it: the individual's total respite coinsurance during a hospice coinsurance period "may not exceed the inpatient hospital deductible applicable for the year in which the hospice coinsurance period began". That deductible is reset annually by CMS and is published on medicare.gov, so the useful thing to carry away is the shape of the rule rather than a number. Paragraph (b)(3) defines the coinsurance period itself: it begins on the first day a hospice election is in effect and ends at the close of the first period of 14 consecutive days on none of which an election is in effect.
The Older Americans Act route is the one most families have never heard of. The National Family Caregiver Support Program, established in 2000 under section 371 of the Older Americans Act of 1965 as amended, Title III-E, makes grants to states and territories based on their share of the population aged 70 and over. The Administration for Community Living lists five service types the grantees provide: information about available services; assistance in gaining access to services; individual counseling, support groups and caregiver training; respite care; and supplemental services on a limited basis.
Who counts as an eligible caregiver was set by the 2020 reauthorization, and the list is broader than "adult child of an older parent". ACL lists: adult family members or other informal caregivers providing care to individuals aged 60 and over; adult family members or other informal caregivers providing care to individuals of any age with Alzheimer's disease and related disorders; older relatives who are not parents, aged 55 and over, caring for children under 18; and older relatives, including parents, aged 55 and over, caring for adults aged 18 to 59 with disabilities. Access is through the state unit on aging and the local area agency on aging, and because the money is a capped grant rather than an entitlement, what is available depends on the area and the year.
Medicaid waivers cover it, and respite gets a carve-out nothing else gets. 42 CFR 440.180(b)(7) lists "Respite care services" among the services a state may include in a home and community-based services waiver. The unusual part is in the funding limits. 42 CFR 441.310(a)(2) makes federal financial participation unavailable for "the cost of room and board except when provided as ... Part of respite care services in a facility approved by the State that is not a private residence". Room and board is otherwise the thing Medicaid waivers pointedly do not pay for, and respite in an approved facility is the named exception. As with every waiver service, the state defines the service and may cap enrollment.
Everyone else pays privately, and the practical consequence is that respite is bought in small units. For a family outside hospice, outside a waiver and outside what the local area agency on aging can fund, respite is purchased the same way any other in-home or facility care is purchased: by the hour, by the day, or by a short facility stay. Some long-term care insurance policies also provide for it, on terms set by the individual contract rather than by any general rule, which is a question for the policy rather than for a general page. The planning point is that respite competes for the same dollars as the ongoing care, so it tends to be the line that gets cut, which is exactly backwards if the ongoing care depends on a caregiver who is still functioning.