Hello Nisha

Another opportunity to generate the code has been provided by the AIIMS authorities for the candidates who have completed Basic Registration but have not generated unique code till date.
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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The last date for generating the code has gone of AIIMS 2019, it is now not possible to generate the code .The candidates who do not have the code can not carry on the registration process and will not be able to complete the final registration. You will have to wait until next year or can try for either JIPMER or NEET if you want to pursue MBBS as a career option. 

Thank you