New invoicing items can be easily created from the Medicare Benefits Schedule items using the 'Make Codes' option in Setup > Financial > Charges > Invoice Items.

You are able to select either a single item of a range of items from the Medicare list.

A short video (2.04mins) demonstrates the steps to perform this function. 

http://incisivesupport.com/train/vid/Invoice_MakeItemsFromMedicare.mp4 

Note: 

You are better to run the 'Make Codes' option several times with smaller ranges of Medicare Item numbers rather than enter one large range, i.e. 30,000 to 70,000. The latter would result in Invoice Codes being made for all Medicare Item numbers in the range and will markedly slow down the invoicing system for you.  Once the range of items have been imported they can only be deleted individually.

Only import the Medicare Item numbers that you require for your specialty or sub specialty. More can be added if necessary.