CPT® Code 72148

Quick Reference

• Code definition: CPT 72148 covers MRI of the lumbar spinal canal and contents performed without contrast material; no gadolinium is administered at any point during the study.
• Key billing rule: MUE = 1; Medicare will not pay more than one unit per beneficiary per date of service. The combined without-and-with contrast protocol is 72158, not 72148 plus 72149.
• Modifier essentials: PC/TC Indicator = 1 applies in all settings. Radiologists billing interpretation only append modifier 26; facilities billing scan performance only append TC. LT and RT modifiers are never appropriate; the lumbar spine is a midline structure with Bilateral Surgery Indicator = 0 [5].
• Documentation must-have: The ordering provider's clinical note must document the specific diagnosis and, when red-flag symptoms are absent, at least 4 to 6 weeks of failed conservative therapy. "Low back pain" without supporting context is the leading denial trigger [6].
• Top confusion point: When both non-contrast and post-contrast sequences are performed in the same session, 72148 is incorrect; 72158 is the only correct code. Billing 72148 and 72149 together on the same claim for the same lumbar spine violates an NCCI Column 1/Column 2 edit and cannot be corrected with a modifier [6].
• Payer alert: No National Coverage Determination exists for lumbar spine MRI; coverage is MAC-specific via Local Coverage Determinations. Frequency limits and covered diagnoses vary by jurisdiction; verify the applicable LCD before billing [4].
• AUC/PAMA: CMS requires Appropriate Use Criteria consultation for advanced diagnostic imaging ordered for Medicare patients under PAMA; as of early 2026, no payment penalties are in effect, but the program remains in an educational/testing phase [8].

When to Use This Code

Clinical Indications

72148 is the correct code when MRI sequences of the lumbar spinal canal and contents are acquired exclusively without contrast material. Per ACR Appropriateness Criteria, the procedure is rated "Usually Appropriate" for [2,3]:

• Lumbar radiculopathy with a neurological deficit or failure of conservative therapy for 4 to 6 weeks or more
• Cauda equina syndrome (emergent indication; imaging should not be delayed)
• Red-flag presentations: prior malignancy, unexplained weight loss, fever or infection risk, IV drug use, significant trauma, bladder or bowel dysfunction, or saddle anesthesia
• Pre-surgical planning for herniated disc, spinal stenosis, or deformity correction

Scope Boundaries

72148 captures the entire lumbar spinal canal and contents in a single non-contrast session. The code does not expand to cover cervical (72141) or thoracic (72146) anatomy; those require separate codes when medically indicated. It does not include any contrast administration; if gadolinium is used at any point during the study, a different code applies.

"Usually Not Appropriate" per ACR: acute low back pain of less than 4 to 6 weeks duration without neurological deficit or red-flag symptoms. Imaging ordered in this window is a predictable denial risk under most MAC LCDs [2].

Provider and Setting Context

The code is billed globally when a single entity both owns the equipment and provides the professional interpretation (common in independent imaging centers). In hospital outpatient settings, the professional and technical components are split. Physician supervision is listed as "09 - Concept does not apply," consistent with diagnostic radiology services where direct supervision of image acquisition is not a CMS requirement for radiologist billing.

Code Differentiation Table

The critical differentiator is contrast status as confirmed in the radiology report's technique section, not the ordering provider's intent. Always verify the technique section before assigning a code; orders that specify "without contrast" but reports that document gadolinium administration require coding 72158 or 72149 based on actual sequences performed [1].

flowchart TD
    A[Lumbar spine MRI ordered] --> B{Contrast administered?}
    B -- No --> C[72148: without contrast]
    B -- Yes: contrast only, no prior non-contrast sequences --> D[72149: with contrast only]
    B -- Yes: non-contrast sequences followed by contrast sequences --> E[72158: without and with contrast]
    C --> F{Same session includes cervical or thoracic MRI?}
    F -- Yes --> G[Bill 72141 and/or 72146 separately — distinct anatomic sites, not bundled]
    F -- No --> H[72148 stands alone]

Billing and Modifier Rules

PC/TC Split

72148 carries PC/TC Indicator 1 (Diagnostic Tests for Radiology Services), making the professional and technical components separately billable [5,7]:

• 72148-26: Radiologist billing interpretation only; the imaging equipment is owned by a hospital, facility, or another entity
• 72148-TC: Facility or equipment owner billing the technical component only; professional interpretation provided by a separate entity
• Global (no modifier): Single entity owns the equipment and provides the interpretation; common in independent imaging centers

Modifiers That Apply

Modifiers That Do Not Apply

LT, RT, and modifier 50 are never appropriate. The lumbar spine is a midline unpaired structure; CMS Bilateral Surgery Indicator = 0. Appending LT or RT causes claim rejection [5].

MUE and Units

MUE = 1. Medicare will not reimburse more than one unit of 72148 per beneficiary per date of service. A repeat study on the same calendar day requires documentation of unusual clinical circumstances.

Multiple Imaging TC Reduction

When 72148-TC is billed on the same date as other diagnostic imaging technical components, CMS applies special payment adjustment rules (Multiple Procedure Indicator = 4). The TC of the lower-valued imaging service is reduced by 50 percent. The professional component (modifier 26) is not subject to this reduction [6].

Add-On Codes

Two quantitative MRI add-on codes may be reported in addition to 72148 when quantitative tissue composition analysis is performed:

• 0649T: Single organ quantitative MRI analysis (list separately in addition to primary code)
• 0698T: Multiple organ quantitative MRI analysis (list separately in addition to primary code)

Per CPT guidelines, do not report 0697T or 0648T in conjunction with 72148 when evaluating the same organ, gland, tissue, or target structure [1].

NCCI Bundling

• 72148 + 72149 (same date, lumbar spine): Column 1/Column 2 PTP edit; mutually exclusive. No modifier override is appropriate. Use 72158 when both phases are performed [6].
• 72148 + 72158 (same date, lumbar spine): 72158 is comprehensive; it bundles 72148. Cannot bill both.
• 72148 + 72141 or 72146 (same date): Not bundled. Cervical and thoracic spine are distinct anatomic regions payable separately when medically necessary with independent documentation.

Documentation Essentials

Required Elements

The medical record must contain all of the following to support 72148 [6,7]:

1. Written or electronic order from the ordering provider with the clinical indication stated
2. Clinical note documenting the specific diagnosis including relevant signs, symptoms, and history; the diagnosis code billed must be supported by narrative in the provider's record
3. Conservative therapy documentation: for non-emergent indications, evidence that conservative management (NSAIDs, physical therapy, chiropractic care) was attempted for 4 to 6 weeks or more, unless a red-flag indication is present
4. Radiologist's report containing: clinical indication, imaging technique (field strength, sequences, scan planes), structured findings per lumbar vertebral level (disc signal and height, canal diameter, foraminal stenosis, nerve root involvement, conus signal), and clinical impression
5. Red-flag documentation when used to justify imaging before the conservative therapy threshold: explicit mention of the specific red-flag symptom or diagnosis in the ordering provider's note

Audit Red Flags

OIG and MAC auditors flag 72148 claims for the following patterns [9]:

• Diagnosis code M54.50 (low back pain, unspecified) without supporting clinical context demonstrating medical necessity; this code alone consistently triggers denials and is a primary audit target
• Absence of any reference to conservative therapy duration when no red-flag indication is documented
• Missing or unsigned ordering provider order
• Radiology report lacking structured level-by-level findings; generic impressions without technique documentation
• Contrast code discrepancy between the order and the technique section of the report

Medicare, Commercial and Medicaid Payer Rules

Medicare

There is no National Coverage Determination for lumbar spine MRI. Coverage is governed by MAC-level Local Coverage Determinations, with active LCDs maintained by Noridian, Novitas, CGS, WPS, Palmetto GBA, NGS, and First Coast. Each LCD specifies covered ICD-10-CM codes and documentation thresholds. Verify the applicable LCD in your jurisdiction via the CMS Medicare Coverage Database [4].

Frequency limitations apply under most MAC LCDs: commonly 1 to 2 lumbar spine MRI studies per rolling 12-month period, with exceptions for documented clinical change or post-surgical follow-up. Exceeding frequency limits without documented clinical justification results in automatic denial.

72148 is included in Diagnostic Imaging Family 88 and BETOS category I2D (Advanced imaging, MRI/MRA: other). The APC Status Indicator indicates the code may be paid through a Composite APC in the hospital outpatient setting. ASC payment is based on MPFS nonfacility PE RVUs when the service is provided integral to a surgical procedure on the ASC list [5].

Global Days = XXX (concept does not apply); there is no surgical global period associated with this diagnostic radiology service.

The PAMA Appropriate Use Criteria consultation requirement applies to advanced diagnostic imaging ordered for Medicare patients; as of early 2026, CMS is conducting educational and operations testing with no payment penalties in effect. Monitor CMS for enforcement updates [8].

Commercial Payers

Commercial payers broadly follow Medicare coverage logic for 72148 but frequently add prior authorization requirements for non-emergent lumbar spine MRI. Authorization policies vary by payer and plan; obtain authorization before scheduling when required to prevent post-service denials. Some commercial plans impose stricter conservative therapy thresholds or require specific ICD-10-CM codes beyond what MAC LCDs require; verify payer-specific policies for high-volume commercial contracts.

Common Denials and Prevention

Wrong contrast code selected Billing 72148 when the radiology report documents gadolinium administration. Root cause: coding from the order rather than verifying the technique section of the completed report. Prevention: Establish a workflow requiring coders to confirm contrast status in the radiologist's report before selecting 72148 vs. 72149 vs. 72158. The report technique section is the authoritative source [1].

Medical necessity: insufficient documentation Claim denied because M54.50 (low back pain, unspecified) was billed without supporting clinical detail, or conservative therapy documentation is absent. Root cause: ordering provider documents a symptom code without clinical context or fails to document trial of conservative management. Prevention: Communicate to ordering providers that MAC LCDs require specific ICD-10-CM codes supported by clinical narrative and, for non-emergent studies, documented conservative therapy of 4 to 6 weeks minimum. Consider a pre-authorization checklist that includes these elements [4,6].

Frequency exceeded Claim denied because a previous lumbar spine MRI was performed within the MAC LCD frequency window without documented clinical change. Prevention: Query the payer or EHR for prior lumbar MRI dates before scheduling. When a second study within the frequency window is clinically warranted, obtain documentation of new or worsening symptoms and include this in the record [4].

NCCI bundle: 72148 + 72149 billed together Both codes submitted for the same lumbar spine on the same date; payer bundles and denies the lower-valued code. Prevention: The combined study must be coded as 72158 at the point of code selection. This edit cannot be correctly overridden with modifier 59; the only fix is accurate coding from the start [6].

LT or RT modifier causes rejection Claim rejected because a laterality modifier was appended. Root cause: encoder default or biller error applying laterality modifiers to a midline imaging code. Prevention: Confirm Bilateral Surgery Indicator = 0 for 72148 and configure encoder rules to flag laterality modifiers on this code as an error [5].

Coding Scenarios

Scenario 1: Classic radiculopathy, independent imaging center A 58-year-old presents with 6 weeks of low back pain radiating into the left leg with L5 distribution paresthesias and decreased sensation. The ordering provider documents L5 radiculopathy and 6 weeks of failed conservative therapy (NSAIDs and physical therapy). Non-contrast lumbar MRI is performed and interpreted by a radiologist employed by the imaging center that owns the scanner.

Correct coding: 72148 (global, no modifier) + M51.16

Why: Non-contrast sequences only; the single entity owns the equipment and provides the interpretation, so global billing applies. M51.16 (intervertebral disc disorders with radiculopathy, lumbar region) directly supports medical necessity; M54.50 alone would not.

Scenario 2: Hospital outpatient MRI, PC/TC split Same clinical presentation as Scenario 1, but the MRI is performed at a hospital-owned outpatient facility. Interpretation is provided by an independent radiology group.

Correct coding: Radiology group bills 72148-26; hospital bills 72148-TC. Both claims use M51.16.

Why: The hospital owns the equipment (TC) and the radiology group provides the professional interpretation (26). Billing global by either entity would misrepresent the billing relationship [7].

Scenario 3: Post-surgical evaluation requiring contrast A patient with prior L4-L5 discectomy presents with new left leg pain. The ordering provider documents concern for recurrent disc herniation versus epidural fibrosis. The radiologist performs non-contrast sequences followed by gadolinium contrast sequences in the same session.

Correct coding: 72158 (not 72148)

Why: Both non-contrast and post-contrast sequences were acquired in the same session; 72158 is the correct comprehensive code. Billing 72148 alone would misrepresent the study performed and constitutes undercoding; billing 72148 + 72149 violates an NCCI edit [6].

Scenario 4: Acute low back pain, 2 weeks, no red flags A 35-year-old presents with 2 weeks of low back pain after lifting. Neurological exam is normal, no red-flag symptoms are present. Provider orders lumbar MRI.

Correct coding: High denial risk; do not bill 72148 until documentation meets LCD threshold.

Why: Two weeks of symptom duration is below the 4 to 6 week conservative therapy threshold required by most MAC LCDs for non-red-flag presentations. M54.50 alone is insufficient for Medicare medical necessity. The correct course is to defer imaging until conservative therapy documentation supports it, or to document a specific red-flag indication if one is present [4].

Related Codes

• 72149 (CPT): MRI lumbar spinal canal; with contrast only. Contrast-only alternative; rarely ordered standalone.
• 72158 (CPT): MRI lumbar spinal canal; without and with contrast. Required when both phases are performed in the same session.
• 72141 (CPT): MRI cervical spinal canal; without contrast. Cervical equivalent; separately billable same day.
• 72142 (CPT): MRI cervical spinal canal; with contrast. Cervical with-contrast equivalent.
• 72146 (CPT): MRI thoracic spinal canal; without contrast. Thoracic equivalent; separately billable same day.
• 72156 (CPT): MRI cervical spinal canal; without and with contrast. Cervical combined-protocol equivalent.
• 0649T (CPT): Quantitative MRI tissue composition analysis, single organ. Add-on to 72148 when performed.
• 0698T (CPT): Quantitative MRI tissue composition analysis, multiple organs. Add-on to 72148 when performed.

Sources {#sources}

1. CPT Code Set, Radiology Section (72100-72295) — AMA CPT codebook (2025/2026): code descriptions, guideline notes, add-on code relationships
2. ACR Appropriateness Criteria: Low Back Pain — American College of Radiology: clinical appropriateness ratings for lumbar MRI indications
3. ACR Appropriateness Criteria: Lumbar Radiculopathy — American College of Radiology: imaging appropriateness for radiculopathy workup
4. CMS Medicare Coverage Database: LCD Search — CMS: MAC-level LCDs defining covered diagnoses and documentation requirements for lumbar spine MRI
5. CMS Physician Fee Schedule Lookup Tool — CMS: 2026 RVU values, PC/TC indicator, bilateral indicator, MUE, and status indicators for 72148
6. CMS NCCI Policy Manual for Medicare Services — CMS: PTP edit pairs, MUE rationale, bundling rules, Multiple Procedure Indicator guidance
7. CMS Claims Processing Manual, Chapter 13: Radiology Services — CMS: PC/TC billing rules, supervision requirements for diagnostic radiology
8. CMS PAMA Appropriate Use Criteria Program — CMS: AUC consultation requirements and current program enforcement status
9. HHS OIG Work Plan: Advanced Imaging — HHS OIG: audit priorities and compliance focus areas for high-volume imaging services