The 59 modifier allows for reduction because each procedure contains the reimbursement for the prep as well as the procedure. The 59 says this procedure is performed in the same session, there for the prep is then carved out of the reimbursement or as we say discounted.

Does modifier 59 affect payment?

Like modifier 51, modifier 59 also has payment implications. Modifier 51 impacts the payment amount, and modifier 59 affects whether the service will be paid at all. Modifier 59 is typically used to override National Correct Coding Initiative (NCCI) Edits.

When should modifier 59 be appended to a claim?

Modifier 59 should be used to distinguish a different session or patient encounter, or a different procedure or surgery, or a different anatomical site, or a separate injury. It should also be used when an intravenous (IV) protocol calls for two separate IV sites.