Check the academic calendar to make sure that you are still within the allowable time frame for withdrawal. Check whether your timing allows you to receive a partial or full reimbursement of your tuition.
Meet with the appropriate school administrator to discuss your withdrawal, if necessary. Many schools consider withdrawal for medical reasons to be different from other reasons for withdrawal, and therefore have a separate set of guidelines for those events. You may need to meet with a school official school to receive this recognition administratively. For example, the University of Virginia advises its withdrawing students to meet with someone in the Student Health office to discuss the medical issue so that their paperwork may be processed accordingly.
Draft a letter requesting your withdrawal from the university and make sure that you date it. Sign the letter. You can type or write the letter, but your signature must be handwritten.
Make a copy of the letter for your records. In the event paperwork goes missing or is mishandled, you will want evidence that you sent a letter.
Mail the letter or take it to the campus registrar's office.
Call the office to confirm their receipt of your letter and your official withdrawal. Contact other offices handling integral parts of your academic career like the treasurer's office or the advising office of your academic area.