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Event codes1, policies, updates, and supporting documents for case notifications.
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Event Codes & Other Surveillance Resources
Event Codes & Other Surveillance Resources
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Non-expiring
- Revised Guidelines for Determining Residency
- CSTE Case Notification Request (CNR) Statement
- CSTE Position Statement: Policy and Procedure for Timeliness of Case Notifications
- Guidance for using SAMS to load NETSS files
- Reporting Exceptions for National Notifiable Diseases (NND)
National notifiable diseases which are not reportable by law or regulation in reporting jurisdictions for the specified year are considered reporting exceptions. - MMWR Weeks Fact Sheet
- Current and Past Notifiable Conditions
- FAQs about implementing the “Country of Usual Residence” data element
This document includes guidance for implementing the “Country of Usual Residence” data element in HL7® case notifications.
2026 Resources
- Event Codes and Associated PHIN VADS Value Sets
- MMWR Weeks Calendar
- Notification Requirements
- Letters to State and Territorial Epidemiologists about NNDSS Updates
2025 Resources
- Event Codes and Associated PHIN VADS Value Sets
- MMWR Weeks Calendar
- Notification Requirements
- Letters to State and Territorial Epidemiologists about NNDSS Updates
2024 Resources
- Event Codes and Associated PHIN VADS Value Sets
- MMWR Weeks Calendar
- Notification Requirements
- Letters to State and Territorial Epidemiologists about NNDSS Updates
2023 Resources
- Event Codes and Associated PHIN VADS Value Sets
- MMWR Weeks Calendar
- Notification Requirements
- Letters to State and Territorial Epidemiologists about NNDSS Updates
2022 Resources
- Event Codes and Associated PHIN VADS Value Sets
- MMWR Weeks Calendar
- Notification Requirements
- Letters to State and Territorial Epidemiologists about NNDSS Updates
2021 Resources
- Event Codes and Associated PHIN VADS Value Sets
- MMWR Weeks Calendar
- Notification Requirements
- Letters to State and Territorial Epidemiologists about NNDSS Updates
2020 Resources
- Event Codes and Associated PHIN VADS Value Sets
- MMWR Weeks Calendar
- Notification Requirements
- Letters to State and Territorial Epidemiologists about NNDSS Updates
2019 Resources
- Event Codes and Associated PHIN VADS Value Sets
- Conditions that Only Use the Generic v2.0 Message Mapping Guide
- MMWR Weeks Calendar
- Notification Requirements
- Letters to State and Territorial Epidemiologists about NNDSS Updates
2018 Resources
- Event Codes and Associated PHIN VADS Value Sets
- Conditions that Only Use the Generic v2.0 Message Mapping Guide
- MMWR Weeks Calendar
- Notification Requirements
- Letters to State and Territorial Epidemiologists about NNDSS Updates
2017 Resources
- Event Codes and Associated PHIN VADS Value Sets
| 2017 National Notifiable Diseases Surveillance System Event Code List (Release 3; 12/15/2017) Note: the 2017 NNDSS Event Code List was updated to add additional conditions in support of Arboviral notifications. | PHIN VADS Value Set Link to the National Notifiable Disease Surveillance System (NNDSS) 2017 Event Code List |
- Conditions that Only Use the Generic v2.0 Message Mapping Guide
- MMWR Weeks Calendar
- Notification Requirements
- Letters to State and Territorial Epidemiologists about NNDSS Updates
2016 Resources
- Event Codes and Associated PHIN VADS Value Sets
- Conditions that Only Use the Generic v2.0 Message Mapping Guide
- MMWR Weeks Calendar
- Notification Requirements
- Letters to State and Territorial Epidemiologists about NNDSS Updates
2015 Resources
- Event Codes and Associated PHIN VADS Value Sets
- Conditions that Only Use the Generic v2.0 Message Mapping Guide
- MMWR Weeks Calendar
- Notification Requirements
- Letters to State and Territorial Epidemiologists about NNDSS Updates
2014 Resources
- Event Codes and Associated PHIN VADS Value Sets
- MMWR Weeks Calendar
- Notification Requirements
- Letters to State and Territorial Epidemiologists about NNDSS Updates
2013 Resources
- Event Codes and Associated PHIN VADS Value Sets
2012 Resources
- Event Codes and Associated PHIN VADS Value Sets
2011 Resources
- Event Codes and Associated PHIN VADS Value Sets
2010 Resources
2009 Resources
2008 Resources
2007 Resources
Other Historical Resources
- Provisional National Notifiable Diseases Surveillance Data
- Description of the computation of the 5-year weekly average displayed in MMWR Table 1
1 For NNDSS event code lists (2004-2010), please view the MMWR: Summary of Notifiable Diseases.
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Last Reviewed: September 2, 2026