Some can be done remotely if you play the part of the on-site diagnostician.
From the post-gazette.com
This was the treatment prescribed by the diagnostician at the beginning of each visit.
From the scienceblogs.com
Take Anna Petrick, a diagnostician in the Spring Branch school district.
From the chron.com
Chekhov is a great diagnostician, a man with an immensely vital sense of life on the wane.
From the time.com
She is a much better diagnostician than many MD's I have seen.
From the forbes.com
An over-eager diagnostician might label one person's appropriate sadness as clinical depression.
From the blogs.psychcentral.com
Another example might be a doctor who is a skilled diagnostician.
From the en.wikipedia.org
This article uses diagnostician as any of these person categories.
From the en.wikipedia.org
A good diagnostician must be a keen and vigilant observer.
From the forbes.com
More examples
A doctor who specializes in medical diagnosis
Diagnosis is the identification of the nature and cause of a certain phenomenon. Diagnosis is used in many different disciplines with variations in the use of logic, analytics, and experience to determine "cause and effect". In systems engineering and computer science, it is typically used to determine the causes of symptoms, mitigations, and solutions.