Medicare payer. The first digit of each code is the organization that provides the funds. for the care; additional digits provide more information about the specifics of the plan or. mechanism through which these funds are provided.
Attention deficit hyperactivity disorder: A disorder in which a person is unable to control behavior due to difficulty in processing neural stimuli, accompanied by an extremely high level of motor activity.
Article Body. Attention-deficit/hyperactivity disorder (ADHD) is one of the most studied conditions of childhood, but ADHD may be caused by a number of things.