80DDB for specified ailments, but you have to get the government doctor to sign off on prescribed for.  Doctors will sign off only with documentation submission and after seeing the patient

Specific ailments include neuro, nephro, oncology,  etc.

This does not come under the 150000 limit,  this is separate

UAN 

New scheme which is asked to employer to implement 

UAN allows you to show continuity of service so that Advances from PF can be better