Click on Advanced Setup from the main menu and then choose Favorite Diag. Codes.
The Search Diagnosis screen will appear as shown below.
An existing diagnosis code can be searched by typing the diagnosis code in the ICD CODE field or by typing the code description in the Description field.
To add a new diagnosis code to the existing list, click on the 
button which will open up the section to add new diagnosis code as shown below.
Now enter the code in the ICD CODE field and the code description in the Description field. Select the ICD Type as ICD 10, keep the Active(Y/N) checkbox selected and then click on Update.