Summary & Overview
CPT 64451: Image-Guided Sacroiliac Joint Nerve Block
CPT code 64451 denotes an image-guided injection of an anesthetic and/or steroid to the nerves supplying the sacroiliac joint for diagnostic and/or therapeutic purposes. This targeted nerve block helps clinicians confirm sacroiliac joint–mediated pain and can provide short- to medium-term symptom relief. Nationally, pain management and spine-intervention services such as this are frequently reviewed by public and private payers because of utilization growth and questions about clinical indications and imaging guidance requirements. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical service represented by the code, payer coverage considerations and common modifiers, and the typical care settings where the procedure is performed. The publication also summarizes benchmarking elements and policy developments relevant to image-guided sacroiliac joint nerve blocks, and provides clinical context useful for coding, billing, and utilization review. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 64451 describes an injection of an anesthetic and/or steroid under imaging guidance into the nerves supplying the sacroiliac joint for diagnosis and/or treatment of sacroiliac joint pain. This procedure is a targeted nerve block performed to confirm the sacroiliac joint as the pain source and/or provide therapeutic relief.
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Service type: Image-guided sacroiliac joint nerve block (diagnostic and/or therapeutic)
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Typical site of service: Ambulatory surgical center, hospital outpatient department, or physician office with imaging capability (fluoroscopy or CT-guided procedures).
Clinical & Coding Specifications
Clinical Context
A 48-year-old patient presents to a pain management clinic with chronic unilateral buttock and lower lumbar pain radiating to the posterior thigh, worsened by prolonged standing and asymmetric gait. Conservative measures including NSAIDs, physical therapy, and activity modification over 6 months produced limited relief. Physical exam demonstrates focal sacroiliac joint tenderness and positive provocation tests. Imaging (lumbar and pelvis radiographs, and a recent pelvic MRI) excludes significant lumbar disc herniation and shows degenerative changes at the sacroiliac joint. The interventional pain specialist schedules a fluoroscopy-guided diagnostic and therapeutic sacroiliac joint lateral branch injection.
On the day of service the patient arrives to an outpatient ambulatory surgery center. The procedure workflow includes pre-procedure consent and timeout, IV access and monitoring, prone positioning, sterile prep and local skin anesthesia, needle placement under live fluoroscopic guidance targeting the lateral branches innervating the sacroiliac joint, and administration of local anesthetic with or without corticosteroid. Observation for recovery follows, with discharge instructions for activity modification and follow-up to assess diagnostic response (temporary anesthesia) or therapeutic benefit (prolonged pain reduction). Billing uses code 64451 for the imaging-guided injection of the nerves supplying the sacroiliac joint.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 |