OA-A5: Medicare PPS Capital Cost Outlier Amount

What Does OA-A5 Mean?

OA-A5 may appear when the capital cost outlier adjustment involves coordination with other payers or special payment circumstances that do not fit strictly under contractual obligation. This is uncommon and typically occurs in unique payment scenarios.

When CARC A5 appears on a remittance, Medicare is communicating the capital cost outlier amount calculated for an inpatient hospital stay under the Prospective Payment System (PPS). The PPS pays hospitals a predetermined rate based on the DRG assignment, but when a case's costs significantly exceed the expected payment, Medicare may provide an additional outlier payment for the capital-related portion of those costs.

The capital cost outlier is separate from the operating cost outlier. It specifically addresses the capital-related expenses — building depreciation, equipment costs, and other facility-related overhead — that exceed the threshold for the assigned DRG. Medicare calculates this amount using the hospital's cost-to-charge ratio applied to the total charges, then determines whether the case qualifies for an outlier payment based on a predetermined threshold.

CARC A5 does not necessarily mean a denial. It may reflect the calculation of the outlier amount — either an additional payment or an adjustment to a previously estimated outlier. If you believe the DRG assignment is incorrect or the cost-to-charge ratio applied does not reflect your facility's actual costs, you can appeal the calculation. However, if the adjustment is a correct application of Medicare PPS rules, it should be accepted as a contractual adjustment.

How to Resolve

Review the DRG assignment and Medicare's outlier calculation, then accept the adjustment or appeal if the calculation appears incorrect.

1. Review the payment context Determine why the OA group code was used instead of CO. Contact Medicare if the adjustment context is unclear.
2. Post the adjustment Record the adjustment based on the specific payment scenario identified.

Common RARC Pairings

The RARC code tells you exactly what triggered the OA-A5:

How to Prevent OA-A5

• Monitor PPS outlier payment methodologies for any changes that might affect group code assignments

Also Filed As

The same CARC A5 may appear with different Group Codes:

Related Denial Codes