To claim the deduction under Section 80U, you need to have a certificate of disability from a recognized medical authority in Form 10-IA. You do not need to submit any bills or receipts for the treatment or expenses related to your disability. You can submit the certificate along with your income tax return under Chapter VI-A of the Income Tax Act. The certificate should be valid for the assessment year for which you are claiming the deduction. If the certificate has expired, you need to obtain a fresh one from the next year.