Did you know that there were 11,847 rural family physicians in 2017 and 10,544 in 2023? This accounts for a net loss of 11% of family physicians nationwide in rural areas.
Because of the shortage of physicians, people in rural areas often turn to non-physician practitioners (NPPs) for care delivery. Besides, this mostly happens in Critical Access Hospitals (CAHs).
That’s where the GF modifier comes into play! This guide discusses everything you need to know about it, from clinical scenarios to accurate usage guidelines. So, continue reading!
GF Modifier – Description
The GF modifier is an HCPCS Level II modifier that indicates that an NPP, such as a nurse practitioner (NP), physician assistant (PA), or clinical nurse specialist (CNS), delivered the care service.
You can report this modifier on institutional claims (UB-04) by CAHs operating under Method II billing.
Moreover, note that you can only append these to procedure codes that come under the revenue codes 096X-098X.
Appropriate Use Cases for GF Modifier
Let’s review some of the real-world clinical scenarios where the GF modifier applies:
Wound Care by a Physician Assistant
Picture a 66-year-old female Medicare patient with an infected lower leg laceration. She visits an outpatient department of a Method II CAH for debridement.
At the facility, a PA performs surgical wound debridement. The PA handles devitalized tissue removal down to the muscle and dressing application. Besides, he guides the patient on care instructions before sending her home.
Here, the GF modifier applies.
Chronic Condition Management by a Nurse Practitioner
Assume a 69-year-old male Medicare patient with uncontrolled type 2 diabetes and hypertension. He comes to the outpatient department of a Method II CAH for a routine follow-up encounter.
During the visit, an NP evaluates the patient, reviews recent A1C lab results, adjusts insulin dosages, and documents the encounter.
Thus, you must append the GF modifier to the evaluation and management (E/M) code.
Mental Health Management by a Clinical Nurse Specialist
Imagine a 65-year-old female Medicare patient who has recently been discharged from an outpatient behavioral health unit at a Method II CAH. She is undergoing follow-up care for major depressive disorder.
During one of the sessions, a CNS conducts a 45-minute psychotherapy session. He evaluates medication tolerance and updates the patient’s plan of care.
Here, you should report the psychotherapy code with the GF modifier.
Accurate Usage Guidelines for GF Modifier
The following are the accurate usage guidelines for modifier GF:
Understand When You Should Append It
Listed below are the key criteria for using the GF modifier:
- Append it when the services are rendered in an outpatient department or clinic of a CAH that has formally elected the Method II billing option under 42 CFR 413.70(b)(2).
- The non-physician practitioner has formally reassigned their billing rights to the CAH.
- A qualified NP, PA, or CNS delivered the service.
- The professional service is billed on a UB-04 institutional claim form under designated professional revenue codes (096X–098X series).
- Append the GF modifier to indicate Medicare administrative contractors (MACs) to apply the appropriate statutory payment reduction. That is, you will be reimbursed at 85% of the Medicare Physician Fee Schedule (MPFS) rate. This prevents overpayments and audit liabilities.
Know When NOT to Use the GF Modifier
Do not use it if any or all of the following are true:
- You should never use modifier GF on a professional CMS-1500 claim form.
- Avoid using it if the service was rendered in an acute care facility, standard hospital outpatient department, or a CAH that operates under Method I payment rules.
- Do not append GF if the professional service was rendered by a Doctor of Osteopathic Medicine (DO) or Doctor of Medicine (MD).
- It is not applicable for certified registered nurse (CRN) services or certified registered nurse anesthetist (CRNA) services.
- Never use it for services provided under ‘incident-to’ supervision since the GF modifier identifies services personally delivered by the NPP.
- Avoid using it for services rendered by other specialized non-physician types that have their own designated modifiers. For example, nutrition professionals (modifier AE), certified nurse-midwives (modifier SB), and clinical psychologists (modifier AH).
Final Thoughts on the GF modifier
To summarize, the GF modifier indicates that an NPP such as a PA, NP, or CNS rendered the services instead of a physician at a CAH operating under Method II billing.
Hopefully, this comprehensive guide will become your go-to resource for ensuring accurate use of this HCPCS modifier. However, if you still struggle, feel free to outsource medical billing and coding services to NeuraBill.
