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Percent of Patients Having an Emergency Room Visit within 30 Days of Discharge, by Cohort
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    Region
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    Percent of Patients Having an Emergency Room Visit within 30 Days of Discharge, by Cohort
    (Cohort: All Medical Discharges; Year: 2015; Region Levels: State)
    Alabama 19.2%
    Alaska 18.4%
    Arizona 20.6%
    Arkansas 20.9%
    California 20.3%
    Colorado 20.1%
    Connecticut 20.6%
    Delaware 20.3%
    District of Columbia 19.9%
    Florida 20.5%
    Georgia 21.2%
    Hawaii 18.7%
    Idaho 18.5%
    Illinois 20.0%
    Indiana 20.0%
    Iowa 19.5%
    Kansas 18.4%
    Kentucky 21.5%
    Louisiana 21.3%
    Maine 22.1%
    Maryland 18.6%
    Massachusetts 20.7%
    Michigan 20.7%
    Minnesota 19.7%
    Mississippi 21.2%
    Missouri 20.5%
    Montana 18.5%
    Nebraska 17.0%
    Nevada 21.2%
    New Hampshire 20.7%
    New Jersey 19.8%
    New Mexico 19.9%
    New York 19.7%
    North Carolina 21.3%
    North Dakota 18.3%
    Ohio 20.9%
    Oklahoma 21.6%
    Oregon 21.5%
    Pennsylvania 19.4%
    Rhode Island 21.2%
    South Carolina 20.1%
    South Dakota 15.5%
    Tennessee 21.2%
    Texas 20.1%
    Utah 17.9%
    Vermont 20.1%
    Virginia 21.2%
    Washington 21.3%
    West Virginia 22.3%
    Wisconsin 19.8%
    Wyoming 20.7%
    National Average 20.3%
    90th Percentile 21.5%
    50th Percentile 20.3%
    10th Percentile 18.4%
        • DENOMINATOR DEFINITION:
        • All medical discharges: All medical DRGs

          All surgical discharges: All surgical DRGs

          Acute myocardial infarction (CMS definition (excluded one-day stay): principal diagnosis code (ICD-9) 410.00, 410.01, 410.10, 410.11, 410.20, 410.21, 410.30, 410.31, 410.40, 410.41, 410.50, 410.51, 410.60, 410.61, 410.70, 410.71, 410.80, 410.81, 410.90, and 410.91

          Congestive heart failure (CMS definition): principal diagnosis code (ICD-9) 402.01, 402.11, 402.91, 404.01, 404.03, 404.11, 404.13, 404.91, 404.93, 428.0, 428.1, 428.20, 428.21, 428.22, 428.23, 428.30, 428.31, 428.32, 428.33, 428.40, 428.41, 428.42, 428.43, and 428.9

          Pneumonia (CMS definition): principal diagnosis code (ICD-9) 480.0, 480.1, 480.2, 480.3, 480.8, 480.9, 481, 482.0, 482.1, 482.2, 482.30, 482.31, 482.32, 482.39, 482.40, 482.41, 482.42, 482.49, 482.81, 482.82, 482.83, 482.84, 482.89, 482.9, 483.0, 483.1, 483.8, 485, 486, 487.0, and 488.11

          Hip fracture (Dartmouth Atlas definition): principal diagnosis code (ICD-9) 820xx

        • NUMERATOR DEFINITION:
        • 1) Outpatient claims: revenue center code: 0450-0459 (emergency room) and 0981 (professional fees-emergency room) and revenue center visit date not within an acute short-stay or critical access hospital claim that has emergency room payment; or 2) Hospital claims: Any acute short-stay or critical access hospital claims from the MedPAR file with emergency room payment and did not have associated Outpatient claims defined as above.

        • ADJUSTMENTS:
        • Rates are adjusted for age, sex and race using the indirect method, using the U.S. Medicare population for each cohort as the standard.




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    The Dartmouth Atlas of Health Care is based at The Dartmouth Institute for Health Policy and Clinical Practice and is supported by a coalition of funders led by the Robert Wood Johnson Foundation, including the WellPoint Foundation, the United Health Foundation, the California HealthCare Foundation, and the Charles H. Hood Foundation.