Median Time from ED Arrival to ED Departure for Discharged ED Patients

Last updated: May 3, 2018

CMS Measure ID: CMS32v4
Version: 4
NQF Number: 0496
Measure Description:

Median time from emergency department arrival to time of departure from the emergency room for patients discharged from the emergency department.

Initial Patient Population:

Patients seen in an emergency department and discharged.

Measure Population:

Any emergency department (ED) visit during the measurement period.

Measure Observations:

Median Time (in minutes) from ED arrival to ED departure for patients discharged from the emergency department.

Denominator Statement:

Not applicable

Denominator Exclusions:

Not applicable

Numerator Statement:

Not applicable

Numerator Exclusions:

Not applicable

Denominator Exceptions:

Not applicable

Measure Steward: Centers for Medicare and Medicaid Services
Domain: Communication and Care Coordination
Short Name: ED3
Next Version:
Measure Score: Continuous Variable
Score Type: Process
Improvement Notation:

A decrease in the median value indicates less time in the emergency department and enhances throughput.


This measure uses a continuous variable. The specification provides elements from the clinical electronic record required to calculate for each ED encounter, i.e., the length of time the patient was in the Emergency Department, also stated as: the Emergency Department departure time minus the Emergency Department arrival time. The calculation requires the median of all ED encounter durations. This measure specification defines how to determine an individual Emergency Department stay. Reporting requires the median of all patient stays ([Encounter: encounter ED].departuredatetime - [Encounter: encounter ED].arrivaldatetime).

The measurement period is one calendar year but the reporting period is 3 months as a calendar quarter; Q1 = Jan – Mar, Q2 = Apr – Jun, Q3 = Jul – Sep, Q4 is Oct – Dec.


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