CPT 21421 Maxillary Fracture Reimbursement | OpenPayer

Summary & Overview

CPT 21421: Maxillary Fracture Reduction and Splinting

CPT code 21421 represents closed reduction and splinting treatment for fractures of the maxilla (the roof of the mouth or upper jaw). This procedure addresses facial trauma from blunt force and is performed by oral and maxillofacial surgeons or other qualified providers to restore anatomy, stabilize bone segments, and allow healing. Nationally, proper coding for facial fracture management affects surgical case mix reporting, hospital throughput, and trauma care reimbursement.

Key payers typically involved include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides a clinical and billing-focused overview that clarifies the code’s clinical scope, expected sites of service, and common procedural context. Readers will find benchmarks and coding considerations, an outline of common modifiers seen with surgical fracture care, and clinical context to aid accurate claim reporting.

This summary is targeted to coding professionals, revenue cycle staff, and clinical leaders interested in procedural classification and billing consistency for maxillofacial fracture management. Data not available in the input is noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 21421maxillofacial fracturefracture reductionoral and maxillofacial surgerysurgical procedurestrauma carehospital outpatientemergency department

Billing Code Overview

CPT code 21421 describes treatment for a fracture of the roof of the mouth or upper jaw bone (maxilla) typically caused by blunt force trauma. The service involves manipulation and splinting to reduce and stabilize the fracture.

Service type: Surgical fracture management involving closed reduction and intraoral or external splinting techniques
Typical site of service: Hospital inpatient or outpatient surgical setting, emergency department, or oral and maxillofacial surgery clinic

Clinical & Coding Specifications

Clinical Context

A 28-year-old male presents to the emergency department after an assault with blunt facial trauma. He reports facial pain, malocclusion, bleeding from the mouth, and numbness of the upper lip. On exam there is mobility of the maxillary alveolar segment and step-off along the maxillary arch. Facial and intraoral radiographs and CT confirm a fracture of the maxilla involving the maxillary alveolar process and anterior maxillary wall (roof of the mouth/upper jaw). The patient is taken to the procedure room where an oral and maxillofacial surgeon performs closed reduction with manipulation and intraoral splinting under local anesthesia with conscious sedation. The clinician documents pre-procedure consent, fracture location, neurovascular status, manipulation technique, type of splint applied, post-reduction occlusion, and follow-up instructions.

Typical site of service: hospital emergency department procedure room, ambulatory surgery center, or outpatient oral and maxillofacial surgery clinic.

Service type: closed treatment (manipulation) and splinting of a maxillary fracture (non-open reduction).

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work required is substantially greater than typical for `21421` and documentation supports additional work.

CPT 21355: Closed Reduction of Zygoma (Cheekbone) Fracture via Puncture Incisions

CPT-21360-ZYGOMATIC-CHEEKBONE-DEPRESSED-FRACTURE-REPAIR-OPEN

CPT 21360: Repair of Depressed Zygomatic (Cheekbone) Fracture

CPT-21440-CLOSED-TREATMENT-ALVEOLAR-RIDGE-FRACTURE-MANIPULATION

CPT 21440: Closed Treatment of Alveolar Ridge Fracture, Manipulation

CPT-21485-TMJ-DISLOCATION-REDUCTION-WITH-FIXATION

CPT 21485: TMJ Dislocation Reduction with Fixation

CPT-21454-MANDIBULAR-FRACTURE-EXTERNAL-FIXATION

CPT 21454: Mandibular Fracture Repair with External Fixation

CPT-21340-NASAL-ETHMOID-FRACTURE-OPEN-REPAIR

CPT 21340: Open Repair of Nasal and Ethmoid Fracture

CPT-21336-NASAL-SEPTUM-FRACTURE-REDUCTION-OPEN

CPT 21336: Reduction of Nasal Septum Fracture, Open Approach

CPT-21490-TMJ-DISLOCATION-OPEN-REDUCTION

CPT 21490: Open Reduction of Dislocated Temporomandibular Joint

CPT-21325-NASAL-FRACTURE-REDUCTION-NASAL-INCISION

CPT 21325: Nasal Fracture Reduction via Nasal Incision

CPT-21395-ORBITAL-FLOOR-REPAIR-AUTOLOGOUS-BONE-GRAFT

CPT 21395: Orbital Floor Repair with Autologous Bone Graft

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Taxonomy Code	Specialty	Notes
`207Q00000X`	Oral and Maxillofacial Surgery	Primary specialty performing closed reduction and splinting of maxillary fractures.
`207L00000X`	Plastic Surgery	Often involved when facial fractures require complex reconstruction or combined management.
`2080P0202X`	Emergency Medicine	Initial evaluation, stabilization, and often procedural sedation in the ED for acute facial fractures.
`207R00000X`	General Dentistry	May perform intraoral splinting and occlusal stabilization in outpatient settings.
`208200000X`	Anesthesiology	Provides sedation or general anesthesia when required for manipulation and splinting.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`S02.4XXA`	Fracture of malar and maxillary bones, initial encounter for closed fracture	Common code for initial encounter of maxillary fractures treated with closed reduction and splinting.
`S02.5XXA`	Fracture of tooth (alveolar process), initial encounter for closed fracture	Captures alveolar process injuries that often accompany maxillary fractures and justify splinting.
`S02.6XXA`	Fracture of orbital floor, initial encounter	May be associated facial fracture requiring coordinated management with maxillary reduction.
`S00.83XA`	Contusion of other part of head, initial encounter	Associated soft tissue injury commonly documented with facial fractures.
`S01.4XXA`	Open wound of lip and oral cavity, initial encounter	Lacerations or mucosal disruptions that accompany palate/maxillary fractures and influence repair approach.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`21422`	Open treatment of palatal or maxillary fracture, with or without internal fixation, including obtaining bone graft if performed; complicated	Performed when closed manipulation/splinting (`21421`) is insufficient and open reduction with fixation is required.
`21420`	Closed treatment of palatal or maxillary fracture; without splinting	Alternative closed management code when manipulation is performed but no splinting is applied.
`21240`	Reconstruction, maxilla, partial (eg, for post-traumatic defects)	Performed for more extensive reconstructive needs following comminuted fractures or tissue loss not addressed by `21421`.
`70336`	Computed tomography, maxillofacial area; without contrast	Common diagnostic study obtained preoperatively to define fracture anatomy guiding reduction and splinting.
`70371`	Radiologic examination, mandible, complete series; 2 views	Adjunct plain radiographs of the facial bones used in initial evaluation and follow-up of fracture reduction.
`99100`	Anesthesia for patient of extreme age, younger than 1 year and older than 70 years	(Example of anesthesia adjunct codes that may apply in select populations) Used when anesthesia considerations modify perioperative management; billed per payer rules.

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