The Waitematā, Auckland, and Counties Manukau district health boards have activated their Covid-19 resurgence plans, and are postponing outpatient appointments and elective surgeries.
Some planned care will be done by phone or online instead, and urgent or emergency care will still be provided as normal.
The Northern region's lead health co-ordinator for the response, Fepulea'i Margie Apa, said postponing care could be worrying for people, and it was not a decision the health boards took lightly.