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Montana Hospital Discharge Data System

Montana Hospital Discharge
Data System

The Hospital Discharge Data System provides access to inpatient hospitalization data provided by the Montana Hospital Association, based on the Uniform Billing 2004 form UB-04. The Montana Hospital Discharge Data System provides support to employees of Montana DPHHS, and summary statistics and analysis to the general public.


The Montana Hospital Discharge Data System recently signed an agreement with the Montana Hospital Association to access emergency department (ED) data from participating Montana providers. With this agreement, Montana joins the more than 25 states that already have ED data systems. The updated data dictionary provides a description of Montana ED data, along with similarities and differences from inpatient admission data.


For further information, please contact Laura Williamson, State Epidemiologist, Hospital Discharge Data System.

Surveillance Reports

  • Neonatal Abstinence Syndrome in Montana Newborns, 2000-2013 (March 2015)
  • Comparisons of Hospitalizations for Selected Chronic Diseases by Alcohol Abuse Status, Montana, 2009-2013 (March 2015)
  • Emergency Department Encounters and Inpatient Admissions for Injuries from Outdoor Recreational Activities (Jan 2015)
  • Emergency Department Pediatric Encounters for Non-Urgent Conditions (Nov 2014)
  • Emergency Department Encounters for Dental Related Conditions, Montana, 2010-2012 (Mar 2014)
  • Comparisons of Hospitalizations for Selected Cardiovascular and Respiratory Disease by Tobacco Use Status, Montana, 2008-2011 (Nov 2013)
  • Update: Avoidable Hospitalizations for Ambulatory-Care-Sensitive Conditions in Montana Adults, 2004-2012 (September 2013)
  • Under-Ascertainment of Alcohol Involvement in Vehicle Crash Deaths on Montana Death Certificates, 2012 (Jul 2013)
  • Admissions For Total Knee Replacement In Montana, 2002-2011 (June 2013)
  • Reading the Literals: Searching For Expression in Text of Death Certificates In Montana, 2003-2010 (October 2012)
  • Hepatitis C in Montana Hospitalizations, 2000-2011 (August 2012)
  • Results of the E-Code Quality Improvement Project, Phase II, 2012 (August 2012)
  • Staphylococcus aureus Infections in Montana Hospital Admissions, 2000-2011 (July 2012)
  • Hospitalizations for Heat-Related Illnesses in Montana, 2001-2010 (May 2012)
  • Trends In Hospitalization With An Obesity Code, Montana 2001-2010 (April 2012)
  • Multiple Births in Montana, 2011-2010 (Sept 2011)
  • Results of the E-Code Quality Improvement Survey, 2011 (July 2011)
  • Hospitalizations In Montana Due To Injuries Caused By Animals, 2000-2009 (July 2011)
  • Traumatic Amputations In Montana, 2000-2009 (Jan 2011)
  • MHDDS adds Montana State Hospital Adult Mental Health Discharges (Dec 2010)
  • Declining Rates of Circumcisions in Montana, 2000-2008 (Oct 2010)
  • Potentially Avoidable Hospitalizations For Chronic Disease In Montana, 2000-2008 (Aug 2010)
  • Extremity Amputations in Montana 2000-2008 (June 2010)
  • In-Hospital Mortality From Acute Myocardial Infarction in Montana 2000-2008 (June 2010)
  • Hospitalizations for Cardiovascular Diseases in Montana 2000 - 2008 (May 2010)
  • Carbon Monoxide in Montana (Feb 2010)
  • Introduction of Hospital Discharge (Nov 2009)


  • Firework Injuries in Montana (July 2015)
  • Air Quality and Claims for Asthma Visits to Medicaid Providers, Lewis & Clark County, August 2009 - February 2012 (Nov 2012)
  • Age Distributions of the Resident Population of Montana and the United States by Age, April 1, 2010 (Nov 2012)

Special Reports

  • Neonatal Abstinence Syndrome in Montana Newborns 2008-2014 (Dec 2015: Fact Sheet)
  • Non-Fatal Abusive Head Trauma in Infants, Montana, 2010-2014 (Nov 2015: Fact Sheet)
  • January Public Health Quiz: Hospital Admissions and Emergency Department Visits (Jan 2015; Prevention Opportunities)
  • Asthma Emergency Department Visits: Variation in Acute Asthma Exacerbations (Jan 2015; Montana Asthma Control Program)
  • Update: Unintentional, Non-Fire Related Carbon Monoxide Poisoning in Montana, 2010 – 2013 (Dec 2014; Prevention Opportunities)
  • Emergency Department Utilization Among Montana Adults with Diabetes (Dec 2014; Montana Diabetes Program)
  • Poisoning Deaths Attributed to Prescription Drugs, Montana Residents, 2003 – 2012 (August 2014)
  • Record Linkage Between Montana Highway Patrol And Montana Vital Statistics Data, 2008-2011 (February 2013)
  • Montana Prevention Quality Indicators 2000 – 2009
  • Differences Between the Montana Hospital Discharge Data System and the Montana Central Tumor Registry in the Enumeration of Prostate Cancer Cases and the Description of Treatment Practices


  • Comparability of Cause of Death Between ICD-9 and ICD-10; Preliminary Estimates (NCHS)
  • Data Dictionary – MHDDS (Mar 2015 Revision)
  • Data Dictionary – Bridged Race Population Estimates (Sept 2014 Revision)
  • Access Policy
  • Confidentiality Guidelines


  • Dataset Orientation for Montana DPHHS - Public Health and Safety Division (August 2015)  (October AAPC Version)
  • ICD-10 Transition: Challenges and Opportunities for the 21st Century (May 2015)
  • The Montana Diabetes Program's Use of MHDDS Data for Hospitalizations and Emergency Department Visits Among Montanans with Diabetes (March 2015)
  • Users Group Meeting (March 2014)
  • Montana’s Future Population & Hospital Costs (Nov 2013)