Q Fever v1

Query purpose: 

Created by the CDC National Syndromic Surveillance Program (NSSP) for use with ED data as part of the rapid reportables project, which seeks to create queries for all National Notifiable Diseases defined by the National Notifiable Disease Surveillance System (NNDSS). This query is intended to be a version 1 and may be further improved upon by the NSSP community of practice in the future. This query is intended to be narrow and capture visits with specific terms to support greater monitoring and actionable public health data. More complex and/or broader queries may exist that more broadly capture symptoms or travel-based terms.

How it was developed: 

1. The CDC team used the NNDSS case definition of Q fever to identify diagnostic codes (International Classification of Diseases, 9th & 10th Revision (ICD-9-CM, ICD-10-CM), SNOMED Clinical Terms (CT)) and chief complaint free-text for syndrome development.
2. The codes and free text were then categorized as inclusion or exclusion terms. These terms were formatted for querying in ESSENCE.
3. Text analysis was conducted on the initial query to find additional inclusion or exclusion terms.
4. The query was cross-checked internally at NSSP and by CDC subject matter experts as needed.

How it works:

The Chief Complaint Discharge Diagnosis (CCDD) parsed field is used to query both the discharge diagnosis codes and chief complaint free text, and exclusions are incorporated as necessary.

• Inclusion based on Q fever chief complaint free text terms:
  • The visit is included if it contains:
    1. A chief complaint related to disease agent – (“c burnetti” or “coxiella”) OR
    2. A chief complaint related to disease name – (“Q Fever” or “Query Fever”) ANDNOT
  • The visit is excluded if it contains:
    1. A chief complaint that contains Q fever but not strictly Q fever – (“[A-Z]Q Fever”) OR
• Inclusion based on ICD-10 discharge diagnosis codes related to Q fever:
  • The visit is included if it contains:
    1. A discharge diagnosis code of Q fever – (A78) OR
• Inclusion based on SNOMED discharge diagnosis codes related to Q fever:
  • The visit is included if it contains:
    1. A discharge diagnosis code for Q fever – (186788009) OR
    2. A discharge diagnosis code for other Q fever presentations – (409553007 or 409552002 or 409554001 or 233867000 or 409556004 or 95890006 or 233884006 or 409557008) OR
    3. A discharge diagnosis code for other conditions caused by Q fever – (32286006 or 409555000)