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Effects of Colorectal Surgery Classification on Reported Postoperative Surgical Site Infections.

William C Kethman1, Elizabeth A Shelton2, Cindy Kin1

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Summary
This summary is machine-generated.

Current procedural terminology codes misclassify colorectal surgeries, impacting quality metrics like surgical site infection (SSI) rates. A new semiautomated reclassification method improved accuracy and identified lower SSI rates for colectomies.

Keywords:
CPTNSQIPSurgical site infection

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Area of Science:

  • Colorectal Surgery
  • Surgical Quality Improvement
  • Health Informatics

Background:

  • Current Procedural Terminology (CPT) codes lack granularity for colorectal procedures, leading to unknown misclassification rates.
  • These codes are used for performance measurement, including surgical site infection (SSI) rates.
  • The accuracy of American College of Surgeons National Surgical Quality Improvement Program (NSQIP) abstraction methods in classifying colorectal operations and reported SSI rates is uncertain.

Purpose of the Study:

  • To evaluate the accuracy of NSQIP abstraction methods in classifying colorectal operations.
  • To compare perioperative surgical site infection (SSI) rates based on different classification methods.
  • To assess the impact of improved procedural classification on outcomes analysis in colorectal surgery.

Main Methods:

  • Retrospective study at a single tertiary care center.
  • Semiautomated reclassification (SAR) of colectomy and proctectomy cases from the NSQIP database (January 2011–July 2016).
  • Comparison of SSI rates between NSQIP classification and SAR-based classification.

Main Results:

  • A total of 1,063 patients underwent colectomy or proctectomy.
  • The SAR method reclassified 23.4% of cases, identifying 650 colectomies and 413 proctectomies, differing significantly from NSQIP's 849 colectomies and 214 proctectomies (P < 0.001).
  • Cases classified as colectomy by SAR showed a lower rate of deep/organ space infections (4.5%) compared to those classified by NSQIP (7.1%, P = 0.034).

Conclusions:

  • CPT code-based patient classification presents challenges for accurate outcomes analysis in colorectal surgery.
  • Enhancing the CPT system to better represent colorectal operations is crucial for more representative reported outcomes.
  • Improved classification accuracy can facilitate more effective benchmarking and quality improvement initiatives in surgical quality.