As defined in the Developmental Disabilities Assistance and Bill of Right Act (Public Law 106-402, as amended):

A developmental disability is a severe, chronic disability which:

Is attributable to a mental or physical impairment or combination of mental and physical impairments, and

Is manifested before the person attains age 22, and

Is likely to continue indefinitely, and

Results in substantial functional limitation if three or more of the following areas of major life activity:

Self-care

Receptive and expressive language

Learning

Mobility

Self-direction

Capacity of independent living

Economic self-sufficiency, and

Reflects the person's need for a combination and sequence of special, interdisciplinary or generic care, treatment, or other services which are lifelong or extended duration and are individually planned and coordinated.