The Procedure Code - Do Not Bill Flag will affect the Claims screen by placing a strikethrough line through the Procedure Code when the code is set to 'Do Not Bill.' If you see a code displayed with a line through it then that code will not be billed out on a Claim or on a Statement.
This setting can be changed from the Claim deatils screen by right-clicking on the Procedure line and selecting the Billing option. Selecting this will toggle the 'Do Not Bill' flag on/off for only this claim, based on its current status.