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Official Description

Coronoidectomy (separate procedure)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The procedure described by CPT® Code 21070 refers to a coronoidectomy, which is a surgical intervention involving the removal of the coronoid process of the mandible. The coronoid process is a bony projection on the mandible where the temporalis muscle attaches, playing a crucial role in the movement of the jaw. This procedure is typically performed to address conditions that may cause limitations in jaw movement or to alleviate pain associated with the coronoid process. The surgery is conducted through an intraoral incision, which means that the incision is made inside the mouth, minimizing external scarring. During the procedure, the surgeon carefully reflects the surrounding tissue away from the mandible to access the coronoid process. Once exposed, the coronoid process is clamped and excised using various surgical instruments, including drills, saws, files, and osteotomes, which are specialized tools designed for cutting bone. After the excision is completed, the incision is closed primarily, meaning that the edges of the incision are brought together and sutured without the use of additional materials or techniques. This procedure is classified as a separate procedure, indicating that it is distinct from other surgical interventions that may be performed in conjunction with it.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The coronoidectomy procedure is indicated for specific conditions that affect the coronoid process of the mandible. These indications may include:

  • Limited Jaw Movement The procedure may be performed to alleviate restrictions in jaw mobility, which can be caused by an enlarged or abnormally positioned coronoid process.
  • Pain Management Patients experiencing chronic pain associated with the coronoid process may benefit from this surgical intervention to relieve discomfort.
  • Temporomandibular Joint Disorders (TMJ) In some cases, the coronoidectomy may be indicated as part of the treatment for TMJ disorders, particularly when the coronoid process contributes to the dysfunction.

2. Procedure

The coronoidectomy procedure involves several key steps that are performed with precision to ensure successful removal of the coronoid process. The steps include:

  • Step 1: Intraoral Incision The surgeon begins by making an incision inside the mouth, specifically in the area adjacent to the mandible. This approach is chosen to minimize external scarring and to provide direct access to the coronoid process.
  • Step 2: Tissue Reflection After the incision is made, the surgeon carefully reflects the surrounding soft tissue away from the mandible. This step is crucial as it exposes the coronoid process for the subsequent excision.
  • Step 3: Clamping and Excision Once the coronoid process is adequately exposed, the surgeon clamps it to stabilize the area. The excision is then performed using a combination of surgical instruments, which may include drills, saws, files, and osteotomes. These tools are utilized to carefully cut and remove the coronoid process from the mandible.
  • Step 4: Closure of the Incision After the coronoid process has been successfully excised, the surgeon proceeds to close the incision primarily. This involves bringing the edges of the incision together and suturing them to promote healing.

3. Post-Procedure

Following the coronoidectomy, patients can expect specific post-procedure care and recovery considerations. It is important for patients to follow their surgeon's instructions regarding pain management, oral hygiene, and activity restrictions. Swelling and discomfort in the surgical area are common, and appropriate pain relief measures may be recommended. Patients should also be advised to maintain a soft diet for a period following the surgery to avoid strain on the jaw. Regular follow-up appointments may be scheduled to monitor healing and assess the success of the procedure. Overall, the recovery process will vary among individuals, and adherence to post-operative care is essential for optimal outcomes.

Short Descr REMOVE CORONOID PROCESS
Medium Descr CORONOIDECTOMY SEPARATE PROCEDURE
Long Descr Coronoidectomy (separate procedure)
Status Code Active Code
Global Days 090 - Major Surgery
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 2 - Standard payment adjustment rules for multiple procedures apply.
Bilateral Surgery (50) 1 - 150% payment adjustment for bilateral procedures applies.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 0 - Payment restriction for assistants at surgery applies to this procedure...
Co-Surgeons (62) 0 - Co-surgeons not permitted for this procedure.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Hospital Part B services paid through a comprehensive APC
ASC Payment Indicator Surgical procedure on ASC list in CY 2007; payment based on OPPS relative payment weight.
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P3D - Major procedure, orthopedic - other
MUE 1
CCS Clinical Classification 142 - Partial excision bone
22 Increased procedural services: when the work required to provide a service is substantially greater than typically required, it may be identified by adding modifier 22 to the usual procedure code. documentation must support the substantial additional work and the reason for the additional work (ie, increased intensity, time, technical difficulty of procedure, severity of patient's condition, physical and mental effort required). note: this modifier should not be appended to an e/m service.
50 Bilateral procedure: unless otherwise identified in the listings, bilateral procedures that are performed at the same session, should be identified by adding modifier 50 to the appropriate 5 digit code. note: this modifier should not be appended to designated "add-on" codes (see appendix d).
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
53 Discontinued procedure: under certain circumstances, the physician or other qualified health care professional may elect to terminate a surgical or diagnostic procedure. due to extenuating circumstances or those that threaten the well being of the patient, it may be necessary to indicate that a surgical or diagnostic procedure was started but discontinued. this circumstance may be reported by adding modifier 53 to the code reported by the individual for the discontinued procedure. note: this modifier is not used to report the elective cancellation of a procedure prior to the patient's anesthesia induction and/or surgical preparation in the operating suite. for outpatient hospital/ambulatory surgery center (asc) reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
78 Unplanned return to the operating/procedure room by the same physician or other qualified health care professional following initial procedure for a related procedure during the postoperative period: it may be necessary to indicate that another procedure was performed during the postoperative period of the initial procedure (unplanned procedure following initial procedure). when this procedure is related to the first, and requires the use of an operating/procedure room, it may be reported by adding modifier 78 to the related procedure. (for repeat procedures, see modifier 76.)
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
GC This service has been performed in part by a resident under the direction of a teaching physician
LT Left side (used to identify procedures performed on the left side of the body)
RT Right side (used to identify procedures performed on the right side of the body)
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
Date
Action
Notes
2013-01-01 Changed Medium Descriptor changed.
Pre-1990 Added Code added.
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