You must contact your original department about readmission. This office will be unable to issue an I-20 until we have confirmation from your previous department that you are able to resume your full-time degree seeking program.
Apply for a new I-20. If you notified us that you were leaving the U.S. we ended you previous Sevis Record. This means that you need to apply for a new I-20 and probably a new visa. See http://www.temple.edu/isss/pdfs/f1/validityofstudentvisas.htm for details. According to the information at that site your visa, even if it's not expired, is no longer valid if you've been out of the U.S. for more than five months. Contact us at email@example.com if you are coming back in fewer than five months.
In applying for a new I-20 you will need to provide the ISSS with updated financial documentation. See tuition and fees
When we send you the I-20 you will be required to pay the Sevis fee again. See www.fmjfee.com