About National Notifiable Diseases Surveillance System (NNDSS)

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About

The National Notifiable Diseases Surveillance System (NNDSS) collects case surveillance data from across the U.S. to keep people healthy.

Collaborating to keep the U.S. healthy

Learn more about NNDSS, its surveillance efforts and the role it plays in the prevention and control of infectious and non-infectious conditions.

What is Case Surveillance?
Case surveillance and NNDSS help protect the health of communities and the nation.
Case Definitions
Notifiable Infectious Disease Data Tables
Learn about the differences between provisional and finalized data at the CDC.
Notifiable Non-Infectious Disease Data
Access a list of notifiable noninfectious disease data tables.
Event Codes & Other Surveillance Resources
Case Surveillance in Action
Stories about how case notification data help us understand, track, and respond to health threats.
Case Surveillance Modernization
CDC is collaborating to modernize the exchange of case surveillance data for public health action.

Interested in onboarding?

On March 20, 2024, CDC ended the pause on Message Mapping Guide (MMG) onboarding. Learn how to implement an MMG or contact edx@cdc.gov

Resources

Message Mapping Guides & Standards
Technical Resource Center
A collection of resources for the NNDSS Technical Resource Center.
Event Codes & Other Surveillance Resources
Acronyms and Abbreviations
Find definitions for commonly used Technical Resource Center acronyms and abbreviations.
News
Learn about and subscribe to Case Surveillance News.
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Content Source
Office of Public Health Data, Surveillance, and Technology (OPHDST)
About This Page
Published: November 20, 2024
Updated: January 14, 2026

This page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.

Reviewed: January 13, 2026

The information on this page was last reviewed by subject matter experts to ensure accuracy.