Modifiers are an essential part of coding for otolaryngology–head and neck surgeons. While the proper use and implementation of modifiers can feel overwhelming, in practice, they serve a straightforward purpose: modifiers provide additional information about a procedure or service that was performed without changing the definition of the CPT code itself.
The following Q&A provides an overview of modifiers, identifies the modifiers most commonly used in otolaryngology-head and neck surgery, and outlines when and how these modifiers should be appended. Questions about billing and coding using modifiers? Contact the Academy’s Health Policy team: [email protected].
What is a modifier, and why is it necessary? A modifier is a two-character code (numeric, alphanumeric, or occasionally two letters) appended to a CPT, HCPCS, or sometimes an ICD-10-CM code. It clarifies a specific circumstance surrounding a service, such as whether it was performed bilaterally, was distinct from another procedure, or occurred during a post-operative period. Modifiers do not change the core procedure or change the definition of the base code. Instead, they help payers understand the context of the service so that it can be processed correctly. In otolaryngology-head and neck surgery, modifiers are frequently required because office visits often result in in-office procedures, and multiple procedures may occur during the same encounter.
What are the different types of modifiers? There are two primary categories of modifiers:
- CPT Modifiers are two-digit, numerical codes (e.g., modifiers 25, 59, or 22) attached to CPT procedure codes and maintained by the American Medical Association (AMA).
- HCPCS Modifiers are two-digit, typically alphanumeric codes (e.g., RT, LT, GA) maintained by CMS. These modifiers are often applied to describe anatomical sites or special circumstances. For example, 31231-RT would imply a diagnostic nasal endoscopy on the right side of the nose.
What are the most common modifiers for otolaryngologist-head and neck surgeons? Although there are more than 100 modifiers across both categories, a relatively small group accounts for most billing scenarios in otolaryngology-head and neck surgery. The most commonly billed modifiers are listed below. For additional information on specific modifiers, click the links below to access the Academy’s modifier-specific CPT for ENT articles.
- Modifier 25 (Significant, Separately Identifiable E/M Service) is appended to an Evaluation and Management (E/M) code when a significant, separately identifiable E/M service is performed on the same day as a procedure.
- Modifier 59 (Distinct Procedural Service) indicates that two procedures performed on the same day were distinct and should not be bundled together.
- Modifier 50 (Bilateral Procedure) indicates that a procedure was performed bilaterally (i.e., on identical anatomical sides) during the same surgical session.
- Modifiers RT and LT indicate right and left anatomical sides and are used to define “laterality,” or the side of the body on which the procedure or service was applied.
- Global Surgical Modifiers (e.g., modifiers 24, 58, 78, 79): Many surgical procedures include a global period, typically 0, 10, or 90 days. During this period, certain related services are considered part of the original procedure and are not separately payable. However, several modifiers allow practices to report services appropriately when they fall outside of the bundled global services. Below are some common global surgical modifiers used in otolaryngology billing:
- Modifier 24 is used when an unrelated E/M service is performed by the same physician during a post-operative period.
- Modifier 58 is used when a staged or planned procedure is performed during the post-operative period.
- Modifier 78 is used when a patient must return to the operating room during the global period for a related but unplanned procedure.
- Modifier 79 is used when an unrelated procedure or service is performed by the same physician during the global period of another procedure or service.
- Modifier 22 (Increase Procedural Services) indicates that a procedure required substantially greater work than typically required.
- Modifier 52 (Reduced Services) indicates that the work required for the service or procedure was partially reduced at the discretion of the physician.
- Modifier 53 (Discontinued Procedure) indicates that the physician elected to discontinue the procedure or service due to extenuating circumstances or threats to patient safety.
Do modifiers guarantee payment? No. Modifiers provide additional context about a procedure or service, but they do not override payer policy or establish medical necessity. Coverage policies for modifiers tend to vary between payers, so be sure to verify your understanding of payers’ policies before submitting or appealing a claim. Both Medicare and private payers may deny services if documentation does not support the reported modifier.
What is the most important principle to remember about modifiers? Documentation must support every modifier used. If the medical record does not clearly demonstrate why the service was separate, distinct, staged, unrelated, or unusually complex, the modifier should not be appended. Modifiers are tools to communicate the clinical circumstances of care accurately. When used thoughtfully and supported by clear documentation, they promote compliant coding and appropriate reimbursement for otolaryngology services.
Published July 2026
