I currently have a disability claim that va has deferred. It is for heart disease, and they are waiting for the 60 day review period to end. The regulation was finalized Aug 31 for presumptive disability benefits for ischemic heart disease for vets exposed to agent orange. I have been told that they will pay retroactively to the first date of application. I originally applied for my heart condition in 1993 but was denied. How far back will they go if I am approved for benefits?