Modifiers serve as a vital tool in medical coding, offering supplemental information that is not otherwise conveyed via procedural/service codes. However, these two-digit codes must be used with vigilance. Even a small error in applying a modifier might have a negative financial impact on your practice.
Let’s look at the assistant-at-surgery modifiers, for example. Several modifiers are available, including 80, 81, 82, and AS. Now, how would you determine which modifier to use in what circumstance? In this blog, we will tell you that by discussing modifier AS in detail.
If you want to understand how to apply this modifier correctly, read this guide till the end.
Modifier AS – Description
Modifier AS is a Level II HCPCS modifier used in medical billing to indicate that a non-physician practitioner (NPP), specifically a physician assistant (PA), nurse practitioner (NP), or clinical nurse specialist (CNS), performed a surgical assistant service.
In simple words, if a physician is taking assistance from a non-physician during surgery, the assistant can apply this modifier to claim payment for the services.
In contrast, if claims are submitted with assistant surgeon modifiers (80, 81, or 82), the payer will assume that a physician offered assistance during surgery.
Appropriate Use Cases for Modifier AS
Here are some scenarios that may further clarify the use of the modifier AS.
PA’s Assistance During Total Knee Arthroplasty
A total knee replacement is performed on a patient who has severe osteoarthritis. The orthopedic surgeon needs help during the procedure because of its complexity level. A physician assistant helps with wound closure, instrument management, and holding retractors.
In order to identify himself as a non-physician surgical assistant, the PA in this instance files a claim for assistant-at-surgery services using the relevant surgical CPT code (e.g., 27447) and the modifier AS attached to it.
NP’s Assistance During Abdominal Surgery
A patient arrives with symptoms of peritonitis and an appendix rupture. The surgeon decides to perform an open appendectomy during which significant adhesions and infection are encountered, necessitating extra support for tissue management, suctioning, and retraction. A nurse practitioner helps.
When billing, the NP adds modifier AS to the surgical code to appropriately reflect the assistant-at-surgery services rendered during this emergency situation.
CNS’s Assistance During Trauma Surgery
For the repair of a complicated femur fracture, a patient involved in a car accident needs open reduction and internal fixation (ORIF). A clinical nurse specialist helps with exposure, reduction, and fixation due to the fracture’s severity.
The CNS ensures appropriate reimbursement for the surgical participation by billing modifier AS for assistant-at-surgery services.
Accurate Usage Guidelines for Modifier AS
The following are some crucial guidelines you must follow when submitting your claims with the modifier AS.
Identify the Inaccurate Use of AS
Do not use the modifier AS if the healthcare professional assisting the primary surgeon is a “physician” or a “surgeon”. This modifier is only used to bill services of non-physician practitioners, including PAs, NPs, or CNSs, during surgeries. Note that this modifier is not applicable to other non-physician healthcare practitioners, like:
- RNFA: Registered Nurse First Assistant
- CRNA: Certified Registered Nurse Anesthetist
- CNM: Certified Nurse Midwife
Ensure the Modifier’s Correct Use
Modifier AS is only applied to surgical procedures that are approved by Medicare for requiring an assistant. Furthermore, the assistant at surgery must meet Medicare’s qualifications.
Include the Required Documents
The insurance payers check all attached documents before providing reimbursement for services. If there is any misinformation or an incomplete document, the payer will reject the claim. Hence, it is essential to justify the use of the modifier AS in your paperwork.
Furthermore, the following are some essential details that must be mentioned in your documents.
- Assistant’s name.
- Assistant’s role.
- Specify the parts of the surgery that the assistant performed.
- Justification for requiring an assistant.
- Time spent assisting in the surgery.
Follow Payers’ Unique Policies
Although modifier AS is specifically recognized by Medicare for the reimbursement of non-physician assistants, many commercial payers also accept claims with this modifier. Medicare usually reimburses assistants at 16% of the primary surgeon’s allowable fee. Hence, for payment rates from other commercial payers, you must contact them.
Final Thoughts
We believe we have discussed all the essential details required to file claims with modifier AS. But for your quick review, we will reiterate that this modifier is applied to bill the services of an assistant at surgery. However, these assistants must be non-physician practitioners (NPPs), preferably physician assistants, nurse practitioners, or clinical nurse specialists.
Despite reading the accurate and inaccurate usage guidelines for this modifier, if you are still reluctant to apply it to your surgical claims, we suggest that you hire professional medical billing and coding services from NeuraBill. Their expert team will guide you, helping you file clean claims and reducing denials.
