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Central Distributor SID: Description of Data Elements
This section describes how HCUP data elements are coded, restrictions on their use, their uniform values, and State-specific coding practices.
CPTDAYn - Day of CPT procedure
Documentation Sections:
General Notes
Uniform Values
State Specific Notes
General Notes

The day on which the CPT procedure is performed (CPTDAYn) is calculated from the procedure date and the admission date (ADATE) with the following exceptions:

  • CPTDAYn is missing (.) if the procedure day cannot be calculated from dates or obtained from a supplied day of CPT procedure.
  • CPTDAYn is invalid (.A) if the procedure day cannot be calculated and the supplied procedure day is nonnumeric.
  • CPTDAYn is inconsistent (.C) if the day of procedure is not during the stay (ECPTD01).
Uniform Values
VariableDescriptionValueValue Description
CPTDAYnDay of CPT procedure-4 - -1Days prior to Admission
0Day of Admission
1 - LOS+3Days after Admission
State Specific Notes



Internet Citation: HCUP Central Distributor SID Description of Data Elements - All States. Healthcare Cost and Utilization Project (HCUP). August 2008. Agency for Healthcare Research and Quality, Rockville, MD.
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Last modified 8/12/08