Did you know that you might be triggering claim denials for services rendered at your off-campus hospital departments due to a missing PN modifier?
If this is news to you, this blog will enlighten you!
It covers everything you need to know about the modifier PN, from its descriptor to clinical scenarios and billing guidelines. That’s not all; it also presents a detailed comparison of the PN and PO modifiers.
So, continue reading!
PN Modifier – Description
The Centers for Medicare and Medicaid Services (CMS) introduced the PN modifier to implement site-neutral payments under Section 603 of the Bipartisan Budget Act of 2015.
But what purpose does it serve? For the unversed, it ensures that Medicare reimburses at the same rate for services regardless of whether they are performed in a physician’s office or a newer hospital-owned off-campus clinic.
This modifier alerts Medicare to reimburse the facility at the lower PFS rate (approximately 40%) rather than the higher hospital outpatient rate.
Scenarios Where PN Modifier is Applicable
Let’s review a few real-world clinical scenarios where modifier PN applies:
New Off-Campus Urgent Care Facility
Picture a large health system that opened a new off-campus urgent care clinic approximately three miles away from the main hospital campus.
At that new clinic, a Medicare patient presents with a severe laceration requiring complex repair.
Now, while billing for the care services rendered to this Medicare beneficiary, the facility must append the PN modifier. The reason? This location was established after the Bipartisan Budget Act of 2015. Besides, it is not on the main campus.
Relocation of an Existing Department
Assume a hospital-based oncology clinic was grandfathered (excepted) because it had been operating since 2010.
However, in 2023, the hospital moved the clinic to a new, larger building 12 miles away to cater to increased patient volume.
Since CMS considers a relocated department to lose its grandfathered status, you must bill chemotherapy administration services with the PN modifier.
Acquisition of a Private Physician Practice
Imagine a hospital that purchased a private cardiology practice in 2024. The hospital then converted it into a hospital outpatient department.
Note that this new department is six miles (in a different zip code) from the hospital and has never billed a service as a hospital outpatient department before 2015. Thus, all facility-level services rendered at this newly acquired site, including echocardiography, must be reported with the PN modifier.
PN Modifier – Billing Guidelines
The following are the essential billing guidelines for accurate usage of modifier PN:
Understand When You Should Use the PN Modifier
Discussed below is the key criterion where this modifier applies:
- It applies to all off-campus provider-based departments (PBD) that started billing Medicare on or after November 2, 2015.
- Use it if a grandfathered (excepted) department moves to a new physical location. That is, once moved, the department loses its ‘excepted’ status. Thus, the PN modifier must be appended.
- There may be scenarios where an excepted location adds a newly completed category of service. For instance, an existing imaging-only center began oncology services after the 2015 cutoff.
- When a hospital acquires a private practice after November 2015 and converts it into a PBD.
Know When NOT to Append Modifier PN
Now that you know where to append the PN modifier, it is time to understand when to avoid using it. So, here we go:
- Any facility located within 250 yards of the main hospital’s buildings is considered an on-campus department, i.e., you cannot use modifier PN.
- Locations that were already billing as hospital departments before November 2, 2015, and have not moved or changed status, cannot bill with the PN modifier. Use modifier PO instead.
- Services provided in a dedicated hospital emergency department are exempt from these site-neutral payment reductions.
- Rural Health Clinics and Federally Qualified Health Centers (FQHCs) have different payment structures. Thus, they cannot report services with the PN/PO modifiers.
Fulfill Documentation Requirements
Your documentation must support the use of the PN modifier. Here’s what it should include:
- Include the correct place of service (POS) code with this modifier. For instance, POS 19 is commonly used with the modifier PN. It indicates that the provider rendered the service at an off-campus outpatient hospital.
- Clearly document the physical address where the encounter occurred to justify the site-neutral payment rate.
- The address on the medical claim form must match the specific non-excepted location registered in the provider enrollment, chain, and ownership system (PECOS).
- The PN modifier is appended to a facility/institutional claim and not a professional (CMS-1500) claim form.
PN vs. PO Modifier
The table below offers an at-a-glance view of the key differences between modifiers PO and PN:
| PN Modifier | PO Modifier | |
|---|---|---|
| Establishment Date | On or after November 2, 2015. | Before November 2, 2015. |
| Payment System | Physician Fee Schedule (PFS). | Outpatient Prospective Payment System (OPPS). |
| Reimbursement Level | 40% of the hospital outpatient rates. | 100% of the hospital outpatient rate. |
| Requirement | Mandatory for non-excepted off-campus sites | Mandatory for excepted off-campus sites. |
Modifier PO indicates that the off-campus PBD was already billing Medicare for services before the Bipartisan Budget Act of 2015.
Contrarily, the PN modifier highlights that the off-campus PBD was established after the 2015 cutoff. Or an older facility lost its grandfathered status through a change in ownership or certain types of relocation.
Partner with MediBillMD to Ensure Error-Free Billing
Phew! That was a detailed guide.
The PN modifier identifies non-excepted services at off-campus hospital departments established after November 2, 2025. It triggers reduced site-neutral payment under the PFS.
Many times, while billing for services rendered at off-site hospital departments, the billing staff gets confused between the modifiers PN and PO. This results in a higher denial rate and audit risks.
Thus, if you want to steer clear of these financial risks, consider outsourcing medical billing services to professionals at MediBillMD.
