Adjustment Reason Code can be added from the Claims Lookup sub menu present under the Advanced Setup menu.

From the main menu, click on Advanced Setup and then click on 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.