The Betsi Cadwaladr health board, which serves Llangollen, says anyone with an appointment or procedure booked with any of its services on the bank holiday declared to mark the Queen's funeral next Monday should assume it is going ahead as planned unless told otherwise.
As part of the period of official mourning, Monday September 19 will be a national holiday to allow people to observe the state funeral of Elizabeth II who died last week.
The health board said in a statement: "Our services will be running in line with normal Bank Holiday arrangements. We are working hard to ensure any disruption is kept to a minimum. Anyone who has an appointment/ procedure within any of our services that day should assume it is going ahead as planned unless told otherwise.
"There is no need to call us as we will contact any patient whose appointment/ procedure needs to be re-arranged.
"If you have an appointment/ procedure for Monday which you no longer wish to attend, please let us know at the earliest opportunity using the contact details on your appointment letter, or by cancelling your appointment online.
"Urgent and Emergency services and our Urgent Primary Care Centres will run as normal. GP Out of Hours services will also continue to be available."
The statement adds: "Some GP practices will be open on Monday, September 19 and a list of these will be available here as soon as possible.
"If GP practices close on the bank holiday, they are responsible for rescheduling pre-booked appointments as necessary and supporting patients to receive prescriptions, especially repeat medicines, in advance of the bank holiday. For patients of GP practices that will close, the usual out of hours service will be provided over the bank holiday as normal.
"We would advise people to contact dental, optometry and community pharmacy providers to confirm available services on the bank holiday. There will be no change to emergency dental services. Contact information for minor injury units, dental, optometrists, pharmacies, mental health services, GP Services, NHS 111, sexual health clinics.
"Across North Wales will be open for pre-scheduled appointments. Currently our vaccination booking team is contacting members of the public to offer an alternative date for those booked in on Monday, if preferred. Scheduled care home visits will be maintained and delivered as planned."
Information on the COVID-19 Vaccinations Programme.