42 CFR § 440.80 - Private duty nursing services.
Private duty nursing services means nursing services for beneficiaries who require more individual and continuous care than is available from a visiting nurse or routinely provided by the nursing staff of the hospital or skilled nursing facility. These services are provided -
(a) By a registered nurse or a licensed practical nurse;
(1) His or her own home;
(2) A hospital; or
(3) A skilled nursing facility.