Nationwide Ambulatory Surgery Sample (NASS)
Organization
Agency for Healthcare Research and Quality (AHRQ), HHS
Description
- HIPPA-compliant, encounter-level
- Largest all-payer ambulatory surgery database in US. Yields national estimates of major ambulatory surgery encounters performed in hospital-owned facilities
- Three data files per year (Encounter, Hospital, Supplemental)
Vintage/Release Frequency
Annual since 2016
Observational Unit
Ambulatory surgery encounter
Collection Methodology
- Sampled from the State Ambulatory Surgery and Services Databases (SASD).
- Data from 2,699 hospital-owned facilities located in 31 States and the District of Columbia, approximating a 63-percent stratified sample of U.S. hospital-owned facilities performing selected ambulatory surgeries
- Stratification is based on geographic region, trauma center designation, urban-rural location, teaching hospitals and hospital ownership or control.
Available at
Available for purchase by year. CPHR has 2016-2019 data.
Proposal or Application required?
Application form required
Special Notes
- Query and classify patients using ICD-10 and/or CPT
- You cannot track a particular patient across multiple encounters
- All users must complete a Data Use Agreement Training and sign a DUA
- Before publishing with any HCUP database, ensure manuscript follows requirements of the HCUP DUA and includes the appropriate citation (see https://www.hcup- us.ahrq.gov/db/publishing.jsp)