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Accuracy of Medicare reimbursement for cardiac arrest
1Office of Inspector General, US Department of Health and Human Services, Washington, DC 20201.
Insights
Diagnosis Related Group (DRG) 129 coding errors are common, with many patients admitted for other conditions. Accurate principal diagnosis coding is crucial for correct reimbursement and distinguishing causes of death.
Area of Science:
- Health Services Research
- Medical Coding Accuracy
- Healthcare Reimbursement
Background:
- Diagnosis Related Group (DRG) 129 is designated for cardiac arrest (ICD-9 427.5).
- This DRG excludes patients with more specific cardiac diagnoses or those experiencing cardiac arrest after admission for other reasons.
- Accurate coding is essential for healthcare reimbursement and statistical analysis.
Purpose of the Study:
- To evaluate the accuracy of coding for Diagnosis Related Group (DRG) 129.
- To identify the frequency and reasons for coding errors in DRG 129.
- To compare coding error rates of DRG 129 with other DRGs.
Main Methods:
- A one-stage sample design was used to select DRG 129 discharges from random hospitals.
- Medical records specialists reabstracted International Classification of Diseases (ICD) codes from 857 medical records using blinded techniques.
- Physicians classified incorrectly coded bills by clinical situation and error type.
Main Results:
- Diagnosis Related Group (DRG) 129 exhibited significantly higher rates of coding errors and upcoding compared to other DRGs.
- 42.1% of incorrectly coded DRG 129 discharges involved patients admitted for heart disease other than cardiac arrest.
- 55.2% of erroneously billed DRG 129 patients were admitted for conditions unrelated to cardiac arrest.
Conclusions:
- Attending physicians must differentiate between the immediate cause of death for death certificates and the principal diagnosis for billing.
- Coding inaccuracies in DRG 129 can lead to significant reimbursement discrepancies.
- Improved physician education on principal diagnosis selection is needed to enhance coding accuracy.
Abstract:
Diagnosis related group (DRG) 129 consists exclusively of discharges having a principal diagnosis of International Classification of Diseases, Ninth Revision, Clinical Modification code 427.5 (cardiac arrest). It excludes patients with more specific diagnoses (eg, myocardial infarction and arrhythmia) or patients admitted for a different reason and who subsequently experience cardiac arrest. This study used a one-stage sample design to select all DRG 129 discharges from random hospitals, stratified by their annual number of DRG 129 bills. Using blinded techniques, medical records specialists reabstracted the International Classification of Diseases codes for 857 medical records. For the bills that were not coded DRG 129 on reabstraction, physicians classified the incorrect bills by clinical situation and reason for error. Diagnosis related group 129 had significantly higher rates of coding errors and upcoding than other DRGs. Of discharges erroneously billed to DRG 129, 42.1% of the patients entered the hospital for heart disease other than cardiac arrest and 55.2% died after entering the hospital for other diseases. Attending physicians need to distinguish between the "immediate cause" of death for the death certificate and the "principal diagnosis" for reimbursement purposes.