# NHS Login - userinfo endpoint **URL:** \ **Category:** NHS login\ **Created:** [2 October 2026 09:52 UTC](https://developer.community.nhs.uk/t/nhs-login-userinfo-endpoint/15446 "2026-10-02T09:52:45Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Malgorzata\_Rogowska1](https://avatars.discourse-cdn.com/v4/letter/m/aeb1de/32.png) [@Malgorzata\_Rogowska1](https://developer.community.nhs.uk/u/Malgorzata_Rogowska1)\ **Post date:** [2 October 2026 09:52 UTC](https://developer.community.nhs.uk/t/nhs-login-userinfo-endpoint/15446/1 "2026-10-02T09:52:45Z")
Hi NHS Login team, I’m from the NHS Health Check Online service team, and we wanted to confirm with you, if the `sub` UUID returned from the `userinfo` endpoint is unique to the patient on the NHS Login level and cannot be changed. This is related to the topic we’ve asked about recently: [NHS Login handling of superseded NHS numbers](https://developer.community.nhs.uk/t/nhs-login-handling-of-superseded-nhs-numbers/15201) . Thank you, Małgorzata ---
**Author:** ![Stephen\_Willis](https://avatars.discourse-cdn.com/v4/letter/s/8baadc/32.png) [@Stephen\_Willis](https://developer.community.nhs.uk/u/Stephen_Willis)\ **Post date:** [2 October 2026 11:53 UTC](https://developer.community.nhs.uk/t/nhs-login-userinfo-endpoint/15446/2 "2026-10-02T11:53:07Z")
Afternoon Malgorzata, There is no guarantee that a person always has the same UUID. For example if they delete and recreate their account they would have a different UUID. ---
**Author:** ![Malgorzata\_Rogowska1](https://avatars.discourse-cdn.com/v4/letter/m/aeb1de/32.png) [@Malgorzata\_Rogowska1](https://developer.community.nhs.uk/u/Malgorzata_Rogowska1)\ **Post date:** [2 October 2026 12:22 UTC](https://developer.community.nhs.uk/t/nhs-login-userinfo-endpoint/15446/3 "2026-10-02T12:22:59Z")
Hello Stephen, thank you for the quick reply! That makes sense, thank you for the clarification. Kind regards,