130 CMR, § 456.455
A nursing facility provider that voluntarily withdraws from MassHealth and continues to operate as a nursing facility may not participate as a MassHealth nursing facility provider for up to five years after the date of notice of the intent to withdraw, except to the extent, as determined by MassHealth, that the facility's participation in MassHealth is necessary for the health, welfare, and safety of members. If on the date that the withdrawal was to be effective, the nursing facility is still providing services to MassHealth members, then the facility will continue to be a MassHealth provider with regard to those members but will otherwise be considered withdrawn from the program. In such circumstances, the facility must notify MassHealth of its need to keep its MassHealth provider number.
130 CMR, § 456.455