Can a chatbot diagnose medical conditions as accurately as a human? Babylon Health, a UK artificial intelligence firm, says a version of its software can pass the standard exam taken by British family doctors, but some medics are pushing back against the claim.

Babylon’s AI is designed to give people a probable medical diagnosis through a “symptom checker” app.

It is not the only such app available, but it is the most visible one in the UK at the moment. The company has a contract with the National Health …