# CHI number bug in `nhs-number`

**Category:** [nhs-number](https://openhealthhub.org/c/nhs-number/56)
**Created:** 2026-04-27 12:10 UTC
**Views:** 10
**Replies:** 0
**URL:** https://openhealthhub.org/t/chi-number-bug-in-nhs-number/2976

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## Post #1 by @pacharanero

Hi, just want to flag an issue noticed in the `nhs-number` Python package in case fixing it will create any issues for people.

https://github.com/uk-fci/nhs-number/issues/59

It's my belief that since no valid CHI numbers are in the range affected, the fix will not cause any behaviour change in downstream programs. But I am sense-checking that with the community first.

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**Canonical:** https://openhealthhub.org/t/chi-number-bug-in-nhs-number/2976
**Original content:** https://openhealthhub.org/t/chi-number-bug-in-nhs-number/2976