Section 80U tax deductions are over and above other deductions and are meant for people who suffer from disabilities.
This section can only be utilized if you suffer from the disability yourself and is not applicable for parents, spouse or any other dependents.
They have two classes of disabilities – one where the person suffers from a disability and the other where a person suffers from severe disability.
You need proof from a medical practitioner to decide what kind of disability you suffer from, and a person from disability will get a deduction of up to Rs. 50,000 from his taxable income while a person who suffers from severe disability can get a deduction of Rs. 1,00,000.
TaxWorry has a list of what constitutes disability, and what constitutes severe disability on their site.
You will also find the forms that need to be downloaded on that link.
I can’t quite remember if they propose to have this deduction or any other form of it post the Direct Tax Code, so I’ll update that aspect once I know more about it.