| PRDAYn - Number of days from admission to procedure n |
| Documentation Sections: |
| General Notes |
| Uniform Values |
| State Specific Notes |
| General Notes |
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The day on which the procedure is performed (PRDAYn) is calculated from the procedure date (PRDATEn) and the admission date (ADATE) with the following exceptions:
Edit checks ED7nn are only performed on the 1988-1997 data. Beginning in the 1998 data, the procedure date without a coded procedure is discarded. The procedure date vector (PRDATEn) is shifted with the ICD-9-CM procedure codes (PRn) when the procedure vector is packed. Some sources do not require procedure dates/days for minor or diagnostic procedures which are considered UHDDS class 3 and class 4 procedures. The UHDDS system grouped ICD-9-CM procedure codes into four classes differentiated by impact on either the well-being of the patient or on the health care system. The criteria used to classify procedures included procedural risk, anesthetic risk, and the need for highly trained personnel, special facilities or special equipment. The classes are:
PRDAY1 is present on the NIS from 1988 onward; secondary procedures (PRDAY2-15) are present on the NIS beginning in 1998. |
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| Uniform Values | ||||||||||||||||||||
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| State Specific Notes |
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Colorado Beginning in 2010, Colorado began supplying secondary procedure dates. These fields are used to calculate PRDAYn. Prior to 2010, only PRDAY1 is available because Colorado did not report secondary procedure days or dates. Only the calculated day of principal procedure could be used to assign PRDAY1 because Colorado did not supply principal procedure day. Indiana Prior to 2010, only PRDAY1 is available because Indiana did not report secondary procedure days or dates. Beginning in 2010, Indiana started supplying secondary procedure dates. Only the calculated day of procedure could be used to assign PRDAYn because Indiana did not supply this information. Minnesota Only the calculated day of procedure could be used to assign PRDAYn because Minnesota did not supply day of procedure. Missouri Missouri reports a mixture of ICD-9-CM procedure codes (3-4 digit codes) and CPT-4/HCPCS procedure codes (5 digit codes) in one array in their ambulatory surgery files. The reported procedures are split into the HCUP array that holds ICD-9-CM procedures (PRn) and the HCUP array that holds CPT-4/HCPCS procedures (CPTn), as appropriate. The principal procedure is retained in the principal position:
The secondary procedures are packed into the secondary procedures so that there are no gaps in the HCUP arrays:
No secondary procedures are placed into the principal position. Only the procedure dates for the ICD-9-CM procedures could be retained on the HCUP files in the array PRDATEn. Procedure days (PRDAYn) for the ICD-9-CM procedures are calculated from the reported procedure dates and admission date. Nebraska Only the calculated day of procedure could be used to assign PRDAYn because Nebraska did not supply day of procedure. Nebraska Beginning in 2009, Nebraska no longer provides ICD-9-CM procedure codes. New Jersey Only the calculated day of procedure could be used to assign PRDAY because New Jersey did not supply the day of procedure. New York Beginning with the 2008 data, ICD-9-CM procedure codes were 100% missing and will no longer be available. Beginning with the 2008 data, the HCUP data element PRDAYn is missing (.) for AIDS/HIV patients. New York identifies AIDS/HIV records by ICD-9-CM diagnosis code, DRG, or MS-DRG:
Please note that the admitting diagnosis is not retained in the HCUP databases prior to 2012. Utah Only the calculated day of procedure could be used to assign PRDAYn because Utah did not report day of procedure. Wisconsin Principal procedure day is only required for major procedures (defined below). Procedure days are set to missing for all other cases. Major procedures are defined as Class 1 or 2 procedures. The UHDDS system grouped ICD-9-CM procedure codes into four classes differentiated by impact on either the well-being of the patient or on the health care system. The criteria used to classify procedures included procedural risk, anesthetic risk, and the need for highly trained personnel, special facilities or special equipment. The classes are:
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| Internet Citation: HCUP Central Distributor SASD Description of Data Elements - All States. Healthcare Cost and Utilization Project (HCUP). October 2024. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/vars/sasddistnote.jsp?var=prdayn. |
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