Skip to content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Skip to content

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

Metadata Updated: June 8, 2022

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 June 8, 2022

Metadata Source

Harvested from

Additional Metadata

Resource Type Dataset
Metadata Created Date November 10, 2020
Metadata Updated Date June 8, 2022
Publisher Agency for Healthcare Research and Quality, Department of Health & Human Services
Unique Identifier Unknown
Identifier eabeb3a6-d2d7-43be-b43d-f83414eb7ee1
Data First Published 2021-02-13
Data Last Modified 2022-06-07
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 bf168081-d065-4f51-bfc3-c9575119da51
Harvest Source Id 651e43b2-321c-4e4c-b86a-835cfc342cb0
Harvest Source Title
Homepage URL
Program Code 009:072
Source Datajson Identifier True
Source Hash 25140fd20f486e3115e2301fc8dae93b8a6da4e0
Source Schema Version 1.1

Didn't find what you're looking for? Suggest a dataset here.