Others titles

  • Implantable Defibrillator Insertion Rates of Medicare Beneficiaries at HRR Levels 2008-2012
  • Dartmouth Altas Project Implantable Defibrillator Insertion Rate HRR Level 2008-2012
  • Medicare Implantable Defibrillator Insertion Rates HRR Level 2008-2012


  • HRR Level Discharge Rates
  • Medicare Beneficiaries with Defibrillator Insertion
  • Hospitalization Rates
  • Comprehensive Information on Defibrillator Insertion
  • Comprehensive Analysis on Defibrillator Insertion
  • Medicare Population with Defibrillator Insertion
  • Implantable Defibrillator Insertion Rates
  • Dartmouth Atlas Project
  • Medicare Implantable Defibrillator Insertion

Implantable Defibrillator Insertion HRR Levels 2008 to 2012

The dataset gives information on Implantable Defibrillator Insertion rates of Medicare beneficiaries at Hospital Referral Regions (HRR) from years 2008 to 2012. Hospitalization rates are the number of discharges that occurred in a definitive time period (the numerator) for a specific population (the denominator).

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The Dartmouth Atlas Project uses Medicare data to provide comprehensive information and analysis about national, regional, and local markets, as well as individual hospitals and their affiliated physicians. The Dartmouth Atlas Project have helped policymakers, the media, healthcare analysts and others improve their understanding of the efficiency and effectiveness of US healthcare system. The data for research purposes come from the Centers for Medicare and Medicaid Services (CMS), U.S. Census, the American Hospital Association (AHA), the American Medical Association (AMA), and the National Center for Health Statistics (NCHS). The dataset gives information on particular hospitalization rates of Medicare beneficiaries with respect to the Hospital Referral Regions (HRR). Hospital referral regions (HRR) represent regional healthcare markets for tertiary medical care; each HRR contains at least one hospital that performs major cardiovascular procedures and neurosurgery.

Numerator includes the number of discharges with particular ICD-9-CM procedure codes. Denominator in the dataset is 100% of Medicare enrollees age 65-99 with full Part A entitlement and no Health Maintenance Organization (HMO) enrollment during the measurement period. Age, gender, race, and eligibility are determined using the Denominator file. Rates are adjusted for age, sex and race using the indirect method, using the U.S. Medicare population as the standard. Gender-specific rates are age and race adjusted; race-specific rates are age and sex adjusted.

A rate is the number of events or amount of resources divided by the number in the population. Most rates of utilization and spending are adjusted to the age, sex and race distribution of the national Medicare population using the indirect method. First, the national event rate for each age-sex-race category was computed. These rates were then applied to the Hospital Service Area (HSA) population to produce the expected number of events in the HSA, that is, the number of events that would have occurred in the HSA if its rate was the same as the national event rate. It is a way to standardize for different distributions of risk factors across areas. Rates based on a count of fewer than 11 patients are not displayed for reasons of patient confidentiality. Hospitalization rates are the number of discharges that occurred in a definitive time period (the numerator) for a specific population (the denominator). Different risk factors across areas are standardized by calculating the national event rate for each age-sex-race category and applied to the Hospital Service Area (HSA) population. Rates with fewer than 26 expected events are reported in parentheses to indicate lack of statistical precision; for these rates, the margin of error is greater than 20%, so the estimate is considered statistically unreliable. Upper and lower limits for 95% confidence interval and standard error of the hospitalization rates are also displayed in the dataset.

In this dataset, the event used is ‘IDF’. The stratification used is ‘all’ for each of the records. The population unit used is ‘1000’. The geographical area type is ‘HRR’. Suppression limit is ’11’. Precision limit is ’26’.

About this Dataset

Data Info

Date Created


Last Modified




Update Frequency


Temporal Coverage

2008 to 2012

Spatial Coverage

United States


John Snow Labs; Dartmouth Atlas Project;

Source License URL

Source License Requirements


Source Citation

The data set forth at http//www.dartmouthatlas.org/downloads/tables/IDF_20082012.zip of publication/press release was obtained from The Dartmouth Atlas, which is funded by the Robert Wood Johnson Foundation and the Dartmouth Clinical and Translational Science Institute, under award number UL1TR001086 from the National Center for Advancing Translational Sciences (NCATS) of the National Institutes of Health (NIH).


HRR Level Discharge Rates, Medicare Beneficiaries with Defibrillator Insertion, Hospitalization Rates, Comprehensive Information on Defibrillator Insertion, Comprehensive Analysis on Defibrillator Insertion, Medicare Population with Defibrillator Insertion, Implantable Defibrillator Insertion Rates, Dartmouth Atlas Project, Medicare Implantable Defibrillator Insertion

Other Titles

Implantable Defibrillator Insertion Rates of Medicare Beneficiaries at HRR Levels 2008-2012, Dartmouth Altas Project Implantable Defibrillator Insertion Rate HRR Level 2008-2012, Medicare Implantable Defibrillator Insertion Rates HRR Level 2008-2012

Data Fields

Name Description Type Constraints
GeoidGeographical divisionintegerlevel : Nominal
State_AbbreviationThe two-letter aabreviation for specific states.string-
CityThe name of city of the specific state.string-
DenominatorDenominator in calculating rateintegerlevel : Ratio
Observed_IndividualsNumber of observed individualintegerlevel : Ratio
Observed_EventsNumber of events observedintegerlevel : Ratio
Expected_EventsNumber of expected eventsnumberlevel : Ratio
Observed_Expected_RatioRatio of observed to expected eventsnumberlevel : Ratio
Crude_RateCrude rate of the eventnumberlevel : Ratio
Adjusted_RateAdjusted rate for the eventnumberlevel : Ratio
Standard_ErrorStandard errornumberlevel : Ratio
Lower_95_Confidence_IntervalLower limit of 95% confidence intervalnumberlevel : Ratio
Upper_95_Confidence_IntervalUpper limit of 95% confidence intervalnumberlevel : Ratio

Data Preview

GeoidState AbbreviationCityDenominatorObserved IndividualsObserved EventsExpected EventsObserved Expected RatioCrude RateAdjusted RateStandard ErrorLower 95 Confidence IntervalUpper 95 Confidence Interval
1AL BIRMINGHAM232118699716700.14453411.022645993.0846379863.1428229250.092582688000000012.9203418963.382253274
2AL DOTHAN49519116116150.99551280.768234752.3425351892.3626259880.1725804911.96937749900000012.8343989730000003
5AL HUNTSVILLE68246146148208.43770030.7100442952.1686252672.1784462390.140886951999999981.8541454112.559469169
6AL MOBILE77816254259238.85481161.0843407273.3283643473.33552526899999970.1631505052.9527057723.767977469
7AL MONTGOMERY40041116116120.312234199999990.9641579742.89703054399999972.97572873100000020.2174074792.4803442593.5700534110000004
9AL TUSCALOOSA27158828483.010308221.01192251700000013.0930112673.12163034600000030.2679602112.5203874753.866300762
10AK ANCHORAGE45406143149143.38524861.0391585013.28150464699999983.17960309800000030.2049723172.7076680273.7337944519999997
11AZ MESA67857332338209.756432500000021.6113927764.9810631184.9309628950.2111840054.4317370415.486425492
12AZ PHOENIX221783701711700.49049151.0150030713.20583633600000043.10574744699999970.091861576999999992.8850317493.3433487189999997
14AZ SUN CITY44878166168143.1456811.1736295423.743482333.5914696320.218055553999999983.08712091600000044.17821474