The Lakes District Health Board has started planning to manage 48 hours of strike action by the Resident Doctors' Association.
The planned strike will be from 7am January 15 until 7am January 17.
Previous industrial action involving junior doctors saw most non-urgent services cancelled in order to ensure the DHB's senior doctors could focus on those in most need.
Lakes DHB contingency planner Nina Dobson said on the strike days, all elective or scheduled surgeries would need to be postponed, along with the majority of outpatient clinics.
Patients will be contacted individually by Lakes DHB if their appointment or procedure needs to be changed.