On the English Wikipedia, attempting to view Module:ICD11 - https://en.wikipedia.org/wiki/Module:ICD11 - gives the following error:
A database query error has occurred. This may indicate a bug in the software.
[Xou5bQpAICAAAEgOdAIAAAAT] 2020-04-06 23:21:17: Fatal exception of type "Wikimedia\Rdbms\DBQueryError"
The revision history is visible, but none of the oldid versions are accessible.
The module contains a lookup for around 32,000 ICD-11 codes returning the identifier that specifies the url on the WHO site for that code.