22612

Arthrodesis, posterior or posterolateral technique, single level; lumbar (with lateral transverse technique, when performed)

CPT code 22612 describes a posterior or posterolateral spinal arthrodesis (fusion) performed at a single level in the lumbar spine. This surgical procedure is designed to permanently join two adjacent vertebrae to eliminate motion that is generating pain or to stabilize an unstable spinal segment. The procedure utilizes a posterior approach, meaning the incision is made in the back directly over the targeted spinal level. It may also incorporate a lateral transverse technique, where the fusion extends out to the transverse processes. The operation begins with meticulous dissection through the paraspinal musculature to expose the posterior spinal elements, including the spinous processes, laminae, facet joints, and transverse processes. Once exposed, the surgeon uses high-speed burrs and specialized instruments to decorticate the bony surfaces. Decortication removes the hard outer cortical bone to expose the vascular, bleeding cancellous bone underneath, which is biologically necessary to stimulate the body's natural bone healing and fusion process. Following the preparation of the host bone bed, bone graft material is placed. This graft material may consist of autograft (bone harvested from the patient, often locally during the procedure or from the iliac crest), allograft (donor bone), synthetic bone substitutes, or a combination thereof. The bone graft serves as a scaffold and biological stimulant for new bone growth. Over a period of months following the surgery, the bone graft will biologically incorporate with the patient's existing bone, creating a solid, continuous mass of bone across the targeted spinal level. This procedure is heavily indicated for patients suffering from mechanical back pain or neurological deficits secondary to lumbar spondylolisthesis, severe degenerative disc disease with associated instability, recurrent disc herniations, or pseudoarthrosis from a previously failed spinal fusion. It is important to note that CPT 22612 solely encompasses the work of the arthrodesis itself. Associated procedures frequently performed during the same operative session, such as spinal instrumentation (the placement of pedicle screws and rods to immediately stabilize the spine while the biological fusion matures), extensive neural decompression (laminectomy, foraminotomy), or the harvesting of structural bone grafts through a separate surgical incision, are not inherently included in 22612 and must be reported using distinct, supplementary CPT codes according to current coding guidelines.

Clinical Indications

  • Lumbar spondylolisthesis (isthmic or degenerative)
  • Degenerative disc disease (DDD) with documented instability
  • Spinal stenosis with dynamic instability
  • Pseudoarthrosis (failed previous spinal fusion)
  • Traumatic lumbar spinal fracture or dislocation requiring stabilization

Procedure Steps

  1. The patient is placed in a prone position under general anesthesia on a specialized radiolucent spinal table.
  2. A midline longitudinal incision is made over the targeted single lumbar spinal level.
  3. Subcutaneous tissues are dissected, and the paraspinal muscles are carefully stripped and retracted laterally to expose the posterior bony elements (spinous processes, laminae, facet joints, and transverse processes).
  4. Fluoroscopy is utilized to confirm the correct operative spinal level.
  5. The posterior and posterolateral bony surfaces, including the facet joints and transverse processes, are meticulously decorticated using high-speed burrs, rongeurs, and curettes to create a bleeding bone bed.
  6. Bone graft material (local autograft, iliac crest autograft, allograft, and/or biologic substitutes) is prepared and packed tightly over the decorticated bony surfaces to promote osteogenesis.
  7. If planned, spinal instrumentation and/or neural decompression are performed at this stage (reported separately).
  8. The surgical site is irrigated, and hemostasis is meticulously achieved.
  9. The fascial layers, subcutaneous tissues, and skin are closed in multiple layers, and a sterile dressing is applied.

Coding Guidelines

  • Code 22612 represents arthrodesis for a single lumbar interspace or level.
  • For each additional lumbar level fused during the same operative session, report add-on CPT code 22614.
  • Do not report 22612 in conjunction with 22630 or 22633 at the same specific interspace unless performed via a distinctly different approach or independent session.
  • Spinal instrumentation (e.g., pedicle screws, rods) is not included in 22612; report appropriate instrumentation codes (e.g., 22840, 22842) separately.
  • Bone graft harvesting through a separate skin or fascial incision (e.g., iliac crest autograft 20936-20938) is reported separately.
  • Therapeutic decompression (e.g., laminectomy, foraminotomy) is reported separately if performed for documented neural compression, but not if performed solely to prepare the fusion site or harvest local bone graft.

Associated ICD-10 Codes