I have a current diagnosis of schizoaffective, autism and now ADHD - inattentive type.
I get PIP standard rate.
I know diagnosis doesn't matter. Many years ago, I applied and got rejected 4 times despite having a schizoaffective diagnosis. But the 5th time I applied, I got accepted for standard rate as I had recently had a psychotic episode. When it came up for renewal, I now had an autism diagnosis so I sent the report in as "evidence". Then now I have ADHD and although my claim has already been accepted at a standard rate PIP, do I report the additional diagnosis to them even if it does not matter?