Summary & Overview

CPT 21356: Depressed Cheekbone (Zygomatic) Fracture Repair

CPT code 21356 denotes open surgical repair of a depressed cheekbone (zygomatic) fracture accessed via an incision behind the hairline. This code captures a specific facial trauma reconstruction approach and is important for coding accuracy, surgical quality tracking, and payment adjudication across national payers. Accurate use of the code affects provider reimbursement, claims processing, and case mix reporting for facial trauma services.

Key payers covered in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare and Medicare. Readers will find a clinical and billing overview of the procedure captured by CPT code 21356, typical sites of service, common modifiers used with facial fracture repairs, and guidance on documentation elements that support coding. The publication outlines nationwide benchmarks and policy considerations where available and highlights practical clinical context for the procedure, such as indications for open reduction of depressed zygomatic fractures and typical operative setting.

Data not available in the input is noted where payer-specific rates, associated taxonomies, and ICD-10 pairings would normally appear.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 21356facial traumazygomatic fracture repairoral and maxillofacial surgerysurgical codingambulatory surgerytrauma surgery

Billing Code Overview

CPT code 21356 describes surgical repair of a depressed fracture of the cheekbone (zygomatic bone) resulting from blunt force trauma. The procedure is performed by accessing the fracture through an incision behind the hairline, allowing the surgeon to elevate and stabilize depressed bone segments.

Service type: Open surgical repair of facial bone fracture
Typical site of service: Inpatient or outpatient surgical setting, often an operating room or ambulatory surgery center

Clinical & Coding Specifications

Clinical Context

A 28-year-old male presents to the emergency department after an assault with blunt facial trauma. He has facial bruising, periorbital edema, cheek depression, and malar flattening on the right midface. Facial CT demonstrates a depressed zygomaticomaxillary complex (ZMC) fracture with step-off of the infraorbital rim and displacement of the lateral orbital rim. After initial airway, breathing, circulation stabilization and ophthalmologic evaluation to exclude globe injury, the patient is scheduled for open treatment of the depressed cheekbone fracture. The procedure is performed in an operating room under general anesthesia. The surgeon gains access via a coronal incision behind the hairline to expose the zygoma and zygomatic arch, elevates and reduces the depressed fragments, and fixes them with plates and screws as needed. The clinical workflow includes preoperative anesthesia assessment, surgical reduction and internal fixation, intraoperative imaging confirmation, postoperative monitoring in PACU, and outpatient follow-up for wound and hardware assessment.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when the procedure requires substantially greater work than typical due to complexity, extensive dissection, or prolonged operative time.
`23`	Unusual anesthesia	Use when medically necessary, but contraindications prevent standard general anesthesia and an unusual anesthetic is provided.
`26`	Professional component	Use when reporting only the surgeon's professional portion separate from technical facility charges (rare for this code).
`50`	Bilateral procedure	Use when the repair is performed on both left and right cheekbones and payer allows bilateral reporting adjustments.
`51`	Multiple procedures	Use when multiple distinct procedures are performed during the same operative session in addition to the described repair.
`52`	Reduced services	Use when the service is partially reduced or not completed as originally planned.
`59`	Distinct procedural service	Use to indicate a separate, distinct surgical service on the same date that is not normally reported together.
`62`	Two surgeons	Use when two surgeons work together as primary surgeons performing distinct portions of the procedure.
`78`	Return to operating room for related procedure same admission	Use when an unplanned return to the OR for related surgical treatment occurs during the same inpatient stay.
`79`	Unrelated procedure or service by the same physician during the postoperative period	Use when an unrelated procedure is performed during the global period (note: `79` is not in the provided modifier list; therefore do not use).
`80`	Assistant surgeon	Use when an assistant surgeon provides intraoperative assistance and payer requires reporting.
`81`	Minimum assistant surgeon	Use when a minimally qualifying assistant provides limited assistance and payer recognizes this modifier.
`62`	Co-surgeon (duplicate entry removed in table)	See `62` above.

Taxonomy Code	Specialty	Notes
2088P0102X	Plastic Surgery	Plastic surgeons commonly perform open reduction and internal fixation of depressed zygomatic fractures.
2086S0112X	Oral and Maxillofacial Surgery	Oral and maxillofacial surgeons frequently manage complex facial fractures using coronal approaches.
207X00000X	Otolaryngology (ENT)	Otolaryngologists with facial trauma expertise perform midface fracture repairs when indicated.
207RP0000X	General Surgery - Trauma Surgery	Trauma surgeons may perform or coordinate surgical repair in polytrauma settings.
225100000X	Ophthalmology	Ophthalmologists often participate for orbital rim or globe-related assessment and management.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`S02.41`	Fracture of malar and maxillary bones	Directly describes zygomatic (cheekbone) fractures treated with open reduction.
`S02.42`	Fracture of zygomatic arch	Identifies isolated zygomatic arch fractures that may require elevation via coronal approach.
`S02.5`	Fracture of nasal bones	Common associated facial fracture in blunt trauma; may be addressed in the same encounter.
`S02.6`	Fracture of mandible	Mandibular fractures can co-occur and change surgical planning or staging.
`S02.83`	Fracture of orbital floor	Orbital floor involvement often requires concurrent repair or orbital reconstruction.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`21330`	Open treatment of nasal bone fracture; with external splinting	Performed when associated nasal fractures require open reduction in the same operative session.
`21350`	Open treatment of mandibular fracture, with or without interdental fixation, complicated	Used when mandibular fractures are present and require open reduction and fixation in conjunction with midface repair.
`21248`	Open treatment of orbital floor fracture (blowout), with implant	Performed when the orbital floor is involved and requires reconstruction during zygomatic complex repair.
`20680`	Removal of deep implant; complicated (e.g., plates/screws)	Used if existing hardware is removed prior to reconstruction or revision of prior facial fixation.
`15740`	Implantation of soft tissue filler, major (e.g., free fat graft)	May be performed adjunctively for contour restoration after fracture reduction when soft tissue defects exist.