Here is a claim that involves, ultimately, a claim for Total Disability due to Individual Unemployability (TDIU). The Veteran’s disabilities combine to cause him to be unable to work and he still lacks a 100% disability rating. If you have one disability at 40% or greater, combined with others to attain 60% or if you have one disability at 70%, you may apply for TDIU and be rated at the total rate. You will have to prove this annually in order to continue your 100% TDIU disability . Ideally, you would like to have one disability rated at 100% which is never going to get better. Then you will eventually qualify for the Permanent and Total rating. When you attain this Holy Grail, you will be excused from any future examinations and also qualify for a host of other benefits from VA.

http://www.va.gov/vetapp08/Files4/0828005.txt

Bravo, VLJ Guido. Adjudication well done.