well im a student also from south east asia (philippines) well firstly i hope im not too late to help you.
here in our country Pt dont have as much freedom as you guys there(due to our stupid law and lazy congressmans) so they dont let us call it pt-diagnosis hence it is reffered to as pt-impression.
well the main thing about pt-impression/diagnosis is your analysis and explanation on what is your patients problem and is condensed in a one full pack sentence/paragraph.
it is usually comprised of participation restriction, activity limitations, impairment then the medical condition.
I usually make it AL-->
PR due to I 2ndary to med diag.
ex.
"inability to walk makes the px unable to perform role as a parent due to weakness of the (R) knee extensors 2" to L3 palsy."
I usually have a prob bec. there is no general agreement on how it should be done. just remember its purpose is to communicate what ur patients problems are...