Skip Navigation U.S. Department of Health and Human Services
Agency for Healthcare Research Quality
Archive print banner
National Healthcare Disparities Report, 2005

This information is for reference purposes only. It was current when produced and may now be outdated. Archive material is no longer maintained, and some links may not work. Persons with disabilities having difficulty accessing this information should contact us at: Let us know the nature of the problem, the Web address of what you want, and your contact information.

Please go to for current information.

Medicare Patient Safety Monitoring System (MPSMS)


U.S. Department of Health and Human Services, Centers for Medicare and Medicaid Services (CMS), The Patient Safety Task Force of the Department for Health and Human Services.

Mode of Administration

Chart abstraction using electronic data collection tool. Once medical records are selected from the sample, abstractors use explicit clinical criteria to examine the process of care, ascertain the occurrence of specific adverse events, determine that the event is an adverse event, and assess patient risk factors.

Survey Sample Design

Cross-sectional. The MPSMS data sources are a national random sample of medical records for all Medicare hospital discharges stratified by State and Medicare administrative data.

Primary Content

MPSMS inpatient medical records: a randomly selected, nationwide subset of inpatient medical records from the Medicare Hospital Monitoring Program (HPMP) and Medicare Administrative Data.

The purpose of the system is to identify rates of adverse events in the Medicare population as expressed in medical records and administrative data. Adverse event categories include the following:

  • Adverse events associated with the use of central vascular catheters (CVC)
  • A set of adverse events associated with surgical procedures
  • A set of adverse events associated with joint revisions and replacements
  • Hospital-acquired, ventilator-associated pneumonia
  • Hospital-acquired blood stream infections
  • Adverse drug events that are hospital-associated or the cause of hospital admission (testing begins fall 2002)

The system also collects and examines patient risk factor information, such as demographics, principal diagnosis and its severity, and comorbid conditions and treatments.

Population Targeted

Medicare beneficiaries as required for the relevant measure.

Demographic Data

Age, race, gender.

Years Collected

Since 2002.


Data is collected monthly and aggregated annually.

Geographic Estimates

All States and Puerto Rico.

Contact Information

Agency homepage:

Data system homepage:


Hunt DR, Verzier N, Abend SL, Lyder C, Jaser LJ, Safer N, Davern P. Fundamentals of Medicare Patient Safety Surveillance: Intent, Relevance, and Transparency. Advances in Patient Safety: From Research to Implementation. (Vol. 2), AHRQ Pub. No. 050021-2. February 2005. Agency for Healthcare Research and Quality, Rockville, MD.



The information on this page is archived and provided for reference purposes only.


AHRQ Advancing Excellence in Health Care