CPT Codes for Radial Head Fracture Management

A fall onto an outstretched hand (FOOSH) is a seemingly simple mechanism of injury, a common occurrence in icy winters, on playgrounds, or during athletic competition. Yet, the force transmitted up the arm can unleash a complex cascade of damage, often culminating in a fracture of the radial head—the keystone of the elbow joint. For the orthopedic surgeon, the challenge lies in accurately diagnosing the fracture pattern, assessing associated soft-tissue injuries, and selecting the optimal treatment strategy to restore pain-free function. For the medical coder, biller, and practice administrator, the challenge is translating this intricate clinical decision-making into the precise, alphanumeric language of Current Procedural Terminology (CPT®) codes.

Coding for a radial head fracture is far from a simple, one-code-fits-all endeavor. It is a nuanced process that demands a deep understanding of orthopedic anatomy, surgical techniques, and the intricate rules governing procedural coding. A miscoded claim can lead to significant financial loss for a practice, delayed payments, and even allegations of fraud. This article serves as an exhaustive guide, delving beyond the basic code descriptions to explore the clinical rationale, coding intricacies, and documentation requirements essential for accurate and compliant reimbursement for the management of radial head fractures. Our journey will navigate from the anatomy lab to the operating room, and finally, to the billing office, ensuring you possess the knowledge to confidently handle these complex cases.

2. Anatomy 101: The Critical Role of the Radial Head

To correctly code for an injury, one must first understand the anatomy of what is injured. The radial head is not merely a bony knob at the proximal end of the radius; it is a critical biomechanical component of the elbow and forearm.

• Location and Structure: The radial head is a disc-shaped bone that forms the proximal end of the radius. It articulates with two key structures:

  1. The Capitellum: The rounded, knuckle-like end of the humerus. This radio-capitellar joint is a primary hinge for elbow flexion and extension.

  2. The Radial Notch of the Ulna: A small arc on the proximal ulna where the radial head sits, forming the proximal radio-ulnar joint (PRUJ). This joint is essential for the motions of pronation and supination (rotating the palm up and down).

• Function: The radial head is a crucial stabilizer of the elbow. It acts as a secondary stabilizer against valgus stress (force bending the elbow outward), with the primary stabilizer being the ulnar collateral ligament. Perhaps more importantly, it is a primary stabilizer against longitudinal forces—it resists the proximal migration of the radius under axial load, maintaining the normal relationship between the radius and ulna. This function is critical for load-sharing and the smooth rotation of the forearm.

• Implications for Injury: When the radial head is fractured, these stabilizing functions are compromised. The severity of the fracture dictates the degree of instability. A non-displaced crack may preserve stability, while a comminuted (shattered) fracture can lead to profound elbow instability, wrist pain (from proximal radial migration), and long-term arthritis if not managed appropriately. This anatomical understanding is the foundation upon which treatment options—and thus, coding choices—are built.

3. The Spectrum of Radial Head Fractures: Mason Classification and Beyond

Not all radial head fractures are created equal. The Mason classification system (later modified by Johnston) is the most commonly used framework for describing these fractures and guiding treatment. A coder must be familiar with these types, as they directly correlate to the procedures performed.

• Type I: A non-displaced or minimally displaced (<2mm) fracture of the margin or head of the radius. The elbow joint is stable. Treatment: Almost always non-operative (sling, early motion). CPT Correlation: Evaluation and Management (E/M) codes, casting/strapping codes, and possibly CPT 24655 for closed treatment with manipulation.

• Type II: A displaced (>2-3mm) marginal fracture involving a segment of the radial head. The fracture may block motion (typically forearm rotation) or create a mechanical block. The elbow may be stable or unstable. Treatment: Often requires surgical intervention, either Open Reduction and Internal Fixation (ORIF) or excision. CPT Correlation: CPT 24665 for ORIF or CPT 24155 for excision.

• Type III: A comminuted (shattered) fracture of the entire radial head. The elbow is almost always unstable due to the loss of the bony stabilizer. Treatment: Not amenable to fixation. Requires either excision or, more commonly in modern practice, radial head arthroplasty (replacement). CPT Correlation: CPT 24155 for excision or CPT 24365/24366 for arthroplasty.

• Type IV (Johnston Modification): Any radial head fracture (I, II, or III) associated with an elbow dislocation. This signifies a high-energy injury with a high likelihood of severe associated soft-tissue and ligamentous damage. Treatment: Requires addressing the fracture AND the dislocation and any associated ligamentous injuries. CPT Correlation: This is where coding becomes complex, often requiring multiple codes for the fracture procedure, ligament repair, and potentially coronoid fixation.

Understanding this classification allows the coder to anticipate the likely procedures from the surgeon’s operative report and verify that the documented procedure aligns with the injury pattern.

4. The Diagnostic Pathway: From History to Imaging

Before any treatment is rendered, a diagnosis must be established. The codes for these diagnostic steps are separate from the procedural codes for treatment.

• History and Physical Exam (H&P): The provider will ascertain the mechanism of injury and assess pain, swelling, and loss of motion. A key clinical test is the “lateral pivot shift test” or assessing for “valgus instability.” Coding: Use the appropriate E/M code (99202-99215 for office visits, 99221-99233 for inpatient) based on the level of history, exam, and medical decision-making.

• Imaging:

  • Radiographs (X-rays): The initial imaging study. Anteroposterior (AP) and lateral views of the elbow are standard. A specialized “radiocapitellar view” (Greenspan view) can help visualize the radial head without ulnar overlap. Coding: CPT 73070 (Radiologic exam, elbow; 2 views) or 73080 (Radiologic exam, elbow; complete, minimum of 3 views).

  • Computed Tomography (CT) Scan: Crucial for pre-operative planning. A CT scan with 3D reconstructions provides exquisite detail of the fracture pattern, degree of comminution, and displacement, which is vital for deciding between ORIF and arthroplasty. It also excellently visualizes associated coronoid process fractures. Coding: CPT 73200 (CT upper extremity; without contrast) or 73201 (CT upper extremity; with contrast).

  • Magnetic Resonance Imaging (MRI): Not routinely used for the bony injury itself but is the gold standard for evaluating associated ligamentous tears (e.g., medial ulnar collateral ligament – MUCL, lateral ulnar collateral ligament – LUCL) and cartilaginous injuries. Coding: CPT 73221 (MRI upper extremity, joint; without contrast) or 73222 (with contrast).

Accurate diagnosis sets the stage for the treatment plan, and each diagnostic step has its own associated CPT code for billing.

5. Non-Operative Management: When and How (CPT 24655)

Indication: Stable, non-displaced, or minimally displaced fractures (Mason Type I) without a mechanical block to motion.

Procedure: The elbow may be immobilized in a splint or sling for a brief period (often 5-7 days) for pain control, followed by early, progressive range-of-motion exercises to prevent stiffness. Sometimes, if there is a slight displacement, a closed manipulation under anesthesia may be performed to improve alignment before splinting.

CPT Code: 24655 – Closed treatment of radial head or neck fracture; with manipulation.

• Coding Notes:

  • This code includes the application of the initial splint or cast.

  • If no manipulation is performed—meaning the fracture is simply immobilized—this service is included in the E/M service and the casting/splinting application code (29075 for application of long arm cast).

  • The global period for this code is 10 days. All related follow-up care within those 10 days is bundled into the procedural payment.

6. Surgical Intervention: Navigating the Options

When non-operative management fails or is inappropriate due to fracture characteristics, surgery is indicated. The choice of procedure is the single most important factor determining the CPT code.

Open Treatment of Radial Head Fractures (CPT 24665)

Indication: Displaced, reconstructable fractures (Mason Type II) where the fragments are large enough to hold screws.

Procedure: The surgeon makes an incision (often a lateral approach like Kocher or Kaplan), reduces the fracture fragments into their anatomic position, and fixes them with implants. This typically involves small screws (1.5mm to 3.0mm), often headless compression screws, and/or a mini-fragment plate.

CPT Code: 24665 – Open treatment of radial head or neck fracture, includes internal fixation or radial head excision, when performed.

• Coding Notes:

  • This is the workhorse code for ORIF of the radial head.

  • The phrase “includes radial head excision, when performed” is critical. It means if during the procedure for a Type II fracture, a small, un-fixable fragment is excised, you cannot separately code for that excision (CPT 24155). It is considered integral to the ORIF procedure. You only report 24665.

  • The global period is 90 days.

Radial Head Excision (CPT 24155)

Indication: Historically used for comminuted fractures (Mason Type III) in low-demand patients. Its use has declined due to the risk of long-term complications like proximal radial migration, wrist pain, and valgus instability. It is now more commonly used for painful nonunions or malunions after previous fractures.

Procedure: The radial head is surgically exposed and removed in its entirety.

CPT Code: 24155 – Excision of radial head.

• Coding Notes:

  • This is a straightforward code. However, if the excision is performed as part of a more complex procedure (e.g., for a terrible triad injury where the primary procedure is a ligament repair), its necessity and separate coding must be carefully evaluated against NCCI edits.

  • Global period is 90 days.

Radial Head Arthroplasty (CPT 24365, 24366)

Indication: The modern standard of care for unreconstructable, comminuted radial head fractures (Mason Type III), especially in the setting of elbow instability (e.g., with ligament tears or dislocation).

Procedure: The fractured radial head fragments are excised. The radial neck is prepared, and a metal prosthetic implant is inserted. Implants can be monopolar (a single piece) or bipolar (a head that articulates with a stem).

CPT Codes:

• 24365 – Arthroplasty, radial head;

• 24366 – Arthroplasty, radial head; with implant

• Coding Notes:

  • This is a rare and confusing code pair in CPT. 24365 is intended for a very specific, historical “biologic” arthroplasty (e.g., using fascia or other tissue to create a new head), which is almost never performed today.

  • 24366 is the code for a prosthetic radial head replacement, which is the modern procedure. You must use 24366 for virtually all radial head replacement surgeries.

  • The code includes the excision of the fractured radial head. Do not report 24155 separately.

  • Global period is 90 days.

7. The Nuances of Coding: Bundling, Modifiers, and Global Periods

This is where expert coding knowledge is paramount. Procedures are not performed in a vacuum, and payers have strict rules about what can be billed together.

• National Correct Coding Initiative (NCCI) Edits: The CMS-developed NCCI edits define pairs of codes that should not be billed together because one service is integral to the other. For example:

  • 24665 (ORIF) vs. 24155 (Excision): NCCI bundles excision into ORIF. If both are performed, only 24665 is reported.

  • 24366 (Arthroplasty) vs. 24155 (Excision): NCCI bundles excision into arthroplasty. Only 24366 is reported.

  • Ligament Repair vs. Fracture Procedure: Repair of collateral ligaments (e.g., 24301) performed through the same incision as the radial head procedure is often bundled. If a separate, distinct incision is required and the ligament repair is a significant, separately identifiable procedure, it may be billed with a modifier.

• Modifiers: Modifiers indicate that a service or procedure has been altered by specific circumstances.

  • Modifier -59 (Distinct Procedural Service): Used to indicate that a procedure was distinct and independent from other services performed on the same day. This is often needed to bypass an NCCI edit. For instance, if a medial collateral ligament repair (24301) is performed through a separate medial incision for a terrible triad injury, you would report:

    • 24665 (or 24366) -LT (for the radial head)

    • 24301 -LT -59 (for the ligament repair, indicating a distinct procedure)

  • Modifier -51 (Multiple Procedures): Indicates that multiple procedures were performed during the same session. The primary procedure is paid at 100%, and subsequent procedures are paid at a reduced rate (often 50%). Most modern payer software applies this reduction automatically.

• Global Surgical Package: The fracture treatment codes (24655, 24665, 24155, 24366) have a 90-day global period (10-day for 24655). This means the payment for the surgery includes all related postoperative care (e.g., dressing changes, suture removal, follow-up visits) for that period. You cannot bill separate E/M codes for related care during the global period unless specific, strict criteria are met (e.g., unrelated problem).

8. Documentation is King: What Surgeons Must Dictate

The operative report is the source of truth for coders. Incomplete documentation leads to down-coding or denials. Surgeons must clearly document:

1. Preoperative Diagnosis: e.g., “Comminuted, displaced radial head fracture with elbow dislocation (Terrible Triad injury).”

2. Postoperative Diagnosis: (Should be the same or more refined).

3. Procedure(s) Performed: A clear, concise title.

4. Indications: Why the surgery was necessary.

5. Detailed Description:

   • Incision(s): Note the specific approach (e.g., “lateral Kocher approach”) and, critically, if a separate incision was made for another procedure (e.g., “a separate medial approach was made over the medial epicondyle”).

   • Findings: Describe the fracture, soft tissue damage, ligament integrity (e.g., “LUCL was avulsed from the lateral epicondyle”).

   • Specific Steps: For ORIF: “The fracture was reduced and fixed with two 2.0mm headless compression screws.” For Arthroplasty: “The comminuted fragments were excised. The neck was trimmed with a saw. The canal was prepared, and a trial implant was inserted. The appropriate-sized monopolar implant was impacted into place.”

   • Associated Procedures: “The LUCL avulsion was repaired with a suture anchor through the same lateral incision.” OR “Through a separate medial incision, the MUCL was identified and repaired with a suture anchor.”

   • Stability Assessment: “The elbow was taken through a range of motion and was found to be stable through an arc of 30-130 degrees of flexion and full pronation and supination.”

6. Implants Used: Document the manufacturer and size of any prosthesis or hardware.

9. A Deep Dive into Associated Procedures and Coding

Radial head fractures, especially high-energy ones, rarely occur in isolation.

• Ligament Repair (CPT 24301 – Repair of collateral ligament, elbow, with local or fascial tissue (includes graft harvest)): This code is used for repairing the Medial UCL or Lateral LUCL. As discussed, if performed through a separate incision, it may be billed with modifier -59. If performed through the same incision, it is typically bundled.

• Coronoid Fracture Fixation (CPT 24675 – Open treatment of ulnar fracture, proximal end, includes olecranon and coronoid process(es)): A coronoid fracture is a key component of the “terrible triad” injury. Fixation is often necessary for stability. This is a separately reportable code if performed. CPT 24685 is for treatment of a Monteggia-type fracture, which is a different injury pattern.

• Arthroscopy (CPT 29834 – Arthroscopy, elbow, diagnostic; 29835 – with removal of loose body; 29836 – with debridement): Elbow arthroscopy is increasingly used as an adjunct to open procedures. It allows for assessment of reduction, evaluation of cartilage, and removal of small osteochondral fragments. If a diagnostic arthroscopy is performed and is the only procedure, code 29834. If loose bodies are removed, code 29835. If a more extensive synovectomy or chondroplasty is performed, code 29836. Crucially, if an arthroscopy is performed and then the surgeon converts to an open procedure, the arthroscopy is bundled into the open procedure and cannot be billed separately.

10. The Financial Landscape: RVUs and Reimbursement Considerations

The value of a procedure in the Medicare system is determined by its Relative Value Units (RVUs). These are multiplied by a conversion factor to determine the payment. Understanding RVUs helps practices understand the relative financial weight of different procedures.

 RVU and Reimbursement Comparison for Common Radial Head Procedures (National Average, Facility)

**Estimate based on 2024 National CF of $33.2875. Actual reimbursement varies by locality.*

This table illustrates why accurate coding is financially critical. Reporting a simple excision (24155) when a complex arthroplasty (24366) was performed would result in a significant underpayment. Conversely, incorrectly reporting 24366 for an ORIF could be considered fraud.

11. Avoiding Common Pitfalls and Audit Triggers

• Mismatched Diagnosis and Procedure: Ensure the ICD-10-CM diagnosis code supports the CPT procedure code. A Mason Type I fracture (S52.111-) does not support medical necessity for an arthroplasty (24366).

• Unbundling: Illegally reporting bundled codes together (e.g., 24665 and 24155) is a major audit target.

• Lack of Medical Necessity: The documentation must clearly justify why the chosen procedure was necessary. For example, why was an arthroplasty chosen over an excision? The op note should state: “Due to comminution and associated ligamentous instability, the decision was made to proceed with arthroplasty to provide a stable fulcrum.”

• Incorrect Use of Modifier -59: Overuse or incorrect use of -59 is a huge red flag for auditors. The documentation must clearly support a “distinct procedural service.”

• Coding for Bundled Arthroscopy: Reporting 29835 for a loose body removed during an open procedure.

12. Case Studies: Applying Knowledge to Real-World Scenarios

Case 1: The Isolated Mason Type II Fracture

• Presentation: A 35-year-old male fell off a bike. X-ray shows a displaced 3-part radial head fracture without dislocation. CT confirms fragments are fixable.

• Procedure: ORIF via lateral approach using two headless compression screws.

• Coding: 24665 (Open treatment). No other codes are warranted.

Case 2: The Terrible Triad Injury

• Presentation: A 45-year-old female fell from a height. X-ray shows elbow dislocation, comminuted radial head fracture, and coronoid tip fracture. Reduced in ER but unstable.

• Procedure:

  1. Lateral approach: Radial head was comminuted and not reconstructable. It was excised, and a radial head arthroplasty was performed (24366).

  2. Through the same lateral incision, the avulsed LUCL was repaired with a suture anchor (bundled into 24366).

  3. A separate medial incision was made. The coronoid fracture was identified and fixed with a single suture lasso technique (24675).

• Coding:

  • 24366 -LT (Arthroplasty)

  • 24675 -LT -59 (Coronoid ORIF, distinct incision and procedure)

  • Note: LUCL repair is not separately coded.

Case 3: The Delayed Nonunion

• Presentation: A 50-year-old male with a past Mason Type II fracture treated elsewhere with ORIF presents with pain and nonunion. X-ray shows broken hardware and nonunion.

• Procedure: Removal of old hardware, excision of nonunited radial head.

• Coding:

  • 20680 -LT (Removal of deep hardware)

  • 24155 -LT -51 (Excision of radial head)

13. Conclusion: Synthesizing the Art and Science of Fracture Coding

Accurate coding for radial head fractures is a multidisciplinary endeavor rooted in clinical understanding. The journey from a patient’s fall to a paid claim requires seamless integration of orthopedic knowledge and precise coding expertise. Mastering the Mason classification, the specific CPT codes, and the complex rules of bundling and modifiers is essential for ensuring compliance and securing appropriate reimbursement for the valuable care provided by orthopedic surgeons.

14. Frequently Asked Questions (FAQs)

Q1: Can I bill for an elbow arthroscopy (29835) if it was used to assist in the reduction or to remove a loose body during an open ORIF (24665)?
A: No. According to NCCI edits and CPT guidelines, an arthroscopic procedure is considered integral to the open surgical procedure when performed on the same anatomy and is not separately reportable.

Q2: What is the correct ICD-10-CM code for a radial head fracture?
A: The code is from category S52.1- (Fracture of radial head). A 5th or 6th digit is required to specify laterality (left, right) and encounter (initial, subsequent, sequelae). A 7th character defines the type (e.g., A-displaced, B-nondisplaced, C-open). For example, a displaced initial fracture of the right radial head is S52.111A.

Q3: How do I code for a radial neck fracture versus a radial head fracture?
A: In the CPT system, they are grouped together. The same codes (24655, 24665) are used for fractures of the radial head or neck. The ICD-10-CM code would differ slightly: a radial neck fracture is S52.13-.

Q4: If a surgeon performs a radial head arthroplasty (24366) and also repairs the medial collateral ligament through a separate incision, can I bill both?
A: Yes, this is a common scenario. You would report 24366 for the arthroplasty and 24301 for the ligament repair. You must append modifier -59 to 24301 to indicate it was performed through a separate, distinct incision. The operative report must clearly document the separate medial incision.

Q5: What is the difference between CPT 24365 and 24366?
A: As noted in the article, 24365 is for a non-implant arthroplasty (e.g., using a fascial graft), which is a historical and exceedingly rare procedure. 24366 is for arthroplasty with an implant (prosthesis) and is the correct code for virtually all modern radial head replacement surgeries.

15. Additional Resources

• American Medical Association (AMA): For the definitive CPT® code set and official guidelines. https://www.ama-assn.org

• Centers for Medicare & Medicaid Services (CMS): For NCCI edits, Medicare policies, and fee schedules. https://www.cms.gov

• American Academy of Orthopaedic Surgeons (AAOS): For clinical guidelines and educational materials on fracture care. https://www.aaos.org

• American Health Information Management Association (AHIMA): For credentials and resources for medical coders. https://www.ahima.org

• AAPC (formerly American Academy of Professional Coders): For certifications (CPC, COSC) and coding resources, particularly for orthopedic specialties. https://www.aapc.com

 

Date: August 29, 2025
Author: Orthopedic Coding & Reimbursement Specialist
Disclaimer: This article is for informational and educational purposes only and does not constitute medical, coding, or legal advice. The content is based on guidelines current as of the publication date. Medical coding is complex and constantly evolving. Always consult the latest official CPT® manual from the American Medical Association (AMA), applicable payer policies, and current coding resources for definitive guidance. The author and publisher are not responsible for any errors or omissions or for any consequences resulting from the use of this information.