Skip to main content

What is a PMID?

And have they changed their numbering system lately?

PMID numbers are unique identifiers assigned by the National Library of Medicine; every article in their database of over 20,000,000 articles has a unique number. Usually they are 9 digits long.

Recently they have begun adding "version numbers" which indicate changes and amendments to records.

See other FAQs about: 

Can't find what you're looking for?  Contact us.