What are the most common CT Abdomen billing surprises?

The most common: (1) an out-of-network provider at an in-network facility, (2) multiple bills from different providers for one procedure, (3) prior authorization issues, and (4) facility fee differences between hospital and freestanding settings.

What is the No Surprises Act and how does it protect me?

The No Surprises Act (effective Jan 1, 2022) bans balance billing from out-of-network providers at in-network facilities and from out-of-network emergency providers. Your cost sharing is capped at what you'd owe in-network. You cannot be sent a balance bill - dispute any attempt immediately.

What should I do if I get a bill I didn't expect?

First, request an itemized bill. Then compare the CPT codes to what your physician ordered. Check your Explanation of Benefits (EOB) to see how your insurer processed each line. If there's a discrepancy, dispute with your insurer (not the provider) in writing.

How do I read my EOB to find billing errors?

Check: (1) CPT codes match the procedure ordered, (2) the provider is processed as in-network if they should be, (3) the allowed amount matches what you were quoted, (4) deductible and coinsurance applied correctly, (5) Member Responsibility column equals only what you should owe.

Diagnostic Imaging

John Caruso, FSA, MAAA • June 26, 2026 • 7 min read

The biggest CT Abdomen billing surprises involve separate bills from multiple providers, prior authorization gaps, and out-of-network providers at in-network facilities.

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CT Abdomen Billing Surprises: What Patients Don't Expect (2026)

The biggest CT Abdomen billing surprises happen before the scan: a missing prior authorization, an out-of-network radiologist, or a surprise facility fee from choosing a hospital over a freestanding imaging center. Here's what to watch for and what to do.

The Most Common CT Abdomen Billing Problems

Surprise	Why it happens	What to do
Prior auth denial - full bill	No authorization obtained before scan	Always get auth from your physician first; appeal with clinical notes
Two bills instead of one	Technical (facility) and professional (radiologist) are separate	Check EOB - both claims must be in-network
Radiologist is out-of-network	Radiology groups contract independently of facilities	Confirm the radiology group network status before the scan; NSA protects you at in-network facilities
Hospital facility fee vs. imaging center	Hospital outpatient departments charge 1.5–2.5× more	Request the scan at a freestanding imaging center when safe to do so
Contrast billed separately	With-contrast scan = higher CPT code with additional charge	Ask your ordering physician whether contrast is required; confirm coverage
Follow-up imaging triggered	Incidental finding on primary scan → second scan ordered	Each follow-up study is a new claim with new cost sharing
Wrong CPT code	Facility bills the wrong scan type	Review itemized bill; compare CPT code to the physician's order

Prior Authorization: The #1 Preventable Error

Missing prior authorization for CT Abdomen is the single most expensive billing error - the entire claim can be denied, leaving you responsible for $500–$5,000+.

What to do before your scan:

Confirm your ordering physician submitted a PA request and received an approval number
Ask for the authorization number and expiration date in writing
Verify the authorization covers the SPECIFIC scan ordered (with vs. without contrast, specific body part)
Check that the authorization covers the specific facility where the scan will be performed

The Two-Bill Problem

A single CT Abdomen routinely generates two separate claims:

Technical component: The imaging center or hospital bills for equipment, staff, and overhead
Professional component: A radiologist (often from a separate group) bills for reading the scan

Both claims go to your insurance, but they may have different:

Network status (you can get a bill from an OON radiologist at an in-network facility)
Allowed amounts
Processing timelines (may arrive weeks apart)

Under the No Surprises Act: If the facility is in-network and the radiologist is out-of-network, you are protected from balance billing - the radiologist's cost sharing cannot exceed what you'd owe in-network.

Reading Your EOB

When your Explanation of Benefits arrives, verify:

The CPT code(s) match the scan your physician ordered
Both technical and professional components are listed
Both are processed at in-network rates
The allowed amount, not the billed amount, is the basis for cost sharing

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About the Author

John Caruso, FSA, MAAA

Healthcare actuary with 20+ years of experience in insurance pricing, medical billing systems, and healthcare cost analytics.

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