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Miscoding as a cause of elevated simple pneumonia mortality.

Hewitt Goodpasture1, Chau-Thuong Nguyen-Dang, Tony H Lee

  • 1Department of Infection Control, Via Christi Regional Medical Center (VCRMC), Wichita, Kansas, USA.

Joint Commission Journal on Quality and Safety
|June 24, 2004
PubMed
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Incorrect coding led to an inflated pneumonia mortality rate. A review found the actual rate was 6.6%, not the reported 11.06%, due to misclassification and documentation issues.

Area of Science:

  • Healthcare Quality Improvement
  • Medical Coding Accuracy

Background:

  • An external report indicated a high mortality rate (11.06%) for simple pneumonia (DRG 89) between 1996-1998.
  • This rate significantly exceeded the medical center's expected mortality surveillance data.
  • Chart review was initiated to investigate the discrepancy in reported mortality rates.

Purpose of the Study:

  • To determine the accuracy of principal diagnosis coding for simple pneumonia.
  • To identify reasons for discrepancies between reported and actual mortality rates.

Main Methods:

  • A retrospective review of 246 patient charts (123 expired, 123 alive).
  • Comparison of originally coded principal diagnoses with recoded diagnoses based on Coding Clinic guidelines.
  • Analysis of coding timing relative to discharge summary dictation.

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Main Results:

  • Only 34.6% of charts were correctly coded as simple pneumonia.
  • Principal diagnoses were frequently miscoded as respiratory failure (13.8%), congestive heart failure (11.4%), and other conditions.
  • Coding preceded discharge summary dictation in 48.4% of cases.
  • The corrected mortality rate for simple pneumonia was determined to be 6.6%.

Conclusions:

  • Inaccurate coding and documentation practices were prevalent.
  • Key issues included confusion between principal and final diagnoses, delayed dictation, and insufficient documentation.
  • These factors contributed to the misrepresentation of the simple pneumonia mortality rate.