My doctor hasn't changed my diagnosis even though she has speculated for months that the original diagnosis is wrong. She said it is better to leave it alone for insurance purposes. My therapist said the same thing. It must be easier to justify the treatment I need that way.

I think there's nothing wrong with asking. You would need to have the correct information for a number of reasons. For example, you'd need to be able to explain your correct diagnosis to the intake personnel should you ever need to go into IP. They might not believe you if you weren't able to explain the discrepancy.