To add Adjustment Reason Codes go to Advanced Setup-> Claim Lookups. On the Search Claim Lookups screen, click on the button to add a new Claim Lookups. A new claim lookup window opens up for configuring adjustment reason codes. Enter the Type by selecting and choosing ‘Adjustment_Reason_Code’ from the list. Enter the new reason into the fields named – Code, Code Description, Value, and Value Description. Keep the User Editable field checked, if the value needs to be edited later. Hit the button to add the lookup value.