When you file for a secondary condition you really need medical evidence that spells out how, why, when your primary condition led to the secondary condition. With DMII, for instance, if you have heart problems or PN or any other secondary DMII condition you need a doctor to say that you heart or PN is a direct result of your DMII. My PCP at the VA did this for me for my PN and artery disease. If you could get a non-VA doctor to do the same thing that would work but you want to use a format the VA accepts.