have the wrong diagnosis?

Can you say that you have the wrong diagnosis, when giving one or receiving one?

You can, but it wouldn't be my preferred way of saying it.

I went to the doctor last week but he gave me the wrong diagnosis.
I am a doctor and last week, I gave a patient the wrong diagnosis.

I have been wrongly diagnosed. (Patient)
I have wrongly diagnosed someone. (Doctor)

Thanks!

Your thanks are appreciated, bridge, but you don't need to send them in a separate post.

We are all happy to accept a simple click on the Like button as your acknowledgement of our help.

Rover:-D