= Adjustment Reason Codes = These codes are used to identify the type and source for why the adjustment is needed. || Adjudication processing error || || EDI/Entry error || || Contract information loaded Incorrect || || Contract- Update information received after effective date of contract || || Contract- Incorrect payment percentage applied to claim || || Eligibility-Incorrect eligibility information received || || Eligibility-Incorrect eligibility information loaded in system || || Corrected billing received || || Duplicate adjustment request ||