Average Number of Contact Days with the Health Care System per Beneficiary, by Cohort
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        • The denominator comprised the Medicare population age 65-99 on January 1, 2012 that was eligible for Medicare Parts A and B. Patients enrolled in risk-bearing HMOs at any time during the year were excluded. Age, gender, race, and eligibility were determined using the Denominator file.

        • The numerator consisted of contact days with the health care system—acute care hospital stays, ambulatory visits to clinicians, procedures, tests, and imaging—indicated by a claim in either the Medicare Provider Analysis and Review (MedPAR) file or the Carrier (Physician/Supplier Part B claims) file. If more than one claim occurred on the same date, the day was only counted once.

        • ADJUSTMENTS:
        • Rates were adjusted for age, sex, and race using the indirect method.


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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.