This is from pub 501:
Qualified Long-Term Care Services
Qualified long-term care services are necessary diagnostic, preventive, therapeutic, curing, treating, mitigating, rehabilitative services, and maintenance and personal care services (defined later) that are:
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Required by a chronically ill individual, and
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Provided pursuant to a plan of care prescribed by a licensed health care practitioner.
Chronically ill individual.
An individual is chronically ill if, within the previous 12 months, a licensed health care practitioner has certified that the individual meets either of the following descriptions.
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He or she is unable to perform at least two activities of daily living without substantial assistance from another individual for at least 90 days, due to a loss of functional capacity. Activities of daily living are eating, toileting, transferring, bathing, dressing, and continence.
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He or she requires substantial supervision to be protected from threats to health and safety due to severe cognitive impairment
