The NLM Classification is a broad classification adaptable for special collections of any size or format. It is suitable for both large and small library collections and may be adapted to handle specialized collections of any size.

The latest version of the NLM Classification can be found online. The NLM Classification Editorial Committee updates the Classification twice a year with the winter edition published in January and the summer edition published in August.

The NLM Classification Editorial Committee’s activities include:

• Systematic reviews of selected schedules.
• Additions/changes to the Index based on new or replaced Medical Subject Headings (MeSH).
• Verification of selected LCC class numbers used in the Index.
• Resolution of classification problems raised by NLM catalogers and customers.
• Consultation of outside subject experts/medical librarians before major changes to the schedules are made, if needed.