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CPT 21100: Halo Appliance for Maxillofacial Skeletal Distraction

CPT code 21100 covers the application of a halo-type appliance for maxillofacial skeletal distraction and advancement to address congenital or acquired defects from trauma, neoplasm, or degenerative conditions. This procedure facilitates gradual repositioning of the facial skeleton while enabling soft tissues to accommodate the change — an important option in complex reconstructive care where staged skeletal correction is required. Nationally, the code matters for surgical billing, device coverage, and post-operative management pathways in maxillofacial and reconstructive services.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical and coding overview, typical sites of service, and the range of payers commonly engaged in coverage decisions. The publication outlines what stakeholders should know about service delivery and billing context, and provides benchmarks and policy-relevant considerations where available.

The content is intended for hospital coders, surgical practices, billing professionals, and policy analysts looking for a clear summary of the code's clinical intent, typical care settings, and payer landscape. Data not available in the input is indicated where applicable.

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Billing Code Overview

CPT code 21100 describes the application of a halo-type appliance used to treat maxillofacial defects that are congenital or acquired (for example, from trauma, bone growth disturbance, neoplastic, or degenerative processes). The appliance permits gradual skeletal lengthening and advancement, allowing the skin and soft tissue envelope to adapt to skeletal movement.

Service type: Surgical orthopedic/maxillofacial appliance placement and skeletal distraction.

Typical site of service: Inpatient hospital or ambulatory surgical center (operating room or procedure suite) for operative placement and device activation, with subsequent outpatient visits for adjustments and monitoring.

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CPT 21100: Halo Appliance for Maxillofacial Skeletal Distraction

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Billing Code Overview

Service type: Surgical orthopedic/maxillofacial appliance placement and skeletal distraction.

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult or adolescent with midface or mandibular deficiency from congenital deformity (eg, cleft-related hypoplasia), posttraumatic segmental bone loss, or growth disturbance secondary to infection or radiation. The patient presents to a craniofacial or maxillofacial surgery clinic with functional impairment (malocclusion, airway compromise, or facial asymmetry) and aesthetic concern. Preoperative planning includes clinical exam, dental/occlusal assessment, and 3D imaging (CT or CBCT) to evaluate bone segments and soft tissue envelope. The surgeon discusses the staged plan for distraction osteogenesis and applies a halo-type external appliance in the operating room under general anesthesia. The appliance is secured to the craniofacial skeleton and soft tissues to allow controlled, gradual skeletal lengthening and advancement over weeks. Postoperative workflow includes instruction on activation protocols, outpatient follow-up visits for activation and pin-site care, radiographic monitoring of regenerate bone formation, and subsequent device removal under anesthesia when consolidation is sufficient. Typical sites of service are hospital inpatient or outpatient surgery center and specialty ambulatory clinics for follow-up.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when the procedure required substantially greater work than typical (extensive dissection, unusual complexity).
`23`	Unusual anesthesia circumstances	Use when the procedure is performed under general anesthesia for a normally non-general case due to patient condition.
`26`	Professional component	Use when reporting only the physician’s professional component separate from technical services.
`52`	Reduced services	Use when a reduced or partial procedure is performed.
`53`	Discontinued procedure	Use when the procedure is started but terminated due to extenuating circumstances.
`62`	Two surgeons	Use when two surgeons from different specialties participate substantially in the procedure.
`66`	Surgical team (co-surgery)	Use when physicians perform distinct portions of a complex procedure together.
`78`	Unplanned return to OR	Use for an unplanned return to the operating room for related treatment during the global period.
`80`	Assistant surgeon	Use when a qualified assistant surgeon performs part of the procedure.
`81`	Minimum assistant surgeon	Use when minimal assistance is provided.
`59`	Distinct procedural service	Use to indicate a separate, distinct procedure or service not usually reported together.
`73`	Discontinued outpatient hospital/ASC prior to anesthesia	Use when procedure cancelled after patient prepared but before anesthesia for outpatient/ASC.
`76`	Repeat procedure by same physician	Use when the same procedure is repeated later same day.
`TC`	Technical component	Use when billing only the technical component of the service (equipment, supplies).

Taxonomy Code	Specialty	Notes
207P00000X	Oral and Maxillofacial Surgery	Primary specialty performing maxillofacial distraction osteogenesis and halo appliance placement.
2080P0202X	Plastic Surgery (Craniofacial)	Craniofacial plastic surgeons perform complex facial skeletal reconstruction and distraction.
207L00000X	Otolaryngology – Head & Neck Surgery	Surgeons may manage airway and midface procedures in combined approaches.
208100000X	Orthodontics	Orthodontists participate in occlusal planning and post-distraction dental management.
261Q00000X	General Surgery (Trauma)	Trauma/craniofacial teams may perform in acute posttraumatic settings.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Q67.0`	Congenital malformation of mandible	Mandibular hypoplasia requiring skeletal lengthening via halo-type distraction.
`Q67.3`	Other congenital deformities of skull and face bones	Congenital midface deficiencies addressed with distraction osteogenesis.
`S02.6XXA`	Fracture of mandible, initial encounter	Posttraumatic segmental defects or malunions that may require halo appliance for gradual correction.
`S02.4XXA`	Fracture of malar and maxillary bones, initial encounter	Midface trauma leading to bone loss or deformity corrected with external distraction.
`M85.6`	Acquired deformity of facial bones	Degenerative or acquired deformities treated with skeletal advancement.
`C41.2`	Malignant neoplasm of mandible	Resection defects from neoplasia that may require staged distraction reconstruction.
`K07.6`	Dentofacial anomalies, unspecified	Severe occlusal and skeletal discrepancies managed with distraction osteogenesis.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`21045`	Reconstruction of mandible or maxilla, open; with internal rigid fixation of continuity defects of mandible or maxilla requiring bone grafting	May be performed before or during definitive reconstruction when internal fixation or grafting is required in conjunction with skeletal distraction.
`21087`	Reconstruction, mandible or maxilla, open, with external fixation (e.g., halo)	External fixation procedures for maxillofacial reconstruction often used alternatively or in combination with halo appliances.
`21215`	Reconstruction, midface, LeFort I; with or without bone graft	Performed for midface advancement; distraction with halo appliance may precede or follow LeFort osteotomy procedures.
`20930`	Allograft, morselized (eg, for craniofacial defects); first location	Bone grafting codes used when grafting is performed to augment regenerate or fill defects during reconstruction.
`21071`	Reconstruction of orbital floor, etc.; with bone graft, or implant	Associated orbital or periorbital reconstructions that may be part of comprehensive craniofacial correction alongside distraction therapy.

CPT 21110: Interdental Fixation Device Placement for Jaw Stabilization

CPT-21116-TMJ-ARTHROGRAPHY-CONTRAST-INJECTION

CPT 21116: TMJ Arthrography Contrast Injection

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when the procedure required substantially greater work than typical (extensive dissection, unusual complexity).
`23`	Unusual anesthesia circumstances	Use when the procedure is performed under general anesthesia for a normally non-general case due to patient condition.
`26`	Professional component	Use when reporting only the physician’s professional component separate from technical services.
`52`	Reduced services	Use when a reduced or partial procedure is performed.
`53`	Discontinued procedure	Use when the procedure is started but terminated due to extenuating circumstances.
`62`	Two surgeons	Use when two surgeons from different specialties participate substantially in the procedure.
`66`	Surgical team (co-surgery)	Use when physicians perform distinct portions of a complex procedure together.
`78`	Unplanned return to OR	Use for an unplanned return to the operating room for related treatment during the global period.
`80`	Assistant surgeon	Use when a qualified assistant surgeon performs part of the procedure.
`81`	Minimum assistant surgeon	Use when minimal assistance is provided.
`59`	Distinct procedural service	Use to indicate a separate, distinct procedure or service not usually reported together.
`73`	Discontinued outpatient hospital/ASC prior to anesthesia	Use when procedure cancelled after patient prepared but before anesthesia for outpatient/ASC.
`76`	Repeat procedure by same physician	Use when the same procedure is repeated later same day.
`TC`	Technical component	Use when billing only the technical component of the service (equipment, supplies).

Taxonomy Code	Specialty	Notes
207P00000X	Oral and Maxillofacial Surgery	Primary specialty performing maxillofacial distraction osteogenesis and halo appliance placement.
2080P0202X	Plastic Surgery (Craniofacial)	Craniofacial plastic surgeons perform complex facial skeletal reconstruction and distraction.
207L00000X	Otolaryngology – Head & Neck Surgery	Surgeons may manage airway and midface procedures in combined approaches.
208100000X	Orthodontics	Orthodontists participate in occlusal planning and post-distraction dental management.
261Q00000X	General Surgery (Trauma)	Trauma/craniofacial teams may perform in acute posttraumatic settings.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Q67.0`	Congenital malformation of mandible	Mandibular hypoplasia requiring skeletal lengthening via halo-type distraction.
`Q67.3`	Other congenital deformities of skull and face bones	Congenital midface deficiencies addressed with distraction osteogenesis.
`S02.6XXA`	Fracture of mandible, initial encounter	Posttraumatic segmental defects or malunions that may require halo appliance for gradual correction.
`S02.4XXA`	Fracture of malar and maxillary bones, initial encounter	Midface trauma leading to bone loss or deformity corrected with external distraction.
`M85.6`	Acquired deformity of facial bones	Degenerative or acquired deformities treated with skeletal advancement.
`C41.2`	Malignant neoplasm of mandible	Resection defects from neoplasia that may require staged distraction reconstruction.
`K07.6`	Dentofacial anomalies, unspecified	Severe occlusal and skeletal discrepancies managed with distraction osteogenesis.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`21045`	Reconstruction of mandible or maxilla, open; with internal rigid fixation of continuity defects of mandible or maxilla requiring bone grafting	May be performed before or during definitive reconstruction when internal fixation or grafting is required in conjunction with skeletal distraction.
`21087`	Reconstruction, mandible or maxilla, open, with external fixation (e.g., halo)	External fixation procedures for maxillofacial reconstruction often used alternatively or in combination with halo appliances.
`21215`	Reconstruction, midface, LeFort I; with or without bone graft	Performed for midface advancement; distraction with halo appliance may precede or follow LeFort osteotomy procedures.
`20930`	Allograft, morselized (eg, for craniofacial defects); first location	Bone grafting codes used when grafting is performed to augment regenerate or fill defects during reconstruction.
`21071`	Reconstruction of orbital floor, etc.; with bone graft, or implant	Associated orbital or periorbital reconstructions that may be part of comprehensive craniofacial correction alongside distraction therapy.

CPT 21110: Interdental Fixation Device Placement for Jaw Stabilization

CPT-21116-TMJ-ARTHROGRAPHY-CONTRAST-INJECTION

CPT 21116: TMJ Arthrography Contrast Injection

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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CPT 21100: Halo Appliance for Maxillofacial Skeletal Distraction

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Billing Code Overview

OpenPayer

CPT 21100: Halo Appliance for Maxillofacial Skeletal Distraction

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References