Impact of Complications on DRG Assignment for Adult Spinal Deformity Surgery Using the ISSG-AO Classification System.

Area of Science:

• Spine surgery outcomes research
• Healthcare economics and reimbursement

Background:

• Inconsistent complication definitions lead to variable surgical complication rates and inaccurate Diagnosis Related Group (DRG) reimbursement.
• The ISSG-AO Spinal Deformity Complication Classification System (SDCCS) offers improved reproducibility in reporting complications.
• Accurate complication reporting is crucial for appropriate DRG reimbursement.

Purpose of the Study:

• To evaluate the predictive capability of the ISSG-AO SDCCS for DRG coding and associated costs in adult spinal deformity (ASD) patients.
• To determine the relationship between complication severity, DRG assignment, and healthcare expenditures.

Main Methods:

• Retrospective cohort study of ASD patients.
• Patients were categorized into DRG groups based on complication status (none, CC, MCC).
• Complications were graded using the ISSG-AO system; costs were based on Medicare IPPS.

Main Results:

• Patients with interventions were significantly more likely to be classified into higher DRG categories (CC and MCC).
• Increased ISSG-AO scores, higher Edmonton Frailty Scores, longer operative times, and extended lengths of stay correlated with higher DRG assignments and costs.
• Reimbursement increased incrementally across DRG categories, from $49.5K to $70K.

Conclusions:

• The ISSG-AO SDCCS effectively predicts DRG assignment for ASD patients.
• Elevated ISSG-AO scores are associated with higher DRG categorization, longer hospital stays, and increased healthcare costs.
• The SDCCS aids in standardizing complication reporting and predicting patient costs.