CPT 72133 Lumbar Spine CT Reimbursement | OpenPayer

Summary & Overview

CPT 72133: Lumbar Spine CT Without and With Contrast

CPT code 72133 denotes a lumbar spine CT that includes both non-contrast and contrast-enhanced imaging. This combined approach provides detailed anatomic assessment and improved lesion characterization, making it a commonly used diagnostic tool for trauma, suspected infection, neoplasm, and complex degenerative disease. Nationally, accurate coding for combined-phase CT studies affects claims adjudication, bundling considerations, and resource utilization across outpatient imaging centers and hospital radiology departments.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides a concise reference to insurer coverage patterns, coding benchmarks where available, and clinical context to support appropriate use and documentation.

Readers will find: an explanation of the clinical purpose and typical sites of service for CPT code 72133; common billing considerations and modifiers (listed separately in full resources); and guidance on what documentation elements support the clinical necessity of combined non-contrast and contrast lumbar CT. Data not available in the input is noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 72133lumbar spine CTdiagnostic imagingcomputed tomographyspine imagingradiology codingcontrast-enhanced CToutpatient imaging

Billing Code Overview

CPT code 72133 describes a diagnostic computed tomography (CT) examination of the lumbar spine performed without contrast, followed by additional imaging with contrast. The procedure combines both non-contrast and contrast-enhanced CT imaging to evaluate lumbar spinal anatomy and pathology.

Service type: Diagnostic imaging — CT scan combining non-contrast and contrast phases
Typical site of service: Outpatient imaging center or hospital radiology department

Clinical & Coding Specifications

Clinical Context

A 58-year-old patient presents to the outpatient radiology clinic with progressive low back pain and radicular symptoms to the left lower extremity following a work-related lifting injury. The referring spine surgeon requests a lumbar spine CT with and without contrast to evaluate for suspected neoplasm, infection with epidural extension, complex postoperative changes, or to better characterize an indeterminate lesion seen on prior MRI. The patient registers at the imaging front desk, completes screening for contrast allergies and kidney function; serum creatinine and eGFR are verified per facility protocol. The CT technologist performs a non-contrast lumbar spine CT first to document baseline bone and soft-tissue attenuation. If no contraindication is found, IV access is obtained and iodinated contrast is administered; post-contrast images are then acquired to assess enhancement patterns of lesions, abscesses, or vascular structures. The interpreting radiologist reviews both non-contrast and contrast-enhanced series, documents findings, and issues a final report to the referring provider. Billing is submitted as 72133 for the combined non-contrast and contrast-enhanced lumbar spine CT study, with appropriate modifiers applied as indicated by the site of service, professional component, or unusual circumstances.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component

CPT 72127: CT Cervical Spine, Without and With Contrast

CPT-72083-THORACIC-LUMBAR-SPINE-RADIOGRAPHY-SCOLIOSIS-EVALUATION

CPT 72083: Thoracic and Lumbar Spine Radiography for Scoliosis Evaluation

CPT-72240-CERVICAL-SPINE-MYELOGRAM-IMAGING-SUPERVISION-INTERPRETATION

CPT 72240: Cervical Spine Myelogram Imaging Supervision and Interpretation

CPT-72110-LUMBOSACRAL-SPINE-XRAY-MULTIPLE-VIEWS

CPT 72110: Lumbosacral Spine X‑Ray, Four or More Views

CPT-72142-MRI-CERVICAL-SPINE-WITH-CONTRAST

CPT 72142: MRI Cervical Spine With Contrast

CPT-72158-MRI-LUMBAR-SPINE-WITH-AND-WITHOUT-CONTRAST

CPT 72158: MRI Lumbar Spine, Without and With Contrast

CPT-72084-THORACIC-LUMBAR-SPINE-RADIOGRAPHS-SCOLIOSIS-EVALUATION

CPT 72084: Thoracic and Lumbar Spine Radiographs for Scoliosis Evaluation

CPT-72147-MRI-THORACIC-SPINE-WITH-CONTRAST

CPT 72147: MRI Thoracic Spine With Contrast

CPT-72194-CT-PELVIS-WITH-AND-WITHOUT-CONTRAST

CPT 72194: CT Pelvis With and Without Contrast

CPT-72156-MRI-CERVICAL-SPINE-WITH-AND-WITHOUT-CONTRAST

CPT 72156: MRI Cervical Spine Without and With Contrast

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Taxonomy Code	Specialty	Notes
`2085S0001X`	Diagnostic Radiology	Primary specialty performing and interpreting lumbar spine CTs.
`207L00000X`	Physical Medicine & Rehabilitation	May refer and manage patients with spine disorders; occasionally interpret in some practices.
`2084P0800X`	Neurological Surgery	Referring specialty; interprets imaging for surgical planning.
`2086S0102X`	Orthopedic Surgery — Spine	Referring specialty involved in preoperative imaging and interpretation related to spine pathology.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M54.5`	Low back pain	Common indication for lumbar spine CT to evaluate osseous pathology or complications when MRI is contraindicated.
`M51.26`	Other intervertebral disc displacement, lumbosacral region	CT can help evaluate disc calcification or associated bony changes when MRI is limited.
`M48.06`	Spinal stenosis, lumbar region	CT delineates osseous canal narrowing and facet hypertrophy contributing to stenosis.
`S33.5XXA`	Sprain of ligaments of lumbar spine, initial encounter	Used in trauma contexts; CT assesses fractures or occult bony injury.
`C79.51`	Secondary malignant neoplasm of bone — pelvis and lower limb (use for metastatic disease to lumbar spine)	Contrast-enhanced CT helps evaluate suspicious enhancing lesions and extent of metastatic disease.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`72131`	CT lumbar spine; without contrast material	Often used when only non-contrast imaging is performed; `72133` includes both without and with contrast, so `72131` may be used if contrast is not given.
`72132`	CT lumbar spine; with contrast material(s)	Used when only contrast-enhanced images are obtained; `72133` combines non-contrast and contrast series and supersedes single-phase codes when both phases are performed.
`72141`	CT pelvis; without contrast material	May be performed in the same session when pathology extends into the pelvis or when combined lumbar-pelvis evaluation is indicated.
`70450`	CT head/brain; without contrast	Frequently part of broader trauma imaging protocols — may be performed separately in polytrauma patients.
`73700`	CT lower extremity, any joint; without contrast	May be performed for referred pain or to evaluate related osseous injuries in trauma workflows.

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