@david_vizcaya would it be possible to summarize reasons as to why this might be - per published literature.
Looking at the counts from OHDSI Concept Prevalence study (again thank @aostropolets for leading this remarkable effort)
N00 - I found the codes to be not used much
N01 - also similar
While almost all data is loaded on N17
The word ‘nephritic’ represents a type of glomerular disease that involves inflammation of the kidney glomeruli. This would be speculation on my part – it may be because to make this diagnosis it may need taking a biopsy of the kidney or having specific tests that confirm the pathological state - so maybe it is not used.
But, the concept prevalence study tells us that in reality your loss of sensitivity is not much if you decide to not use N00/N01. So we are good with the design choice you made of not using N00, N01