Subsidy question

Our little guy had a rough beginning and was in a therapeutic foster home for the first year of his life. He had several developmental delays for which he received three different types of therapy, was monitored by four different specialists, and basically was in appointments nearly every day. When he came to us and we adopted him, he was still in the throes of most of those appointments, so even though we are not a therapeutic home, we received an adoption subsidy for him that was the same rate as the therapeutic foster care rate. Fast forward to now... We are coming up on the anniversary of his adoption so I suppose we are going to have to do some sort of review with his subsidy worker. Do we need to justify his continuing to receive the stipend? Is there a chance that he could continue to receive one but at the basic rate, or would they pull the entire stipend if they decide he is "caught up" and therefore no longer "special needs?" Is the fact that he was so addicted to drugs when he was born that he had to go back into the hospital for 5 weeks for withdrawal enough to keep him on subsidy/stipend for his entire childhood, since as he grows he is likely to have more/other issues like learning disability/emotional issues? Anyone else have experience with this?