The diagnosis codes recorded on a fee slip (up to 12 codes) will appear in box 21 on the CMS 1500 form.
In box 24E on the CMS 1500 form, the diagnosis pointer (A B C D or any combination of these letters) referencing the line number(s) from box 21 will appear. You should reference the primary diagnosis code first, then the secondary diagnosis code, and so on.
Because multiple ICD-10 codes can be associated with one procedure code, you may need to manually record additional diagnosis pointers in box 24E to ensure that the procedure codes in box 24D have all of the necessary diagnosis codes from box 21 associated to them. Currently, only one diagnosis pointer is automatically recorded on the CMS 1500 form for each procedure code on the fee slip. Eyefinity is working to automate this process and automatically add additional diagnosis pointers in a future release.
Recording all appropriate diagnosis pointers (up to four) in box 24E will ensure that your claims are complete.