The Correction window for NEET PG  will be available from December 7 to 14, 2018. 
After the close of registration, candidates will be communicated about their incorrect details within 15 days after the close of registration. Thereafter, aspirants will be given one week to correct the information in NEET PG application form. But this is something that you might not be notified about. So I would suggest you to keep an open eye on the correction window and change it accordingly. 

You can also reach out to them at nbeexamhelpdesk@gmail.com or call them up at 1800- 266-7075, toll free no# from Monday to Friday 9.30am to 6.00pm