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Congenital heart disease: interrelation between German diagnosis-related groups system and Aristotle complexity score

Nicodème Sinzobahamvya1, Joachim Photiadis, Claudia Arenz

  • 1Department of Paediatric Cardio-Thoracic Surgery, Congenital Cardiac Centre ('Deutsches Kinderherzzentrum'), Asklepios Clinic, Sankt Augustin, Germany. n.sinzobahamvya@asklepios.com

European Journal of Cardio-Thoracic Surgery : Official Journal of the European Association for Cardio-Thoracic Surgery
|February 9, 2010
PubMed

Insights

The Aristotle comprehensive complexity score (ACC) strongly correlates with German DRG 2009 cost-weights for congenital heart surgery. This suggests ACC can guide hospital reimbursement based on procedure complexity, potentially rewarding surgical quality.

Area of Science:

  • Cardiovascular Surgery
  • Health Economics
  • Medical Information Systems

Background:

  • The Disease-Related Groups (DRG) system aims to align hospital reimbursement with clinical complexity and resource consumption.
  • Applying this to congenital heart surgery, higher procedure complexity should ideally result in higher reimbursement.
  • The Aristotle complexity score quantifies the complexity of congenital heart procedures.

Purpose of the Study:

  • To analyze the correlation between the case-mix index (CMI) generated by the German DRG 2009 system and the Aristotle complexity score for congenital heart surgery.
  • To assess the suitability of the Aristotle score for informing hospital reimbursement in this surgical field.

Main Methods:

  • 456 congenital heart surgery cases from 2008 were analyzed using the German DRG 2009 version.
  • Aristotle Basic and Comprehensive Complexity (ABC and ACC) scores were determined for each case.
  • Spearman correlation coefficients and goodness of fit (r²) were calculated between Aristotle scores and DRG cost-weights (CMI).

Main Results:

  • The mean ABC score was 7.64 and the mean ACC score was 9.27.
  • ACC scores showed a strong positive correlation with cost-weights, with a Spearman's r of 1 and r² of 0.9790.
  • The derived regression equation (y = 0.5591 + 0.939x) indicates a near-perfect fit between ACC level scores and CMI.

Conclusions:

  • The Aristotle Comprehensive Complexity (ACC) score demonstrates a near-perfect correlation with German DRG 2009 cost-weights.
  • ACC scores can serve as a robust basis for hospital reimbursement, accurately reflecting procedure complexity in congenital heart surgery.
  • Reimbursement could be modulated by surgical performance (score times survival) to incentivize quality care.
Abstract

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