Summary & Overview
CPT 22558: Anterior Lumbar Spinal Fusion
CPT code 22558 represents an anterior lumbar arthrodesis (spinal fusion) procedure in which the surgeon accesses the lower spine through an abdominal incision to remove disk material and permanently join two vertebrae. This surgical code matters nationally because spinal fusion procedures are common, resource-intensive interventions with significant implications for hospital resource use, payer coverage policies, and postoperative care pathways.
Key payers examined include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, an overview of where the service is typically delivered, and what coverage considerations payers commonly evaluate for lumbar fusion surgeries. The publication highlights benchmark metrics, utilization patterns, and relevant policy updates affecting authorization, site-of-service determinations, and inpatient versus outpatient payment rules.
The report helps clinicians, coding professionals, and policy analysts understand how CPT code 22558 is used in practice, what factors influence payer decisions, and where stakeholders may focus efforts to align clinical documentation with coverage criteria. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 22558 describes arthrodesis (spinal fusion) of the lower back performed via an anterior approach, in which the provider makes an incision in the abdomen to access the lumbar spine, remove disk material, and permanently join two vertebrae to relieve persistent pain from a herniated or bulging disk or other spinal condition.
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Service type: Surgical procedure — anterior lumbar spinal fusion.
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Typical site of service: Hospital operating room or ambulatory surgical center with inpatient or outpatient postoperative placement determined by clinical need.
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Clinical & Coding Specifications
Clinical Context
A 52-year-old patient with chronic, progressive low back pain and radiculopathy refractory to conservative care (physical therapy, epidural steroid injections, and medications) presents with persistent neurogenic claudication and demonstrable segmental instability on dynamic radiographs and MRI showing degenerative disk disease with focal disk herniation at L4-L5. After multidisciplinary evaluation, the surgeon elects an anterior lumbar interbody fusion (ALIF) at L4-L5 to remove disk material, restore disk height, decompress neural elements, and achieve arthrodesis. The clinical workflow includes preoperative imaging and clearance, informed consent, general anesthesia, a transabdominal or retroperitoneal approach for disk removal and interbody cage placement, intraoperative neuromonitoring as indicated, possible supplementary posterior instrumentation in a staged or single-setting posterior approach, postoperative admission for pain control and mobilization, and follow-up radiographs to assess fusion progression.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work or complexity substantially exceeds typical for 22558 due to extensive dissection, severe adhesions, or unexpected intraoperative findings. |