Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Service Alert: Planned Maintenance beginning July 25th

Some services may be unavailable or have limited functionality for 24 hours or longer starting 9 PM EDT. Learn more about the maintenance.


Exceptions

  • A few headings marked as SPEC, such as Pediatrics and Geriatrics, have no corresponding disease descriptors
  • In these cases, the SPEC heading is used as a synonym for general works on “pediatric diseases” or “geriatric diseases”

Last Reviewed: July 19, 2017