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Official Description

Craniofacial approach to anterior cranial fossa; extradural, including lateral rhinotomy, orbital exenteration, ethmoidectomy, sphenoidectomy and/or maxillectomy

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 61581 refers to a surgical procedure known as a craniofacial approach to the anterior cranial fossa, specifically performed in an extradural manner. This complex procedure is designed to expose lesions located in the extradural space, which is the area outside the dura mater, the outermost layer of the protective covering of the brain. The approach involves a combination of surgical techniques, including lateral rhinotomy, orbital exenteration, ethmoidectomy, sphenoidectomy, and/or maxillectomy. Each of these techniques serves a specific purpose in accessing the targeted area effectively. The lateral rhinotomy involves an incision that begins at the medial edge of the eyebrow and extends down the side of the nose, allowing access to the nasal and facial structures. The orbital exenteration entails the removal of the eyeball and surrounding orbital contents, which is crucial when dealing with malignant tumors that have invaded the periorbital region. Ethmoidectomy and sphenoidectomy involve the complete resection of the mucosa and bone of the ethmoid and sphenoid sinuses, respectively, to facilitate access to the extradural lesion. This procedure is typically indicated for patients with malignant tumors that have spread to the maxillary sinus and may require extensive resection of surrounding structures to ensure complete removal of the tumor and to preserve neurovascular integrity during the operation.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 61581 is indicated for the surgical management of malignant tumors that have invaded the maxillary sinus and potentially the periorbital region. The following conditions may warrant this approach:

  • Malignant Tumors Tumors that have extended into the maxillary sinus and surrounding structures, necessitating extensive surgical intervention.
  • Periorbital Invasion Tumors that have invaded the periorbital region, requiring removal of orbital contents to achieve complete resection.

2. Procedure

The procedure involves several critical steps to ensure effective access to the extradural lesion:

  • Step 1: Incision Creation The surgical process begins with a lateral rhinotomy incision, which starts at the medial edge of the eyebrow and extends down the side of the nose, around the nasal ala, and down the center of the lip. A second incision is made from the upper aspect of the side of the nose to the inner canthus, continuing below the eye to the outer canthus and along the maxilla into the temporal region.
  • Step 2: Mobilization of the Facial Nerve The facial nerve is carefully mobilized and transected using a technique that allows for reanastomosis at the conclusion of the procedure. This step is crucial for preserving facial function post-surgery.
  • Step 3: Subperiosteal Dissection A subperiosteal dissection is performed to access the intraorbital nerve, which is also transected and tagged for identification during the procedure.
  • Step 4: Flap Creation A flap is created that includes the upper lip, cheek, lower eyelid, and parotid gland, facilitating further access to the surgical site.
  • Step 5: Resection of Sinus Structures The mucosa and bone of the ethmoid and sphenoid sinuses are completely resected (ethmoidectomy and sphenoidectomy) to provide adequate exposure to the extradural lesion.
  • Step 6: Orbital Exenteration In this specific procedure, an orbital exenteration is performed, which typically requires a maxillectomy. An incision is made in the superior aspect of the eyelid, extending around the entire circumference of the eye, including the skin around the outer and inner canthi. This incision is carried through the subcutaneous tissues and into the periosteum around the orbital rim.
  • Step 7: Removal of Orbital Contents Periorbital elevators are utilized to free the periosteum from the underlying bone, allowing for the en bloc removal of the eyeball and all contents of the orbit. This step is critical for exposing the lesion.
  • Step 8: Lesion Dissection Once all neurovascular structures are identified and preserved, the dissection of the lesion begins. This step is reported separately, emphasizing the complexity and importance of careful handling during the procedure.

3. Post-Procedure

Post-procedure care involves monitoring for complications related to the extensive surgical intervention. Patients may require pain management and close observation for signs of infection or neurological deficits due to the involvement of critical structures such as the facial nerve. Recovery may involve rehabilitation to address any functional impairments resulting from the surgery, particularly concerning facial movement and appearance. Follow-up appointments are essential to assess healing and to plan any additional treatments, such as radiation or chemotherapy, if indicated for the underlying malignancy.

Short Descr CRANIOFACIAL APPROACH SKULL
Medium Descr CRANIOFACIAL ANT CRANIAL FOSSA W/ORBITAL EXNTJ
Long Descr Craniofacial approach to anterior cranial fossa; extradural, including lateral rhinotomy, orbital exenteration, ethmoidectomy, sphenoidectomy and/or maxillectomy
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) 1 - Statutory payment restriction for assistants at surgery applies to this procedure...
Co-Surgeons (62) 2 - Co-surgeons permitted and no documentation required if the two- specialty requirement is met.
Team Surgery (66) 2 - Team surgeons permitted; pay by report.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Inpatient Procedures, not paid under OPPS
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P1G - Major procedure - Other
MUE 1
CCS Clinical Classification 9 - Other OR therapeutic nervous system procedures

This is a primary code that can be used with these additional add-on codes.

69990 Addon Code MPFS Status: Restricted APC N ASC N1 PUB 100 CPT Assistant Article 1Microsurgical techniques, requiring use of operating microscope (List separately in addition to code for primary procedure)
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).
62 Two surgeons: when 2 surgeons work together as primary surgeons performing distinct part(s) of a procedure, each surgeon should report his/her distinct operative work by adding modifier 62 to the procedure code and any associated add-on code(s) for that procedure as long as both surgeons continue to work together as primary surgeons. each surgeon should report the co-surgery once using the same procedure code. if additional procedure(s) (including add-on procedure(s) are performed during the same surgical session, separate code(s) may also be reported with modifier 62 added. note: if a co-surgeon acts as an assistant in the performance of additional procedure(s), other than those reported with the modifier 62, during the same surgical session, those services may be reported using separate procedure code(s) with modifier 80 or modifier 82 added, as appropriate.
82 Assistant surgeon (when qualified resident surgeon not available): the unavailability of a qualified resident surgeon is a prerequisite for use of modifier 82 appended to the usual procedure code number(s).
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)
Date
Action
Notes
2011-01-01 Changed Short description changed.
1994-01-01 Added First appearance in code book in 1994.
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