When an additional procedure is performed through a separate incision, which normally would not be reportable but is appropriate to report in the particular circumstance, the coder should append modifier:

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Modifier -59 is used to indicate a distinct procedural service, signifying that a procedure or service was distinct or independent from other services performed on the same day. This includes instances where an additional procedure is performed through a separate incision.

When an Additional Procedure Is Performed Through a Separate Incision