Bishop returned to New Zealand on Saturday evening, after arriving in Australia on Friday morning.
"I have talked to Healthline, and their advice is that while I have no legal obligation to self-isolate (because the requirements do not kick in until 1am on Monday morning), they would prefer that I did so," Bishop wrote in an online post.
"I am following that advice. After I returned home last night I have confined myself to our house in Petone. I have no symptoms and am feeling totally fine."
It follows today's announcement that Green Party MP Chlöe Swarbrick will self-isolate for 14 days when she arrives back in New Zealand, after a weekend trip to Australia.
"These protocols were designed to keep everyone healthy. I do not have any symptoms, but I am registering my whereabouts with the Ministry of Health and will be following advice."
NZ First MP Tracey Martin is also in self-isolation, after meeting with Australia's Minister for Home Affairs Peter Dutton during a Five-Eyes partners meeting in Washington DC.
Dutton had no symptoms of Covid-19 at the time, but woke up with a temperate and a sore throat on Friday. He has since tested positive foe the respiratory virus and is now in hospital.
A spokesperson for Martin said she had shown no symptoms, but was self-isolating as a precaution.
