CO-232: Institutional Transfer DRG Difference
The DRG transfer amount difference is a contractual adjustment. Verify the per-diem calculation is correct and write off the difference, or appeal if the calculation is wrong.
What Does CO-232 Mean?
CO-232 indicates the DRG transfer payment difference is a contractual adjustment. The transferring hospital receives the per-diem rate rather than the full DRG amount, and the difference is a contractual write-off. This is the expected payment methodology for transfer cases, not an error.
CARC 232 applies exclusively to institutional claims and addresses the payment calculation when a patient is transferred between facilities during an inpatient stay. Under DRG-based payment systems, when a patient is transferred from one institution to another, the transferring hospital typically receives a per-diem payment rather than the full DRG amount, while the final discharging hospital receives the standard DRG payment. Code 232 explains this payment difference.
The transferring hospital's payment is calculated based on the number of days the patient was in their facility, up to the full DRG amount. This means the transferring facility often receives less than the full DRG rate, and CARC 232 communicates the amount of that reduction. The adjustment is a function of CMS transfer payment policy, not necessarily an error on the claim.
This code most commonly appears with Group Code CO (contractual obligation), meaning the payment difference is a contractual adjustment the provider must accept. It can also appear with OA in complex multi-facility transfer scenarios.
Common Causes
| Cause | Frequency |
|---|---|
| Incomplete or inaccurate patient transfer documentation The claim is missing key transfer details such as correct dates of admission and discharge, receiving institution information, or reason for transfer, causing the payer to apply a DRG transfer payment reduction | Most Common |
| Missing medical records demonstrating transfer necessity The claim lacks supporting documentation showing the medical necessity of transferring the patient to another facility, which is required for proper DRG payment calculation across institutions | Common |
| Transfer criteria not met The patient transfer does not meet the payer's clinical criteria for a valid transfer, such as medical necessity or appropriate level of care at the receiving facility, resulting in a DRG payment adjustment | Common |
| Billing errors in DRG calculation across institutions Incorrect coding or miscalculation of the DRG amount difference between the transferring and receiving institutions leads to payment discrepancies | Occasional |
How to Resolve
Verify transfer documentation accuracy, confirm the DRG per-diem calculation is correct, and appeal only if the payment amount is lower than expected under the transfer policy.
- Confirm transfer payment accuracy Verify that the per-diem transfer payment was calculated correctly based on the DRG, average length of stay, and actual days at your facility.
- Check discharge status code Ensure the discharge status code correctly reflects a transfer (status 02, 05, 06, etc.) rather than a discharge, as this directly affects the payment methodology.
- Appeal or accept If the payment calculation is correct, accept the contractual adjustment. If incorrect, submit a corrected claim or appeal with supporting transfer documentation.
Common RARC Pairings
The RARC code tells you exactly what triggered the CO-232:
| RARC | Description |
|---|---|
| M15 | Separately billed services/tests have been bundled as they are considered components of the same procedure. |
| N657 | This transfer amount reflects the DRG payment difference between institutions. |
How to Prevent CO-232
- Ensure transfer documentation is complete before submitting institutional claims
- Verify discharge status codes accurately reflect transfer versus discharge scenarios
- Coordinate with receiving facilities to ensure consistent transfer records
- Train billing staff on DRG transfer payment methodology to set correct payment expectations
General Prevention
- Ensure accurate and complete patient transfer documentation before submitting institutional claims, including all dates, facility details, and clinical rationale
- Establish standardized communication channels between transferring and receiving institutions for timely exchange of records
- Implement EHR-based documentation practices that capture all required transfer fields at the point of care
- Conduct regular audits of institutional transfer claims to identify documentation gaps before submission
- Train staff on DRG transfer payment rules and the specific documentation requirements for multi-institutional claims
Also Filed As
The same CARC 232 may appear with different Group Codes:
Related Denial Codes
Sources
- https://www.mdclarity.com/denial-code/232
- https://x12.org/codes/claim-adjustment-reason-codes
- Codes maintained by X12. Visit x12.org for official definitions.