Summary & Overview
CPT 21046: Excision of Benign Tumor or Cyst of Mandible, Open Procedure
CPT code 21046 denotes an open surgical excision of a cyst or benign tumor of the mandible, using either an intraoral or extraoral approach; for aggressive lesions, intraoral osteotomy may be required to fully remove the lesion. This code is clinically significant because it covers definitive surgical management for nonmalignant mandibular lesions that can impact oral function, facial structure, and airway considerations. Nationally, procedures billed under this code are relevant to surgical, oral and maxillofacial, and otolaryngology service lines and intersect both hospital-based and ambulatory surgical settings.
Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise breakdown of the service type and typical sites of service, payer coverage considerations, common billing modifiers associated with surgical services, and the clinical context that informs coding choices. The publication summarizes benchmark elements and policy-relevant considerations affecting reimbursement and claims processing at a national level, and clarifies coding scope for intraoral versus extraoral approaches and when osteotomy is performed.
Data not available in the input for associated taxonomies, specific ICD-10 diagnoses, and payer-specific rates are noted where applicable.
Billing Code Overview
CPT code 21046 describes the open surgical excision of a cyst or other benign (noncancerous) tumor of the mandible (lower jaw bone). The procedure may be performed via an intraoral approach (through the mouth) or an extraoral approach (through the skin). For aggressive or fast-growing lesions, the surgeon may perform an intraoral osteotomy to cut into bone and achieve complete excision of the tumor.
Service Type: Surgical excision of mandibular benign tumor, open procedure
Typical Site of Service: Operating room or procedure suite, with intraoral cases potentially performed in procedure rooms and extraoral cases typically performed in an operating room under appropriate anesthesia.
Clinical & Coding Specifications
Clinical Context
A 34-year-old adult presents with a progressively enlarging, painless swelling along the left lower jaw. Imaging (panoramic radiograph and CT) demonstrates a well‑circumscribed radiolucent lesion within the body of the mandible consistent with an odontogenic keratocyst or benign ameloblastoma. The oral and maxillofacial surgery team evaluates the patient in clinic, reviews imaging, obtains informed consent, and schedules an operative procedure under general anesthesia in an ambulatory surgery center or hospital operating room. The planned operation is an open excision of the cystic or benign tumor of the mandible using an intraoral approach when feasible; for larger or aggressive tumors an intraoral osteotomy with marginal mandibulectomy may be performed to achieve complete excision. Intraoperative steps include exposure of the lesion, careful resection of the cyst or tumor with margin control, curettage or peripheral ostectomy as indicated, hemostasis, and layered closure. Postoperative care includes short inpatient observation or same‑day discharge depending on extent of surgery, pain control, antibiotic coverage if indicated, and follow‑up imaging and clinic visits to monitor healing and detect recurrence.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the procedure requires substantially greater work (extensive dissection, unexpected complexity) than typical for 21046. |
23 | Unusual anesthesia | Use when general anesthesia is required for a procedure usually performed under local anesthesia due to patient factors. |
52 | Reduced services | Use when a partially completed excision is performed (e.g., aborted due to unexpected findings). |
53 | Discontinued procedure | Use when the operative procedure is started but terminated for reasons unrelated to patient condition (e.g., equipment failure). |
54 | Surgical care only | Use when billing only for the surgeon's intraoperative services and another provider bills for pre/postoperative care. |
55 | Postoperative management only | Use when billing only for postoperative follow‑up care after another surgeon performed the operation. |
62 | Two surgeons | Use when two surgeons of different specialties perform distinct surgical portions (e.g., ablative resection and microvascular reconstruction billed separately). |
63 | Procedure performed on infants less than 4 kg | Rarely applicable; use only for qualifying neonatal patients. |
78 | Return to operating room for a related procedure during the postoperative period | Use when a postoperative complication requires return to the OR for re‑excision or hematoma evacuation. |
79 | Unrelated procedure or service by the same physician during the postoperative period | Use when an unrelated surgical procedure is performed during the global period (note: 79 is not in the provided list; do not use). |
59 | Distinct procedural service | Use when a separate, distinct surgical service (e.g., biopsy of a different site) is performed the same day. |
76 | Repeat procedure by same physician | Use when the same procedure is repeated later the same day. |
RT | Right side | Use to identify procedures performed on the right side of the mandible. |
LT | Left side | Use to identify procedures performed on the left side of the mandible. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 207Y00000X | Oral and Maxillofacial Surgery | Primary specialty performing mandible tumor excision, including intraoral approaches and osteotomies. |
| 2080P0220X | Plastic Surgery | Performs resections with reconstructive procedures when soft tissue or bony reconstruction is required. |
| 208C00000X | Otolaryngology (ENT) | Manages head and neck tumors with access to mandibular resections in complex cases. |
| 207K00000X | General Dentistry (Oral Surgery) | Provides surgical excision for smaller cysts/tumors accessible intraorally in dental clinics or ambulatory settings. |
| 208600000X | Orthopedic Surgery of the Spine? | Data not available in the input. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
| Data not available in the input. | Data not available in the input. | Data not available in the input. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
21046 | Excision of cyst or benign tumor of mandible, other than odontogenic cyst; intraoral or extraoral approach | Primary procedure code describing open excision of benign mandibular lesions. |
21044 | Excision of benign tumor of mandible; limited | May describe smaller or more limited resections of mandibular lesions when less extensive than 21046. |
21047 | Radical resection of mandible for benign disease; segmental mandibulectomy with plating | Used for more extensive resections where segmental mandibulectomy is required instead of a localized excision. |
21090 | Bone graft for reconstruction of mandible (autograft) | Used when bony reconstruction is performed immediately or delayed after tumor excision. |
41899 | Unlisted procedure, dentoalveolar structures | Used for ancillary or atypical procedures of the mandible not described by specific CPT codes (billing requires operative report). |