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NIS Description of Data Elements
The NIS is set of longitudinal hospital inpatient databases included in the HCUP family. These databases are created by AHRQ through a Federal-State-Industry partnership.
 
PRSYS - Procedure coding system
 
Documentation Sections:
General Notes
Uniform Values
State Specific Notes
General Notes
 

PRSYS indicates the coding system for the procedures:

  • Almost all HCUP inpatient stays use ICD-9-CM procedure codes (PRSYS = 1)
  • If Physicians' Current Procedural Terminology (CPT) or HCFA Common Procedure Coding System (HCPCS) procedure codes are indicated (PRSYS = 2 or 3), then the procedure codes are set to missing (PRn = blank). CPT and HCPCS procedure codes could not be retained in the HCUP data because they are 5 characters, and the HCUP procedure fields (PRn) are 4 characters in length.
  • If the procedure coding system was not specified by the data source, then PRSYS is missing (PRSYS =l .)

The data element PRSYS was discontinued in 1998.

 
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Uniform Values
VariableDescriptionValueValue Description
PRSYSProcedure coding system1ICD-9-CM
2CPT-4
3HCPCS/CPT-4
.Missing
.AInvalid
 
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State Specific Notes

Pennsylvania

The reporting and handling of CPT and HCPCS procedure codes varies by year:

  • Prior to 1995, Pennsylvania supplied only ICD-9-CM procedure codes (PRSYS = 1).
  • From 1995-1996, Pennsylvania supplied a mixture of ICD-9-CM, CPT and HCPCS codes. PRSYS which identifies the procedure coding system was assigned based on the value reported by the data source (PRSYS = 1, 2, or 3).
  • In 1997, Pennsylvania source documentation indicated that all procedure codes were ICD-9-CM codes (PRSYS = 1).. Any procedure codes that were suspected of being CPT or HCPCS codes were masked during HCUP processing.
  • Beginning in 1998, Pennsylvania supplied only ICD-9-CM procedure codes.

See the Pennsylvania note on procedures (PRn) for more specific details.



Pennsylvania

Prior to 1995, CPT and HCPCS procedure codes were not included in the Pennsylvania data.

From 1995-1996, the number of discharges for which the procedure coding system indicated that the procedures were CPT or HCPCS (PRSYS = 2 or 3) follows:

  • NIS, Release 4 (1995 data) has no records.
  • NIS, Release 5 (1996 data) has 1,711 records.

In 1997, CPT and HCPCS procedure codes do not occur in the data supplied by Pennsylvania.


 
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Internet Citation: HCUP NIS Description of Data Elements. Healthcare Cost and Utilization Project (HCUP). September 2008. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/vars/prsys/nisnote.jsp.
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Last modified 9/17/08