CPT Code 74177: A 2026 Guide to Billing CT Abdomen and Pelvis With Contrast

What Is CPT Code 74177?

CPT 74177 is the billing code for a computed tomography scan of the abdomen and pelvis performed with intravenous contrast material, reported as one combined study rather than as separate abdomen and pelvis scans. The code exists so that when a CT covers both anatomic regions in the same session, the study is billed once under a single combined code. Claims require a component modifier (26 for the professional interpretation or TC for the technical component) unless one entity provides both, and NCCI edits prohibit billing separate abdomen and pelvis CT codes alongside 74177 for the same session.

• It is a combined study code. 74177 captures both the abdomen and pelvis in one code. Billing them separately is unbundling.
• Modifier 26 or TC is required when components split. Without the correct component modifier, the claim rejects because the payer cannot determine which service is being billed.
• Contrast determines the code. 74176 is without contrast, 74177 is with contrast, and 74178 is without followed by with contrast.

What CPT Code 74177 Covers

CPT 74177 describes a CT scan of the abdomen and pelvis performed with contrast material, reported as a single combined study. The code was created specifically to prevent the practice of billing a separate abdomen CT and a separate pelvis CT when both regions are scanned in the same session. Before the combined codes existed, facilities routinely billed two separate codes for what was effectively one continuous scan, which inflated reimbursement beyond what the single study warranted.

The “with contrast” designation is built into the code definition. Contrast material, typically an iodine-based intravenous agent, is administered before or during the scan to enhance visualization of blood vessels, organs, and soft tissue structures. The radiologist’s report must document that contrast was administered, the type of contrast used, and the clinical findings. If the study is done without contrast, the correct code is 74176. If the study includes both a non-contrast and a contrast phase, the correct code is 74178.

The clinical indications for 74177 are broad. Common uses include evaluation of abdominal and pelvic masses, staging of known malignancies, assessment of abdominal pain with suspected pathology, evaluation of liver lesions, renal masses, lymphadenopathy, and vascular abnormalities. The ACR Appropriateness Criteria provide clinical decision support for when contrast-enhanced CT of the abdomen and pelvis is the appropriate study, and referencing these criteria in the order documentation strengthens the medical necessity argument on the claim.

74176 vs 74177 vs 74178: The Contrast Variants

The three combined abdomen-and-pelvis CT codes are separated entirely by contrast administration. The clinical content and the anatomic regions covered are the same. The only variable is whether contrast was given and in what sequence.

Choosing the wrong contrast variant is one of the most frequent denial reasons on combined CT studies. The code must match what the radiologist’s report documents. If the report describes a contrast-enhanced study but the claim carries the without-contrast code, the payer will deny for a code-to-documentation mismatch. The billing team should verify the contrast status on the report before selecting the code, not assume it based on the order.

One question we hear constantly from radiology practice managers is whether to default to 74178 (the dual-phase code) because it reimburses the highest. That approach invites audit risk. 74178 is appropriate only when both a non-contrast and a contrast phase are performed as part of a defined clinical protocol. Billing 74178 when only a single contrast phase was performed is overcoding and will not survive a medical record review.

The Component Modifier Requirement

Like all imaging services, 74177 splits into two components. The professional component (modifier 26) covers the radiologist’s interpretation and report. The technical component (modifier TC) covers the equipment, technologist, and facility resources used to perform the scan. When the interpreting radiologist and the facility that performed the scan are separate billing entities, each bills its own component with the appropriate modifier. When one entity provides both, the global service is billed without a modifier.

In many billing settings, a claim submitted without either modifier 26 or TC, where the split applies, is rejected outright. The payer cannot determine which component is being billed, so it returns the claim for correction. This is especially visible on 74177 because of the code’s high volume. Across the billing companies we vet for radiology practices, the ones that handle component billing well build automated rules into their practice management systems that flag any imaging claim submitted without a modifier when the billing entity is not set up for global billing. That single automation prevents one of the highest-volume rejection categories in radiology.

The component split also affects reimbursement modeling. The professional component for 74177 typically reimburses at roughly 15 to 25 percent of the global rate, while the technical component captures the remaining 75 to 85 percent. For radiology groups that provide only the interpretation, understanding this split is essential for accurate revenue projections. For facilities that own the equipment and employ the radiologists, global billing captures both components in one claim.

NCCI Bundling: Why You Cannot Unbundle

When an abdomen-and-pelvis CT is performed in the same session, the combined code is the only correct way to report it. National Correct Coding Initiative edits specifically prohibit billing a standalone abdomen CT (such as 74160 or 74170) alongside a standalone pelvis CT (such as 72192 or 72193) for the same encounter when the combined code applies. Splitting the combined study into its separate anatomic parts to increase reimbursement is unbundling, and it will be denied on submission or recouped after payment.

A CT of a different body region, such as a chest CT (71250) or a chest CT with contrast (71260), is a separate study and can be billed alongside 74177 with documentation supporting the medical necessity for each study. The chest is not part of the combined abdomen-and-pelvis code, so billing both does not trigger NCCI bundling edits as long as each study has its own documented clinical indication.

The practical question that comes up most often involves CT chest-abdomen-pelvis protocols, where the scanner runs continuously from the chest through the pelvis in a single acquisition. Even in that scenario, the billing must reflect the individual code sets: one code for the chest CT and one combined code for the abdomen-and-pelvis CT. The clinical documentation must support the medical necessity for imaging each region separately. If only one clinical indication covers all three regions, a reviewer may question whether two codes are warranted.

Why 74177 Gets Denied

The leading denial reasons for 74177 are procedural, not clinical. They are preventable with the right billing workflow.

• Missing component modifier. Submitting 74177 without modifier 26 or TC when the professional and technical components are billed by separate entities is the single most common rejection. The fix is a system rule that prevents submission without a modifier when the billing entity is not configured for global billing.
• Wrong contrast variant. Billing 74177 (with contrast) when the report documents a non-contrast study, or billing 74176 when contrast was used. The fix is verifying the contrast status on the final report before code selection.
• Unbundling. Billing separate abdomen and pelvis CT codes instead of the combined code for a study that covered both regions in one session. NCCI edits catch this automatically, and the claim is denied or recouped.
• Diagnosis does not support medical necessity. The ICD-10 code on the claim does not establish a clinical reason for a contrast-enhanced CT of the abdomen and pelvis. Common supporting diagnoses include abdominal pain (R10 series), known malignancy, suspected mass, infection, or vascular pathology. A diagnosis of routine screening without additional clinical context may not meet the medical necessity threshold.

In our experience matching radiology practices with billing companies that specialize in imaging, the practices with the lowest 74177 denial rates are the ones whose billing teams verify contrast status, confirm the modifier, and check medical necessity before submitting every claim. That three-step check takes seconds per claim and prevents the majority of avoidable denials on this code.

Frequently Asked Questions

Next Steps

If your radiology practice bills 74177 at high volume, verify that your billing workflow includes a contrast verification step, an automatic modifier check, and an NCCI edit review before every claim goes out. Those three steps prevent the majority of avoidable denials on this code.

For practices that need a billing partner with radiology-specific experience in combined CT coding, component billing, and NCCI compliance, Radiology Bill Co connects you with vetted billing companies that specialize in diagnostic imaging reimbursement across all practice settings.