Trichinellosis v1

Query purpose: 

Created by the CDC National Syndromic Surveillance Program (NSSP) for use with emergency department data to develop queries for all National Notifiable Diseases defined by the National Notifiable Disease Surveillance System (NNDSS). Please note that while the disease queries are developed using the NNDSS case definition as the basis for identifying patient visits of interest, the queried patient visits themselves may or may not represent a case patient in NNDSS and further public health investigation will most often be required. 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 trichinellosis 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 as 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 trichinellosis chief complaint free text terms:
  • The visit is included if it contains:
    1. A chief complaint related to disease name – (“Trichin”) OR
• Inclusion based on ICD-10 discharge diagnosis codes related to trichinellosis:
  • The visit is included if it contains:
    1. A discharge diagnosis code of Trichinellosis – (B75) OR
• Inclusion based on SNOMED discharge diagnosis codes related to trichinellosis:
  • The visit is included if it contains:
    1. A discharge diagnosis code of an infection caused by larvae of the genus Trichinella – (709018004 or 88264003 or 1177049006 or 1177052003 or 1177050006 or 1177048003 or 1177051005 or 1177046004) OR
    2. A discharge diagnosis code of trichinosis – (240117006 or 240867002 or 240868007 or 233747001) OR
    3. A discharge diagnosis code of an infection caused by a disease agent of the genus Trichinella – (721830003) ANDNOT
• All the above must exclude:
  • An ICD-10 discharge diagnosis code for Trichomoniasis – (A59) OR
  • An ICD-10 discharge diagnosis code for Contact with and (suspected) exposure to infections with a predominantly sexual mode of transmission – (Z20.2) OR
  • An ICD-10 discharge diagnosis code for Acute vaginitis – (N76.0) OR
  • An ICD-10 discharge diagnosis code for Urinary tract infection, site not specified – (N39.0) OR
  • A chief complaint term related to symptoms of trichomoniasis – (“sexually transmitted disease” or “vagin” or “urin”)