Modifier 59 is the modifier of last resort and is only reported when it best explains the circumstances and no other, more descriptive modifier is available.

Modifier 59

Payers may require medical record documentation prior to payment of the services. The medical record documentation must reflect that a distinct procedural service was performed at a different session, was a different procedure or surgery (eg, separate lesion), was performed on a different site or organ system, required a separate incision or excision, or resulted from a separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same physician.

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