April 22, 2015 - Updated 03.01.16

HCPCS Modifier PO

The following resources describe the policies related to billing HCPCS modifier PO (Services, procedures and/or surgeries performed at off-campus provider-based outpatient departments). Any additional instructions and/or clarifications received from CMS will be included in this document and on the CGS website as they are received.



Effective January 1, 2015, the definition of modifier PO is "Services, procedures, and/or surgeries furnished at off-campus provider-based outpatient departments." This modifier is to be reported with every HCPCS code for outpatient hospital services furnished in an off-campus provider-based department of a hospital. See 42 CFR 413.65(a)(2) for a definition of "campus".

This modifier should not be reported for remote locations of a hospital (defined at 42 CFR 413.65(a)(2)External Website), satellite facilities of a hospital (defined at 42 CFR 412.22(h)External Website), or for services furnished in an emergency department.

Reporting of this modifier is voluntary for CY 2015; reporting of this modifier is required beginning January 1, 2016.


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