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Central Distributor SID: Description of Data Elements

HCUP_OS - HCUP indicator of observation stay record
Documentation Sections:
General Notes
Uniform Values
State Specific Notes
General Notes

HCUP_OS indicates records that have evidence of observation stay (OS) services reported on the HCUP record. A value of 1 or greater indicates that there is evidence of OS. A value of 0 marks records that do not include evidence of OS. It is possible that records with HCUP_OS=0 did in fact have OS services, but that information was not captured on the HCUP record.

The criteria used to identify OS services has changed over time. Evidence of OS includes:

  • Observation Stay revenue code of 762 on record.
  • Positive observation stay charge, when revenue center codes are not available.
  • Observation stay CPT codes reported on record.
    • 99217-99220 hospital observation services
    • 99224-99226 (added in data year 2018)
    • 99234-99236 observation or inpatient care services including admission and discharge services
    • G0378 Hospital observation service (added in data year 2010)
    • G0379 Direct admission of patient for hospital observation care.
  • From data year 2010-2013, revenue code of 760 (General Classification - Treatment/Observation Room) reported on record with an observation stay CPT code.
Uniform Values
VariableDescriptionValueValue Description
HCUP_OSHCUP indicator of observation stay record0Record does not meet any HCUP Observation Stay criteria
1Observation Stay revenue code on record
2Positive Observation Stay charge (when revenue center codes are not available)
3Until data year 2009: Observation Stay CPT procedure code on record
32010-2013: Revenue code 760 with observation stay CPT/HCPCS procedure code
4Starting in data year 2010: Observation Stay CPT procedure code on record
State Specific Notes



Internet Citation: HCUP Central Distributor SID Description of Data Elements - All States. Healthcare Cost and Utilization Project (HCUP). May 2024. Agency for Healthcare Research and Quality, Rockville, MD.
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Last modified 5/22/24