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CPT 22634: Lumbar Spinal Arthrodesis, Add-On, Combined Approach
CPT code 22634 denotes an add-on lumbar spinal arthrodesis that permanently fuses two adjoining vertebral bodies using a combined surgical approach. This code captures a complex operative technique intended to stabilize the lumbar spine and reduce progressive pain or neurologic compromise. Nationally, procedures represented by this code are significant due to their association with high-acuity surgical care, use of spinal instrumentation, and implications for hospital resource utilization and postoperative rehabilitation.
Key payers included in this overview are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical and billing context for 22634, comparisons to commonly related spine procedure codes, and a summary of typical sites of service and service type. The publication outlines common clinical indications and associated diagnoses that frequently accompany billing for this procedure and highlights where 22634 fits within the broader spine surgery code set.
This summary equips clinical leaders, coding professionals, and payer policy staff with a clear description of the procedure and its billing role. The content that follows provides benchmarks, coding adjacency to related procedures, and the clinical scenarios in which 22634 is typically reported.
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Billing Code Overview
CPT code 22634 is an add-on spinal arthrodesis procedure used to permanently join two additional adjoining lumbar vertebral bodies. The procedure employs a combination of surgical approaches to access the operative site and achieve fusion, typically performed to prevent further structural damage or persistent pain in the lumbar spine.
Service Type: **Surgical — Spinal fusion, lumbar, combined approach (add-on)"
Typical Site of Service: Inpatient or outpatient hospital surgical suite where complex spine procedures and instrumentation are performed.
National Reimbursement Benchmarks
Medicare's mean rate of $431.30 sits well below BUCA's average commercial mean of $1,303.50, highlighting a substantial gap between federal reimbursement and average commercial payments for CPT 22634. This gulf suggests commercial plans on average reimburse roughly three times Medicare for this procedure, with BUCA representing a higher commercial benchmark versus Medicare's much lower mean.
Dispersion (P75–P25) varies noticeably by payer: Blue Cross Blue Shield shows the widest interquartile spread at $867.10 ($1,953.50 − $1,086.40), indicating substantial variability in commercial contracts, while Aetna is the tightest at $243.00 ($585.10 − $234.10). UnitedHealth Group and Cigna have similar spreads of $534.00 and $516.60 respectively, and BUCA’s spread is $350.60 ($1,511.70 − $816.10). Medicare’s P75–P25 is $39.00 ($446 − $407), demonstrating very low dispersion across localities.