Trying to gather PED for my mother in law. She had knee pain in 2018 and got treated for that in 2018(one injection per week for few weeks). After that no more knee pain trouble or any treatment related it. But the problem now is, she has no documents related to it or any prescription or she has no idea what is the medical term for that. Now what i can do for declaring this knee pain as PED while buying insurance for her ? I have no idea how to proceed with this ? If we have diabetes we can say diabetes in PED as simple as that, but i think knee pain has many categories medical terms in it(based on experience for my mother), Without knowing exactly how should i declare in this case ? If i say knee pain for sure they might ask document or prescription or any sort of diagnosis which she never have it at all.