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NASS File Specifications

The Nationwide Ambulatory Surgery Sample (NASS) comprises three files in comma separated value (CSV) format: Encounter File, Hospital File, and Supplemental File. The following links provide file specifications for the NASS including the dataset name, number of records, and record layout for the comma-separated values (CSV) files.
 
2019 NASS

Encounter File Hospital File Supplemental File Diagnosis and Procedure Groups File
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2018 NASS

Encounter File Hospital File Supplemental File Diagnosis and Procedure Groups File
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2017 NASS

Encounter File Hospital File Supplemental File
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2016 NASS

Encounter File Hospital File Supplemental File
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Internet Citation: NASS File Specifications. Healthcare Cost and Utilization Project (HCUP). September 2021. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/nation/nass/nassfilespecs.jsp.
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Last modified 9/27/21