The State agency may provide that a beneficiary who is enrolled in an MCO or PCCM and who becomes ineligible for Medicaid is considered to continue to be eligible—

(a) For a period specified by the agency, ending no later than 6 months from the date of enrollment; and

(b) Except for family planning services (which the beneficiary may obtain from any qualified provider) only for services furnished to him or her as an MCO enrollee.