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Official Description

Craniectomy, suboccipital with cervical laminectomy for decompression of medulla and spinal cord, with or without dural graft (eg, Arnold-Chiari malformation)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The procedure described by CPT® Code 61343 is a craniectomy performed in the suboccipital region, accompanied by a cervical laminectomy aimed at decompressing the medulla and spinal cord. This surgical intervention is particularly indicated for conditions such as Arnold-Chiari malformation, where bony defects in the suboccipital area of the skull and the cervical spine (specifically at the C1 and C2 vertebrae) exert pressure on critical neurological structures. The medulla oblongata, which is the lower part of the brainstem and transitions into the spinal cord, can be adversely affected by this compression, leading to a range of neurological symptoms. These symptoms may include dizziness, muscle weakness, numbness, visual disturbances, headaches, and difficulties with balance and coordination. The procedure involves meticulous surgical techniques to alleviate this pressure, thereby restoring normal function and alleviating the associated symptoms. The surgical approach includes securing the patient's head in a neutral position, making a midline incision, and carefully exposing the relevant anatomical structures to perform the necessary decompression effectively.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure is indicated for the following conditions:

  • Arnold-Chiari malformation - A condition where the brain tissue extends into the spinal canal due to structural defects in the skull and spine, leading to compression of the medulla and spinal cord.
  • Compression symptoms - Symptoms such as dizziness, muscle weakness, numbness, vision problems, headaches, and balance and coordination issues resulting from bony defects in the suboccipital region.

2. Procedure

The surgical procedure involves several critical steps to ensure effective decompression of the medulla and spinal cord:

  • Step 1: Patient positioning - The patient's head is fixed in a neutral position using tongs or a Mayfield head holder to provide stability throughout the procedure.
  • Step 2: Incision and exposure - A midline incision is made over the lower aspect of the skull, allowing access to the occiput and the C1 and C2 vertebrae. This step is crucial for exposing the areas that require surgical intervention.
  • Step 3: Harvesting grafts - If necessary, a pericranial graft is harvested to be used later for dural enlargement.
  • Step 4: Laminectomy retraction - Laminectomy retractors are placed at the superior and inferior margins of the wound to maintain visibility and access to the surgical site.
  • Step 5: Removal of spinous processes and laminae - The spinous processes at C1 and C2 are removed using a cutting rongeur, followed by the removal of the laminae with a punch rongeur. This step is essential for relieving pressure on the spinal cord.
  • Step 6: Incision of ligamentum flavum - The ligamentum flavum may be incised as needed to facilitate further decompression.
  • Step 7: Creation of burr holes - Burr holes are created in the suboccipital region, and a saw is used to connect these holes, forming a bone flap that extends to the posterior margin of the foramen magnum.
  • Step 8: Removal of the foramen magnum margin - The posterior margin of the foramen magnum is removed using a high-speed drill, allowing for additional decompression.
  • Step 9: Elevation of the bone flap - The bone flap is elevated to access the underlying structures for decompression.
  • Step 10: Dural opening and grafting - Decompression of the medulla and spinal cord may necessitate opening the dura. The dura is then enlarged using the previously harvested pericranial graft, or alternatively, a cultured dermal graft or synthetic patch graft may be utilized.
  • Step 11: Suturing the dura - The dura and the dural graft are tightly sutured to prevent cerebrospinal fluid leakage, ensuring a secure closure.
  • Step 12: Drain placement - A drain may be placed to manage any excess fluid accumulation post-surgery.
  • Step 13: Replacement of the bone flap - Finally, the bone flap is replaced and anchored in position using steel sutures to secure it effectively.

3. Post-Procedure

Post-procedure care involves monitoring the patient for any signs of complications, such as cerebrospinal fluid leakage or infection. The patient may require a period of recovery in a hospital setting, where vital signs and neurological status are closely observed. Pain management and rehabilitation may be necessary to aid recovery and restore function. Follow-up appointments will be essential to assess the surgical site and ensure proper healing.

Short Descr CRNEC SOPL CRV LAM DCMPRN
Medium Descr CRNEC SUBOCCIPITAL CRV LAM DCMPRN MEDULLA & CORD
Long Descr Craniectomy, suboccipital with cervical laminectomy for decompression of medulla and spinal cord, with or without dural graft (eg, Arnold-Chiari malformation)
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) 0 - 150% payment adjustment for bilateral procedures does NOT apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 2 - Payment restriction for assistants at surgery does not apply to this procedure...
Co-Surgeons (62) 1 - Co-surgeons could be paid, though supporting documentation is required...
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
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 3 - Laminectomy, excision intervertebral disc

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.
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).
58 Staged or related procedure or service by the same physician or other qualified health care professional during the postoperative period: it may be necessary to indicate that the performance of a procedure or service during the postoperative period was: (a) planned or anticipated (staged); (b) more extensive than the original procedure; or (c) for therapy following a surgical procedure. this circumstance may be reported by adding modifier 58 to the staged or related procedure. note: for treatment of a problem that requires a return to the operating/procedure room (eg, unanticipated clinical condition), see modifier 78.
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.
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.
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.)
79 Unrelated procedure or service by the same physician or other qualified health care professional during the postoperative period: the individual may need to indicate that the performance of a procedure or service during the postoperative period was unrelated to the original procedure. this circumstance may be reported by using modifier 79. (for repeat procedures on the same day, see modifier 76.)
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
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).
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
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
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2025-01-01 Changed Short Description changed.
Pre-1990 Added Code added.
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