Have you filled in PWD option in the NEET application form? If yes, then please reach out to NTA helpdesk at: neet @ nta .ac.in  from your registered email id. Also attach a copy of your PWD certificate. They will look into it. But if you haven't selected PWD option in your NEET application form, then it might not come in the Admit card. But please do mail NTA from your registered email id and they will help you. NTA usually takes 24-72 hours to respond to the mails. But do not worry. They will respond.