Data Sources—Indian Health Service
2011 National Healthcare Quality and Disparities Reports
National Data Warehouse (NDW)
U.S. Department of Health and Human Services, Indian Health Service (IHS).
NDW is the national repository for all IHS health care data and includes information on patient registration and visit encounters. Data are derived from various government (mostly the Resource Patient Management System or "RPMS") and commercial health care information systems. These are largely transaction-based systems used to support patient care. NDW is an upgraded version of the National Patient Information Reporting System (NPIRS).
NDW includes registration records and all encounter records (dated October 1, 2000, to the present). Registration tables contain patient information, including name, demographic data, medical chart data, aliases, and insurance eligibility data. Encounter tables contain encounter information, including location of treatment, clinic, provider, medications, and diagnosis codes.
NPIRS collects data on approximately 1.5 million American Indians and Alaska Natives who belong to 565 federally recognized tribes in 35 States.
Age, gender, and American Indian and Alaska Native status.
1997 to present.
National IHS service area estimates are available for the following IHS regions: Aberdeen, Alaska, Albuquerque, Bemidji, Billings, Nashville, Navajo, Oklahoma, Phoenix, and Tucson (excluding the Portland and California service areas).
Since no IHS inpatient facilities are located in either the Portland or California service areas, hospitalizations from these regions are not present in the data; the denominator is correspondingly reduced.
Agency home page: http://www.ihs.gov.
Data system home page: http://www.ihs.gov/NDW/
Berger L, Sims G. Identifying polypharmacy among older adults using IHS National Data Warehouse data. IHS Prim Care Provid 2010;35(10).