I was taking the AAPC module that I purchased: Specialty Practice Exam COSC™
And on Case 20 it goes over a basic office visit for knee pain. All that is done is an e/m and an x-ray, 73562.

Question three asks if a modifier should be appended. I chose no, which it says is incorrect, the rational being:

The provider performs an E/M and radiology service. According to NCCI policy, when a provider performs a significant and separately identifiable E/M service with a procedure with XXX global days, append modifier 25 to the E/M service.

I am so confused. I have never used modifier 25 on an OV for just a knee xray since the xray has no gobal?
I would have gotten this wrong on the exam… Can anyone explain why this is correct?
I understand using it in cases with minor procedues like 20610 but an xray??