Do you know that modifiers play an integral role in medical billing? How? Some modifiers can trigger automated pricing changes, while others are used to convey critical information.
This guide is dedicated to one such informational modifier, i.e., the AF modifier. It covers everything you need to know about it, from real-world use cases to accurate usage guidelines. So, continue reading!
AF Modifier – Description
It is an informational modifier that indicates that a specialty physician rendered the care service. Besides, it applies only to Medicare and Medicaid claims to track when a specialty physician provided the service.
Note that, according to some sources, the AF modifier is used to explain a specialty physician’s services in a Physician Scarcity Area (PSA) and to receive a possible bonus payment.
Appropriate Use Cases for AF Modifier
Let’s review some of the real-world examples where this modifier applies:
Wound Debridement for Washington State Medicaid Patient
Suppose that a 53-year-old female patient enrolled in the Washington State Medicaid Program, Apple Health, arrives at a critical access hospital with a diabetic ulcer measuring 15 cm2 in her left leg. The wound requires immediate medical attention to stop the infection from spreading to deep tissues.
The wound specialist decides to debride the open wound, and the billing team bills the procedure with CPT code 97597. However, since the service was performed at a critical access hospital and the patient is a Medicaid beneficiary, the payer wants the AF modifier to be appended to the claim line. This is because 97597 is designated as a ‘sometimes therapy’ code subject to outpatient therapy caps. So, appending modifier AF signals that the service was performed by a specialty physician as a medical procedure, exempting the encounter from the state’s physical therapy visit limits.
Outpatient E/M Visit Rendered By a Psychiatrist
Imagine that a 38-year-old male patient, enrolled in the Medicaid expansion program in North Dakota via Blue Cross Blue Shield, visits an outpatient mental health clinic to get consultation and medication for his depression. He is a new patient at the clinic, and the visit with the experienced psychiatrist lasts a little over 30 minutes.
The psychiatrist takes the patient’s medical and family history, performs some standard clinical tests for depression, like the PHQ-9, and low-level medical decision-making before prescribing antidepressants. The evaluation and management (E/M) visit is coded as 99203, and the AF modifier is appended to it to specify a specialty physician (psychiatrist) and meet North Dakota Medicaid’s billing requirements. Moreover, diagnosis code F32.0 is reported on the professional claim form to justify the medical necessity of the E/M service.
Accurate Usage Guidelines for AF Modifier
Discussed below are the essential billing guidelines related to this modifier:
Understand When You Should Use It
Listed below is the key criterion for appending this modifier:
- You should append it when required by specific local Medicare administrative contractors (MACs) or state Medicaid programs to identify that a specialty physician rendered the service.
- What happens when you are billing under Critical Access Hospitals (CAHs) using Method II billing in a designated physician scarcity area (PSA)? You should apply the AF modifier to capture an 115% reimbursement rate and quarterly bonus payments.
- Use it on behavioral health claims where state-specific Medicaid guidelines explicitly mandate using it to distinguish a licensed psychiatrist (MD/DO) from non-physician mental health practitioners.
- Always place it in the final modifier slot since it is an informational modifier and does not affect the base fee schedule rate.
Know When NOT to Append It
Do not use it if any of the following is true:
- A sub-specialist sees the patient after a different specialist in the same group practice.
For example, a patient visits a general orthopedist for a complex wrist injury. The orthopedist refers him to a hand specialist within the same group practice. Now, when billing for the hand specialist encounter, the AF modifier does not apply. - If a physician assistant (PA), nurse practitioner (NP), or clinical social worker rendered the service.
- The patient is not a Medicare/Medicaid beneficiary. That is, avoid appending it to commercial claims unless the payer policy demands it.
Final Thoughts on AF Modifier
To summarize, the AF modifier is a Medicare/Medicaid-specific informational modifier. It is used to inform the payer that a specialty physician provided the service.
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