--- title: "Modifier 26 vs. Modifier 51: What They Mean and When to Use Each | Nym" description: Learn when to use CPT Modifier 26 versus Modifier 51 for medical billing. Explore key differences, examples, exemptions and common coding errors. image: https://blog.nym.health/hubfs/Modifier%2026%20vs.%20Modifier%2051_%20What%20They%20Mean%20and%20When%20to%20Use%20Each.png --- [![Num](https://blog.nym.health/hubfs/NYM_March2019%20Theme/Images/nym-logo%20(1).png)](https://nym.health/) - Autonomous Medical Coding - [Overview](https://nym.health/autonomous-medical-coding/overview/) - [Nym's Engine](https://nym.health/autonomous-medical-coding/nym-engine/) - [The Technology](https://nym.health/autonomous-medical-coding/the-technology/) - [Implementation](https://nym.health/autonomous-medical-coding/implementation/) - [Why Nym](https://nym.health/why-nym/) - Company - [About](https://nym.health/about/) - [Press Releases](https://nym.health/press-release/) - [Careers](https://nym.health/careers/) - Resources - [Autonomous Coding Education Hub](https://nym.health/education-hub/) - [Content Library](https://nym.health/resources/) - [Contact](https://nym.health/contact-us/) - [Request a Demo](https://nym.health/request-a-demo/) ### Request a Demo Blog # Modifier 26 vs. Modifier 51: What They Mean and When to Use Each By Kacie Geretz, Director of Growth Enablement October 22, 2026 • 7 min read ![Two folders stacked on a desk, with a stethoscope setting next to them](https://blog.nym.health/hs-fs/hubfs/Modifier%2026%20vs.%20Modifier%2051_%20What%20They%20Mean%20and%20When%20to%20Use%20Each.png?width=1200&height=500&name=Modifier%2026%20vs.%20Modifier%2051_%20What%20They%20Mean%20and%20When%20to%20Use%20Each.png) ### Article Highlights - Modifier 26 identifies the professional component of an eligible diagnostic service. Modifier 51 identifies additional procedures performed in the same session. Payment reductions depend on the procedures and payer rules. - Common errors include using modifier 26 when global billing is appropriate or appending modifier 51 to add-on, exempt, or bundled codes. - Payer requirements differ. Checking code eligibility, documentation, and payer policy helps teams prevent modifier-related claim edits and rework. On this page - - - [mailto:https://blog.nym.health/modifier-26-vs-modifier-51](mailto:https://blog.nym.health/modifier-26-vs-modifier-51) Modifier 26 and modifier 51 both affect how services are reported for payment, but they serve different purposes. Using the wrong modifier, or placing it on the wrong claim line, can trigger a claim edit or incorrect payment. Modifier 26 identifies the professional component of a service that supports separate professional and technical reporting. Modifier 51 identifies additional procedures performed by the same physician or qualified health care professional on the same patient during the same session. ## **What Is Modifier 26?** Modifier 26 is a Current Procedural Terminology (CPT) modifier that identifies the professional component of an eligible diagnostic service, such as a physician's interpretation and written report. The technical component covers the staff, equipment, and supplies needed to perform the test or scan. (1, 2) You append modifier 26 when reporting only the professional component of a code that supports separate professional and technical billing. Not every diagnostic code accepts modifier 26. Some codes already describe only the professional component and should be reported without it. Check the code's professional/technical-component designation before appending the modifier. (4) The entity furnishing the technical component reports its services under the applicable billing rules. Modifier TC, a Healthcare Common Procedure Coding System (HCPCS) modifier, identifies the technical component where appropriate; hospital facility billing follows different rules. (1, 2) ## **What Is Modifier 51?** Modifier 51 identifies additional procedures performed by the same physician or qualified health care professional on the same patient in the same session. It excludes evaluation and management (E/M) services, physical medicine and rehabilitation services, and supplies such as vaccines. (3) When the payer requires modifier 51, append it to eligible additional procedures, not the primary procedure. Those procedures may be subject to a multiple-procedure payment reduction. The applicable reduction depends on the codes and payer policy, rather than the presence of the modifier alone. (3, 4) ## **Modifier 26 vs. Modifier 51: Key Differences** | | **Modifier 26** | **Modifier 51** | | --- | --- | --- | | What it describes | The professional component of an eligible service | Additional procedures in the same session | | Effect on payment | Identifies billing for the professional portion only | Additional procedures may be subject to payer-specific payment reductions | | Place of service | Generally reflects where the patient received the technical component | Reporting depends on payer and claim type | | Who appends it | The provider reporting the professional component | The provider when required by the payer; Medicare generally applies multiple-procedure payment rules automatically | Modifier 26 is not limited to hospital settings. Under Medicare's general policy, the place-of-service code for a diagnostic service's professional component reflects where the patient received the technical component, even if the physician interpreted the results elsewhere. Check applicable payer requirements and any exceptions before submitting the claim. (2) For Medicare, providers generally do not need to append modifier 51 because the claims system applies multiple-procedure payment rules automatically. Commercial payer requirements vary. (3, 7) ## **When to Use Modifier 26** Use modifier 26 when reporting only the professional component of an eligible service. If the same physician or practice furnishes both components, report the service globally without modifier 26 or TC when global billing requirements are met. The decision depends on the components furnished and billed, not equipment ownership alone. (1, 2) Examples, when the selected code supports separate professional and technical reporting, include: - A radiologist interpreting a scan performed at a hospital - A cardiologist interpreting an echocardiogram recorded by hospital technicians - A pathologist interpreting a specimen processed at an outside lab ## **When to Use Modifier 51** Use modifier 51 when required by the payer for additional, separately reportable procedures performed on the same patient during the same session by the same physician or qualified health care professional. Do not append it to add-on codes, modifier 51-exempt codes, or services bundled into another reported procedure. (3) Consider a surgeon who excises a malignant skin lesion and closes the wound with a layered, intermediate repair. The excision code includes simple closure, but an intermediate repair may be reported separately when supported by the documentation and applicable coding rules. (5) Rank the separately reportable procedures using the payer's payment rules, and append modifier 51 to the eligible additional procedure when required. (3, 4) ## **Modifier 51-Exempt Codes** Some codes do not take modifier 51, even when performed alongside another procedure: - **Add-on codes:** These describe work performed in addition to a primary procedure and cannot be billed on their own. CPT lists them in Appendix D, and their value already reflects that they are supplementary. (3) - **Modifier 51-exempt codes:** CPT identifies these with a slashed-circle symbol and lists them in Appendix E. They can be reported independently when appropriate but do not take modifier 51. (3) Check exemption status in the current CPT code set or your coding software before submitting the claim. ## **Common Modifier 26 and 51 Errors and How to Prevent Them** Watch for these errors: - Appending modifier 26 to a code that does not accept it or already represents only the professional component (4) - Using modifier 26 when the practice should report the service globally (1, 2) - Reporting a place of service that does not follow the applicable rules for the technical component's location (2) - Appending modifier 51 to an add-on, exempt, or bundled code (3) - Appending modifier 51 to the primary procedure instead of eligible additional procedures (3) Start with code eligibility and payer policy. Confirm which components were furnished and billed, whether the interpretation has a supporting report, and whether each procedure is separately reportable. Rank procedures according to the payer's payment rules, and append modifiers where required. Include modifier usage in QA sampling to identify recurring errors before they lead to more claim rework. Maintaining consistent coding requires clear rules and a way to review how they were applied. Nym's autonomous medical coding engine uses [Clinical Language Understanding](https://nym.health/autonomous-medical-coding/the-technology/) (CLU) to translate clinical documentation into codes within the scope of each deployment. Its engine is configurable to industry and customer-specific coding guidelines, and each coding decision comes with a transparent audit trail. At one large health system, the radiology professional fee coding-related denial rate fell 97% after moving to [Nym's autonomous medical coding engine.](https://nym.health/autonomous-medical-coding/nym-engine/) [Request a demo](https://nym.health/request-a-demo/) to see Nym's autonomous medical coding engine and audit trails in action. ## **Sources** 1. Chaplain, S. (October 14, 2020).[When to Apply Modifiers 26 and TC](https://www.aapc.com/blog/52001-when-to-apply-modifiers-26-and-tc/). AAPC. 2. Centers for Medicare & Medicaid Services.[Medicare Claims Processing Manual, Chapter 13: Radiology Services and Other Diagnostic Procedures](https://www.cms.gov/Regulations-and-Guidance/Guidance/Manuals/Downloads/clm104c13.pdf). Sections 20 and 150. 3. Noridian Healthcare Solutions.[Modifier 51](https://med.noridianmedicare.com/web/jfb/topics/modifiers/51). Medicare JF Part B. 4. Noridian Healthcare Solutions.[MPFS Indicator Descriptors](https://med.noridianmedicare.com/web/jfb/fees-news/fee-schedules/mpfs/mpfs-indicator-descriptors). Professional/Technical Component Rules and Multiple Surgery Rules. 5. AAPC. (August 13, 2015).[Melanoma: Including Repair in All Melanoma Codes? Read This First](https://www.aapc.com/codes/coding-newsletters/my-dermatology-coding-alert/melanoma-including-repair-in-all-melanoma-codes-read-this-first-147247-article). Dermatology Coding Alert. 6. Centers for Medicare & Medicaid Services. (April 2026).[Proper Use of Modifiers 59, XE, XP, XS & XU](https://www.cms.gov/files/document/mln1783722-proper-use-modifiers-59-xe-xp-xs-xu.pdf). Medicare Learning Network, MLN1783722. 7. Noridian Healthcare Solutions.[Modifier 51](https://med.noridianmedicare.com/web/jfa/topics/modifiers/51). Medicare JF Part A. ## Frequently Asked Questions ### What is the difference between modifier 26 and modifier TC? Modifier 26 identifies the professional component of an eligible service, such as the physician's interpretation and report. Modifier TC identifies the technical component, including equipment, staff, and supplies. When one physician or practice furnishes both components and meets global billing requirements, the global service is reported without either modifier. (1, 2) ### When should modifier 51 not be used? Do not append modifier 51 to add-on codes, modifier 51-exempt codes, services bundled into another procedure, or the primary procedure in a session. It also does not apply to E/M services, physical medicine and rehabilitation services, or supplies. Medicare generally does not require providers to append it because payment rules are applied automatically. (3, 7) ### What is the difference between modifier 51 and modifier 59? Modifier 51 identifies additional procedures in the same session; it does not override National Correct Coding Initiative (NCCI) bundling edits. Modifier 59 identifies a distinct procedural service when documentation supports separate reporting and the applicable edit permits a modifier exception. Different procedure names alone are not sufficient. Use a more specific modifier, including XE, XP, XS, or XU, when appropriate. (3, 6) ### Can modifier 26 and modifier 51 be used on the same claim? Yes, when each modifier's requirements are met. Modifier 26 identifies the professional component of an eligible service, while modifier 51 identifies an eligible additional procedure. Check the codes and payer policy to determine which modifiers belong on each claim line. (3, 4) ### How does modifier 51 affect reimbursement? Additional procedures may receive reduced payment under the payer's multiple-procedure payment policy. The highest-valued procedure is generally paid without that reduction, while eligible additional procedures are paid at reduced rates. The calculation depends on the services and payer policy; Medicare can apply reductions without modifier 51 on the submitted claim. (4, 7) [#Medical coding](https://blog.nym.health/tag/medical-coding) [#Autonomous Coding](https://blog.nym.health/tag/autonomous-coding) [#Compliance](https://blog.nym.health/tag/compliance) [#Modifiers](https://blog.nym.health/tag/modifiers) ![Photo of Kacie Geretz, Director of Growth Enablement](https://blog.nym.health/hs-fs/hubfs/Screenshot%202025-05-07%20at%201.16.20%20PM.png?width=80&height=80&name=Screenshot%202025-05-07%20at%201.16.20%20PM.png) #### Kacie Geretz, Director of Growth Enablement Kacie Geretz, RHIA, CPMA, CPC, CCA is the Director of Growth Enablement at Nym, where she aligns Nym’s product roadmap with the evolving needs of health system partners and serves as the externally-facing expert on Nym’s autonomous medical coding engine. A graduate of The Ohio State University’s Health Information Management program, Kacie brings deep expertise across the revenue cycle—having led revenue integrity programs, built managed care contracting and credentialing infrastructure, and driven denials and A/R process improvement initiatives. She is passionate about advancing healthcare automation and regularly shares insights on coding innovation and RCM transformation. ### Questions? Get in Touch with Nym's Team [![nym health](https://blog.nym.health/hubfs/NYM_March2019%20Theme/Images/nym-logo.png)](https://nym.health/) ## Autonomous Medical Coding - [Overview](https://nym.health/autonomous-medical-coding/overview/) - [Nym's Engine](https://nym.health/autonomous-medical-coding/nym-engine/) - [The Technology](https://nym.health/autonomous-medical-coding/the-technology/) - [Implementation](https://nym.health/autonomous-medical-coding/implementation/) ## Company - [Why Nym](https://nym.health/why-nym/) - [Autonomous Coding Education Hub](https://nym.health/education-hub/) - [Content Library](https://nym.health/resources/) - [About](https://nym.health/about/) - [Press Releases](https://nym.health/press-release/) - [Careers](https://nym.health/careers/) - [Contact](https://nym.health/contact-us/) ## Visit Us [Linkedin](https://www.linkedin.com/company/nym/) Facebook ### © NYM All rights reserved - [Terms & Conditions](https://nym.health/terms-conditions/) - [Privacy Policy](https://nym.health/privacy-policy/) - [Cookie Policy](https://nym.health/cookie-policy/) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Kacie Geretz, Director of Growth Enablement", "url" : "https://blog.nym.health/author/kacie-geretz-rcm-solutions-manager" }, "dateModified" : "2026-10-22T15:31:09.991Z", "datePublished" : "2026-10-22T15:31:09.000Z", "headline" : "Modifier 26 vs. Modifier 51: What They Mean and When to Use Each | Nym", "image" : [ "https://blog.nym.health/hubfs/Modifier%2026%20vs.%20Modifier%2051_%20What%20They%20Mean%20and%20When%20to%20Use%20Each.png" ], "mainEntityOfPage" : { "@id" : "https://blog.nym.health/modifier-26-vs-modifier-51", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://blog.nym.health/hubfs/nym-logo.png" }, "name" : "Nym" } } ``` ```json { "@context" : "https://schema.org", "@type" : "FAQPage", "mainEntity" : [ { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Modifier 26 identifies the professional component of an eligible service, such as the physician's interpretation and report. Modifier TC identifies the technical component, including equipment, staff, and supplies. When one physician or practice furnishes both components and meets global billing requirements, the global service is reported without either modifier. (1, 2)" }, "name" : "What is the difference between modifier 26 and modifier TC?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Do not append modifier 51 to add-on codes, modifier 51-exempt codes, services bundled into another procedure, or the primary procedure in a session. It also does not apply to E/M services, physical medicine and rehabilitation services, or supplies. Medicare generally does not require providers to append it because payment rules are applied automatically. (3, 7)" }, "name" : "When should modifier 51 not be used?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Modifier 51 identifies additional procedures in the same session; it does not override National Correct Coding Initiative (NCCI) bundling edits. Modifier 59 identifies a distinct procedural service when documentation supports separate reporting and the applicable edit permits a modifier exception. Different procedure names alone are not sufficient. Use a more specific modifier, including XE, XP, XS, or XU, when appropriate. (3, 6)" }, "name" : "What is the difference between modifier 51 and modifier 59?" }, { "@type" : "Question", "acceptedAnswer" : { "@type" : "Answer", "text" : "Yes, when each modifier's requirements are met. Modifier 26 identifies the professional component of an eligible service, while modifier 51 identifies an eligible additional procedure. Check the codes and payer policy to determine which modifiers belong on each claim line. 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