HCUP State Ambulatory Surgery Databases (SASD) - Restricted Access Files


The State Ambulatory Surgery Databases (SASD) contain the universe of hospital-based ambulatory surgery encounters in participating States. Some States include ambulatory surgery encounters from free-standing facilities as well. Restricted access data files are available with a data use agreement and brief online security training.

The data are translated into a uniform format to facilitate multi-State comparisons and analyses. The SASD include all patients in participating settings, regardless of payer, e.g., persons covered by Medicare, Medicaid, private insurance, and the uninsured.

The SASD contain clinical and resource use information included in a typical discharge abstract, with safeguards to protect the privacy of individual patients, physicians, and facilities (as required by data sources). Data elements include but are not limited to: diagnoses, procedures, admission and discharge status, patient demographics (e.g., gender, age), total charges, and expected payment source (e.g., Medicare, Medicaid, private insurance, self-pay; for some States, additional discrete payer categories, such as managed care). In addition to the core set of uniform data elements common to all SASD, some include State-specific data elements, such as the patient's race. The SASD exclude data elements that could directly or indirectly identify individuals. For some States, hospital and county identifiers are included that permit linkage to the American Hospital Association Annual Survey File and the Area Resource File.

Agency and Program Information

Agency: Agency for Healthcare Research and Quality
Keywords: ambulatory surgery, claims, diagnoses, hcup, health care, health statistics, hospital, procedures, utilization
Subject: Epidemiology
Subject: Health Care Cost
Subject: Health Care Providers
Group Name: Healthcare Cost and Utilization Project
Date Released: Jan 1, 2001
Date Updated: Dec 1, 2014

Data Collection and Frequency

Collection Frequency: Annually
Coverage Period Start: Jan 1, 1997
Coverage Period End: Dec 31, 2012
Unit of Analysis: ambulatory surgery encounter
Geographic Scope: State, county, ZIP Code (varies by state)
Geographic Granularity: ZIP Code

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