Welcome to the Surveillance Knowledge Repository

Click on a topic under the Key Topic Areas section in the left column, then select a resource  from the list of resources that appear for that topic. You may also search for specific topics by entering one or more keywords in the Search bar. You can filter the search results by Content Type, Year, or Author Name.


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The ICD-9 codes for acute respiratory illness (ARI) and pneumonia/influenza (P&I) are commonly used in ARI surveillance; however, few studies evaluate the accuracy of these codes or the importance of ICD-9 position. We reviewed ICD-9 codes reported among patients identified through severe... Read more

Content type: Abstract

The compliance date for the ICD9-ICD10 transition is October 1, 2015. The hospitals have started the ICD9-ICD10 transition. However, not all data providers will transition the data at the same time. In order to facilitate some coherence to the data during this transition period, user interface... Read more

Content type: Abstract


Syndromic surveillance of emergency department(ED) visit data is often based on computerized classifiers which assign patient chief complaints (CC) tosyndromes. These classifiers may need to be updatedperiodically to account for changes over time in the way the CC is recorded or because... Read more

Content type: Abstract

The Veterans Health Administration (VHA) operates over 880 outpatient clinics across the nation. The Johns Hopkins Applied Physics Laboratory’s Electronic Surveillance System for the Early Notification of Community-Based Epidemics (ESSENCE) utilizes VHA ICD9 coded outpatient visit data for the... Read more

Content type: Abstract

Patients who suffer from rare diseases can be hard to diagnose for prolonged periods of time. In the process, they are often subjected to tentative treatments for ailments they do not have, risking an escalation of their actual condition and side effects from therapies they do not need. An early... Read more

Content type: Abstract

The US Department of Health and Human Services has mandated that after October 1, 2015, all HIPAA covered entities must transition from using International Classification of Diseases version 9 (ICD- 9) codes to using version 10 (ICD-10) codes (www.cms.gov). This will impact public health... Read more

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The primary objective of this study is to assess the capability of an advanced text analytics tool that uses natural language processing techniques to extract important medical information collected as part of routine emergency room care (history, symptoms, vital signs, test results, initial... Read more

Content type: Abstract

Previous reports from participating facilities in North Dakota illustrated that ILI syndrome data from syndromic surveillance data, which is based on chief complaints logs, had a close correlation to the traditional ILI surveillance and that frequency slope of the ILI syndrome was also closely... Read more

Content type: Abstract

From 2001-2011, mental health-related hospitalizations and ED visits increased among United States children nationwide. During this period, mental health-related hospitalizations among NYC children increased nearly 23%. To estimate mental health-related ED visits in NYC and assess the use of... Read more

Content type: Abstract

Bordetella pertussis infection (whooping cough) has been on the rise and the most cases in the US since 1955 were reported in 2012 (48,277 or 15.4 per 100,000). Pertussis is highly infectious and can cause serious illness in infants and children as well as adults, and in general is preventable... Read more

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