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Note:The code sets are available at the Centers for Disease Control and Prevention website, http://www.bt.cdc.gov/surveillance/syndromedef/index.asp. DoD, U.S. Department of Defense.

Note:The code sets are available at the Centers for Disease Control and Prevention website, http://www.bt.cdc.gov/surveillance/syndromedef/index.asp. DoD, U.S. Department of Defense.

8 And even the health system that Tsui and colleagues studied no longer collects this data.

9 ESSENCE was first part of DoD-GEIS and now civilian health departments in a number of jurisdictions use it also.

Category 2: ...codes that might normally be placed in the syndrome group, but daily volume could overwhelm or otherwise detract from the signal generated from the Category 1 code set alone. Category 3: ...specific diagnoses that fit into the syndrome category but occur infrequently or have very few counts. These codes may be excluded to simplify syndrome category code sets.

The end result was 12 ICD code sets, each with three categories of codes. The code sets are not mutually exclusive (some ICD codes appear in more than one code set). The report of the working group does not describe the procedure they followed to reach a consensus on—or resolve conflicts over—which ICD codes to include in a code set.

This effort made use of intensional definitions for each code set (Table 23.10).The extensional definition of the Fever ICD code set is given in Table 23.11.

As with the ESSENCE code sets, researchers and system developers have used the CDC/DoD code sets in their work (Yih et al., 2004,2005).

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