Source Files

The HCUP Michigan emergency department (ED) files were constructed from a combined outpatient data file provided by the Michigan Health & Hospital Association. The Michigan Health & Hospital Association uses an emergency department flag to distinguish the emergency department records from other outpatient records on the file.

Selection of Records for Inclusion in the SEDD

All records identified by Michigan as ED are included in the SEDD (HCUP data element STATE_ED=1 based on place of service type 1 [Emergency Room]).

Additionally, any other records with evidence of ED services that are flagged by the variable HCUP_ED (i.e., HCUP_ED>0) during HCUP processing are included in the SEDD.

If a record in the SASD also has evidence of ED services based on the HCUP criteria (HCUP data element HCUP_ED not equal to 0), then the SASD record is also included in the SEDD. These records will have the same value for the HCUP data element KEY.

Types of Facilities Included in the Files Provided to HCUP by the Partner

The Michigan Health & Hospital Association provides HCUP with ED data from licensed hospital-owned EDs in the State.

A comparison of the number of hospitals included in the SEDD and the number of hospitals reported in the AHA Annual Survey is available starting in data year 2018.

Hospital-owned EDs do not always report data for a full calendar year. Some open or close during the year; others have technical problems that prevent them from reporting data for all months in a year.