From time to time, a client whose case we have already won will call and tell me that their doctor has diagnosed them with a new condition that they did not have before and things are worse. They want to know, "Can I get more Social Security Disability benefits?"
The answer is "No." Think of Social Security disability benefits like a light switch. It is either on or off. There is no dimmer. The benefits you receive are tied to the amount of work and taxes you have paid over the years. Generally, the more you work, the more you earn, and the more taxes you pay over the years, the more you will receive in Social Security disability benefits.
Here is an article from the Asbury Park Press that gives a good explanation.