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NASS Description of Data Elements
The Nationwide Ambulatory Surgery Sample (NASS) is a set of ambulatory surgery databases included in the HCUP family. These databases are created by AHRQ through a Federal-State-Industry partnership.
 
TOTAL_AS_ENCOUNTERS - AS encounters with at least one narrow surgery
 
Documentation Sections:
General Notes
Uniform Values
General Notes
 

TOTAL_AS_ENCOUNTERS indicates the total number of AS encounter records from this hospital with at least one narrow or "major" surgery.

HCUP Surgery Flag Software for Services and Procedures was used to identify surgical procedures of interest for the NASS. The Surgery Flag Software processes CPT procedure codes and classifies them as narrow, broad, or neither. The NASS focuses on surgeries in the narrow class, or major ambulatory surgeries. The narrowly defined flag (narrow flag) is the most targeted and restrictive surgical identifier, consisting of invasive therapeutic surgical procedures. A "narrow" procedure (1) involves incision, excision, manipulation, or suturing of tissue that penetrates or breaks the skin; (2) typically requires use of an operating room; and (3) requires regional anesthesia, general anesthesia, or sedation to control pain.

 
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Uniform Values
VariableDescriptionValueValue Description
TOTAL_AS_ENCOUNTERSAS encounters with at least one narrow surgeryNNNNNAS encounters with at least one narrow surgery
 
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Internet Citation: HCUP NASS Description of Data Elements. Healthcare Cost and Utilization Project (HCUP). August 2019. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/vars/total_as_encounters/nassnote.jsp.
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Last modified 8/14/19