Box 21 - Diagnosis or Nature of Illness or Injury

Box Definition 

Box 21 on the CMS-1500 form is used to indicate the patient's diagnosis codes.

In Kipu RCM

Let's review how to update Box 21 in the RCM!

• The patient's diagnosis on a CMS-1500 is managed through the Attendance Calendar. For more information on managing attendance, click here. 
• You can add or remove a diagnosis on a claim using a Claim Form Rule. 
• You can alter a diagnosis on a claim before submitting it using our Claim Edits feature. To learn more about this feature, click here.

EDI Loop and Segment

Loop 2300, Segment HI. For additional information on loops and segments, click here.