The HCUP variable for the hospital's location and teaching status changed names and definitions across data years:
||Beginning in 1998
||More stringent definition of teaching hospital
||Less stringent definition of teaching hospital
||Same as H_LOCTCH
For H_LOCTCH, the hospital's location and teaching status were obtained from the AHA Annual Survey of Hospitals. A metropolitan statistical area is considered urban, and a non-metropolitan statistical area is rural. Teaching hospitals have an AMA-approved residency program or have membership in the Council of Teaching Hospitals.
Note that a few hospitals classified as rural are also teaching hospitals.