After you have registered for an NHS account and proven who you are, you can see your NHS number.
Using the NHS App, you can log in to your account, and then see your NHS number at the top of the homepage.
You can also see your NHS number by selecting the Account icon in the top-right of the screen, then Settings and Manage NHS account.
More information
You can get more help on how to prove who you are:
https://help.login.nhs.uk/provewhoyouare
If you have proved who you are, and you still cannot see your NHS number, let us know so that we can look into it for you.
You can also use the Find My NHS Number service:
https://www.nhs.uk/nhs-services/online-services/find-nhs-number/