Peaches, I am also a high functioning person with DID. It happens. And I also have parts that do not believe the diagnosis is correct. Writing that sounds funny!

For my insurance it doesn't matter what diagnosis is on the record. I see no reason to add the diagnosis unless it will help you get treatment. Insurance companies do have their data hacked once in a while, so why not keep it private?

My family of origin does not know my diagnosis. I have told very few people-only those who in my opinion need to know. Husband, pdoc, various Ts, best friend, GP. I don't really want to have to defend the diagnosis, nor do I want to upset them.

It is a hard diagnosis to hear. Like you, I tend to avoid people because I am embarrassed by my switching and dissociation.

It sounds like the book is helpful regardless of diagnosis; I'd keep on working on that. And perhaps at some point seek out a T who has experience with DID. The border between many disorders is fuzzy and there is a lot of overlap. A different provider might think differently.