ModerateOther Adjustment (OA)Duplicate Claim
OA-18: Duplicate claim/service (other adjustment)
This is a duplicate claim adjustment categorized under Other Adjustment. The claim has been identified as a duplicate of a previously processed claim. The OA group code indicates neither the provider nor the patient is responsible for the adjustment.
Common Causes
- Claim was submitted multiple times by error
- Crossover claim created a duplicate submission
- System-generated resubmission after initial processing
How to Resolve OA-18
- 1Verify the original claim was paid correctly
- 2If this is truly a duplicate, no action needed
- 3If the services are distinct, appeal with documentation differentiating the services
How to Prevent OA-18 Denials
- Track all claim submissions to prevent accidental duplicates
- Monitor crossover claim processing to prevent double-billing
Related Denial Codes
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