Yes you need to call your provincial medical system and advise the of your absence. You must call and cancel any CCB you are receiving while you are away unless you have a child that remains in Canada. You will likely have to reapply for your health card or get them off suspension when you return. Please look at the residency requirements of your residential provincial healthcare system.
If you don't report your absences or freeze your CCB while you are away you can be asked to pay back money/services you received snd often with fines.