CPT (Current Procedural Terminology) codes are five-digit numbers that describe every medical service or procedure. Your doctor, hospital, and insurance company use them to communicate exactly what was done. Every line on your medical bill has a CPT code, and knowing the code lets you look up what Medicare pays for that same service.

Why do providers charge so much more than Medicare pays?

Providers set their own "chargemaster" prices, which are essentially list prices. Medicare pays a fixed rate based on the resources each service actually requires (the RVU system for procedures, or the Clinical Lab Fee Schedule for lab tests). Commercial insurers typically pay 150% to 250% of Medicare rates. Uninsured patients are often billed the full chargemaster price, which can be 2x to 30x what Medicare pays.

Can I use Medicare rates to negotiate my bill?

Yes. Medicare rates are the closest thing to a "fair price" benchmark in U.S. healthcare. When negotiating, ask the provider what they accept from Medicare for the same CPT code. Most providers will accept 150% to 200% of Medicare for cash-pay patients, which is still far less than their chargemaster price. Many hospital financial assistance policies also use a multiple of Medicare as their discount floor.

How are Medicare rates calculated?

For most procedures, Medicare uses the Resource-Based Relative Value Scale (RBRVS). Each CPT code gets three RVU components: Work (physician time and skill), Practice Expense (overhead), and Malpractice. These are multiplied by geographic adjustment factors (GPCIs) and a conversion factor ($33.4009 in 2026). Lab tests (80000-89999 range) use a separate Clinical Laboratory Fee Schedule with flat national rates.

CPT 72148

MRI of Lumbar Spine Without Contrast

CPT 72148 is one of the most commonly ordered imaging studies in the United States, performed over 700,000 times per year on Medicare beneficiaries alone. Providers charge an average of $1,226.47 for this MRI, but Medicare pays only $191.72 in a non-facility (office/imaging center) setting. That is a 6.4x markup. The professional component (radiologist reading) is only about $57, meaning over 90% of the charge is for the facility and technical component. A freestanding imaging center can offer the same scan for $300 to $600, compared to $1,500 to $3,000 at a hospital.

Updated May 2026Source: CMS Physician Fee Schedule

CPT 72148 at a Glance

Average provider charge: $1,226.47
Medicare rate (office/imaging center): $191.72
Medicare rate (hospital, physician only): ~$57.49
Typical markup: 6.4x over Medicare office rate

Freestanding center range: $300 to $600
Hospital range: $1,500 to $3,000
Scan type: MRI without contrast
Beneficiaries (2023): 703,938

How the Medicare Rate Is Calculated

Medicare values every procedure using Relative Value Units (RVUs) across three components, then multiplies by the national conversion factor of $33.4009 (2026). For a lumbar spine MRI, the practice expense component is dramatically different between office and facility settings because the MRI machine, technologists, and space are expensive to operate.

Component	What It Covers	Office (Non-Facility)	Hospital (Facility)
Work RVU	Radiologist interpretation time and skill	1.35	1.35
Practice Expense RVU	MRI machine, technologist, space, supplies	4.19	0.30
Malpractice RVU	Professional liability insurance	0.07	0.07
Total RVU		5.61	1.72
x $33.4009	2026 conversion factor	$191.72	$57.49

Why the facility rate is so much lower: The $57.49 facility rate only covers the radiologist's interpretation. When the MRI is performed at a hospital, the hospital bills a separate technical/facility fee (often $800 to $2,000) on top of the professional fee. At a freestanding imaging center, the $191.72 non-facility rate covers everything: the machine, the technologist, and the radiologist reading.

Medicare Rate by State

Medicare adjusts the national rate based on your location using Geographic Practice Cost Indices (GPCIs). The same lumbar MRI pays differently in each state. Because the practice expense component is so large for imaging, geographic variation is more significant than for office visits.

Medicare Rate by State (2026)

Medicare adjusts payments by location using Geographic Practice Cost Indices (GPCIs). Select your state to see the adjusted rate.

Sample State Rates (Office/Imaging Center Setting)

State	Medicare Pays	Avg. Charge	Markup
Texas (Austin)	$152.57	$1,226.47	8.0x
California (Los Angeles)	$164.58	$1,226.47	7.5x
New York (Manhattan)	$163.72	$1,226.47	7.5x
Florida (Fort Lauderdale)	$155.52	$1,226.47	7.9x
Ohio	$140.30	$1,226.47	8.7x
Mississippi	$133.68	$1,226.47	9.2x
Arkansas	$132.26	$1,226.47	9.3x
Alaska	$186.49	$1,226.47	6.6x

Rates shown are for the non-facility (office/imaging center) setting using 2026 GPCIs and the $33.4009 conversion factor. The average provider charge of $1,226.47 is the 2023 national average from CMS utilization data. Actual charges vary by provider.

What Insured Patients Actually Pay for a Lumbar MRI

If you have health insurance, your insurer has a negotiated rate with the imaging facility, typically 150% to 300% of Medicare for imaging studies. For a lumbar MRI, that negotiated rate is usually $300 to $600 at freestanding centers and $800 to $1,800 at hospitals. What you owe depends on your plan design:

Your Situation	What You Likely Pay	How It Works
Coinsurance plan (deductible met)	$60 to $180	20% of the negotiated rate ($300 to $900)
Copay plan (imaging copay)	$100 to $300	Flat copay for advanced imaging (varies by plan)
High-deductible plan (deductible NOT met)	$300 to $1,800	Full negotiated rate until your deductible is met
Medicare Part B	$38.34	20% of the Medicare-approved amount ($191.72)
Medicaid	$0 to $5	Minimal or no cost-sharing in most states

Key insight: facility choice matters more than anything. Your out-of-pocket cost is calculated as a percentage of the negotiated rate. If the negotiated rate is $400 at a freestanding center versus $1,500 at the hospital, your 20% coinsurance is $80 versus $300 for the exact same scan. Always ask your doctor if a freestanding imaging center is an option.

Should You Use Insurance or Pay Cash for a Lumbar MRI?

This is one procedure where cash-pay pricing at a freestanding center can be dramatically cheaper than going through insurance at a hospital. Many freestanding MRI centers advertise cash prices of $300 to $500 for a lumbar spine MRI. If your insurance would route you to a hospital-based facility where the negotiated rate is $1,200+, your 20% coinsurance alone ($240) approaches the full cash price elsewhere.

When Cash-Pay Wins

Your insurance requires a hospital-based facility (high negotiated rate)
You have not met your deductible and the full negotiated rate exceeds cash price
You can find a freestanding center at $300 to $500 cash
Your plan requires prior authorization and you cannot get it in time

When Using Insurance Wins

You have already met your deductible and owe only coinsurance
You are close to meeting your out-of-pocket maximum
Your plan has a flat imaging copay lower than the cash price
You may need follow-up imaging or surgery (track toward deductible)

Important: If you pay cash, the amount does not count toward your insurance deductible or out-of-pocket maximum. If your back problem might lead to surgery or epidural injections later in the year, using insurance for the MRI (even at a higher price) moves you closer to meeting your deductible threshold. Consider your full-year healthcare outlook.

Common Billing Problems with Lumbar MRI

Hospital facility fee surprise

If your MRI is performed at a hospital-owned imaging center (even one that looks like a standalone office), you may receive two separate bills: one for the radiologist reading ($57) and one for the hospital facility fee ($800 to $2,000). Before scheduling, ask: "Is this facility hospital-based or freestanding?" The answer can mean a $1,000+ difference in your bill.

Ordering an MRI too early for acute back pain

Clinical guidelines from the American College of Physicians recommend against MRI for acute low back pain in the first 6 weeks unless red flags are present (progressive neurological deficit, suspected cancer, infection, or cauda equina syndrome). Some insurers will deny the claim if the MRI is ordered before conservative treatment has been tried. If your MRI is denied, ask your doctor to document failed conservative treatment and resubmit.

Repeat MRI after an open MRI

Open MRI machines (used for claustrophobic patients) produce lower-quality images with lower field strength (typically 0.3T to 0.7T versus 1.5T to 3T for closed MRI). Surgeons and pain management doctors may require a repeat scan on a closed MRI before proceeding with treatment. This means paying for two MRIs instead of one. If your doctor plans to use the images for surgical planning, confirm that a closed (high-field) MRI is ordered from the start.

Billing for the wrong code (72148 vs 72149 vs 72158)

CPT 72148 is without contrast, 72149 is with contrast, and 72158 is without contrast followed by with contrast. The most common first-line scan is 72148 (without contrast). If your bill shows 72158 (both sequences) but you only received one scan without contrast injection, you may have been coded incorrectly. Check whether contrast dye was actually administered. The with-and-without code (72158) costs significantly more.

Related Imaging Codes

Code	Description	Medicare (Office)	Avg. Charge
72148	MRI lumbar spine without contrast	$191.72	$1,226.47
72149	MRI lumbar spine with contrast	$217.84	$1,387.00
72158	MRI lumbar spine without then with contrast	$297.55	$1,820.00
72141	MRI cervical spine without contrast	$191.72	$1,195.00
72020	X-ray of spine (single view)	$22.75	$85.00

Frequently Asked Questions

How much does a lumbar spine MRI cost without insurance?

Without insurance, a lumbar spine MRI (CPT 72148) costs $300 to $3,000 depending on the facility. The national average charge is $1,226.47. Freestanding imaging centers typically charge $300 to $600, while hospital-based facilities charge $1,500 to $3,000 for the same scan. Medicare pays $191.72 for this MRI in a non-facility (office/imaging center) setting.

Why is a lumbar MRI so much cheaper at a freestanding imaging center?

Hospital-based imaging centers add facility fees and overhead charges that freestanding centers do not. The professional component (radiologist reading fee) is only about $57, meaning the facility/technical component accounts for over 90% of the total charge. Freestanding centers have lower overhead, no hospital bureaucracy, and pass those savings to patients. The scan quality is identical when both use 1.5T or 3T magnets.

Do I need an MRI for lower back pain?

In most cases, not immediately. Clinical guidelines from the American College of Physicians recommend against MRI for acute low back pain in the first 6 weeks unless red flags are present. Red flags include progressive neurological deficit (worsening leg weakness or numbness), suspected cancer, infection, or symptoms of cauda equina syndrome (loss of bowel/bladder control). Most acute back pain resolves with conservative treatment. Early MRI findings often show "abnormalities" that are actually normal age-related changes, which can lead to unnecessary interventions.

What is the difference between CPT 72148 and 72149?

CPT 72148 is an MRI of the lumbar spine without contrast, while 72149 is with contrast, and 72158 is without contrast followed by with contrast. The without-contrast version (72148) is the most commonly ordered and is sufficient for most disc herniations and spinal stenosis evaluations. Contrast (gadolinium) is typically added when infection, tumor, or post-surgical scar tissue are suspected. If you are unsure why contrast was ordered, ask your doctor whether the without-contrast version would be sufficient.

Need Help Lowering a Medical Bill?

CareRoute Bill Defense is a done-for-you bill reduction service. We analyze the codes on your bill, identify overcharges and coding errors, and apply negotiation and reduction strategies on your behalf. If you received an MRI bill that seems too high, we can help.

Learn about Bill Defense