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CPT 64493: Lumbar/Sacral Facet Joint or Medial Branch Injection, Single Level
Headline: CPT code 64493 defines a single-level, unilateral image-guided lumbar or sacral facet joint or medial branch injection. Lead: CPT code 64493 covers the injection of a diagnostic or therapeutic agent into one lumbar or sacral paravertebral facet (zygapophyseal) joint or the nerves supplying that joint using fluoroscopic or CT guidance — a focused interventional pain-management procedure used to diagnose or treat axial low back pain.
CPT code 64493 matters nationally because it is commonly used in interventional pain management and spine care pathways to localize and treat facet-mediated lumbar or sacral pain. Payers evaluated in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, United Healthcare, and Medicare. Readers will find coverage and coding context relevant to outpatient procedural workflows, typical sites of service, and how this code relates to multi-level injections (64494, 64495). The publication summarizes payer coverage scope, common billing considerations, and clinical context for use in diagnostic and therapeutic algorithms for lumbar/sacral facet pain. It also outlines areas where policy updates and utilization management regularly affect access, such as documentation requirements for image guidance and clinical indication for facet procedures.
This report is intended for clinical administrators, coding and billing staff, and policy analysts seeking a concise national overview of coding and coverage considerations for CPT code 64493.
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Billing Code Overview
CPT code 64493 describes the injection of a diagnostic or therapeutic substance into a single lumbar or sacral paravertebral facet (zygapophyseal) joint, or into the nerves that supply that joint, performed with imaging guidance such as fluoroscopy or computed tomography. This service represents treatment or diagnostic targeting of one facet joint level on one side.
Service type: Image-guided lumbar/sacral facet joint or medial branch injection (single level, unilateral).
Typical site of service: Ambulatory surgical center or hospital outpatient department; may also be performed in an office setting equipped for image-guided interventional procedures.
National Reimbursement Benchmarks
Medicare’s mean of $197.6 sits well below BUCA’s commercial average of $588.2, indicating a sizable gap between government and that commercial benchmark for CPT 64493. The difference of $390.6 highlights how reimbursement for this code can vary depending on payer type, with BUCA centered in the upper-mid commercial range while Medicare aligns near the low end of national means.
Examining dispersion via the interquartile spread (P75 minus P25) highlights concentration differences: Blue Cross Blue Shield shows the widest IQR at $802.5 ($1,206.80 − $415.30), reflecting substantial variability among its rates, followed by BUCA at $525.2 ($825.00 − $297.80). The tightest distributions are Aetna at $183.9 ($311.80 − $130.90) and Cigna at $171.6 ($293.80 − $132.20). UnitedHealth Group’s IQR is $182.4 ($342.50 − $160.10), placing it near the lower-dispersion group.