Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Skip to main content
National Library of Medicine logo

Classification 2025 Summer Edition

Worldwide source of medical classification resources

Class Index

non-alpha A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Clinical laboratories
QY 70
Dental
WU 40
Hospitals (General)
WX 40
Special (Form numbers 27-28 in any NLM schedule where applicable)
Institutes, etc. (Form numbers 23-24 in any NLM schedule where applicable)
Physicians
W 40
Other professionals (Form number 21 in any NLM schedule where applicable)
Schools (Form numbers 18 or other appropriate education number in any NLM schedule where applicable)
See also Certification
See also Licensure