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

Metadata Updated: July 26, 2023

The Healthcare Cost and Utilization Project (HCUP) State Ambulatory Surgery Databases (SASD) contain the universe of hospital-based ambulatory surgery encounters in participating States. The SASD include encounter-level data for ambulatory surgeries and may also include various types of outpatient services such as observation stays, lithotripsy, radiation therapy, imaging, chemotherapy, and labor and delivery. The specific types of ambulatory surgery and outpatient services included in each SASD vary by State and data year. All SASD include data from hospital-owned ambulatory surgery facilities. In addition, some States include data from nonhospital-owned facilities. 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 the expected payer including but not limited to Medicare, Medicaid, private insurance, self-pay, or those billed as ‘no charge’. Developed through a Federal-State-Industry partnership sponsored by the Agency for Healthcare Research and Quality (AHRQ), HCUP data inform decision making at the national, State, and community levels.

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. In addition to the core set of uniform data elements common to all SASD, some include State-specific data elements. 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 Bureau of Health Professions' Area Resource File except in States that do not allow the release of hospital identifiers.

Restricted access data files are available with a data use agreement and brief online security training.

Access & Use Information

Restricted: This dataset can only be accessed or used under certain conditions. License: See this page for license information.

Downloads & Resources


Metadata Created Date November 10, 2020
Metadata Updated Date July 26, 2023

Metadata Source

Harvested from

Additional Metadata

Resource Type Dataset
Metadata Created Date November 10, 2020
Metadata Updated Date July 26, 2023
Publisher Agency for Healthcare Research and Quality, Department of Health & Human Services
Identifier eabeb3a6-d2d7-43be-b43d-f83414eb7ee1
Data First Published 2021-02-13
Data Last Modified 2023-07-25
Rights N/A
Category State
Public Access Level restricted public
Bureau Code 009:33
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Data Dictionary
Harvest Object Id 60222717-969c-439f-bf84-8d5a1834a5aa
Harvest Source Id 651e43b2-321c-4e4c-b86a-835cfc342cb0
Harvest Source Title
Homepage URL
Program Code 009:072
Source Datajson Identifier True
Source Hash c9a8772f7e12ef8ed5341ad740d679e937e63c21
Source Schema Version 1.1

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