Hello Neha

As per the latest notification by AIIMS, Candidates who have completed Basic Registration but have not generated unique code till date will be given another opportunity to generate the code.
The facility for Generation of Code will re-open from 23rd February 2019 to 12 March 2019 (up to 5 pm)

https://www.aiimsexams.org/pdf/addendum%20No.5%20_MBBS_Jan19.pdf

Good Luck!

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Hey Neha, I am so sorry that you missed the date , but the code generation window was between january 29th and february 17th, but then dont be worried, i would suggest you to send a mail to the Assistant Controller of Examinations-

exams.ac@gmail.com

Tell him/her your problem and request for a solution humbly and i am sure they will guide you through it, good luck