What Is CPT Code 74176?
CPT code 74176 reports a computed tomography study of the abdomen and pelvis performed without contrast material. It is a single combined code covering both body regions in one session, which means the abdomen and the pelvis are not reported separately when both are imaged during the same encounter. The code sits alongside 74177 and 74178 in a three-code family separated entirely by contrast protocol, and choosing between them is the first decision a coder makes on every CT abdomen and pelvis claim.
- No contrast, at all: 74176 applies only when no contrast material is administered. If contrast is given at any point in the study, the correct code is 74177 or 74178 depending on the protocol.
- One code for two regions: When both the abdomen and the pelvis are imaged in the same session, 74176 replaces separate abdomen-only and pelvis-only CT codes. Billing the two regions separately for one combined study is unbundling.
- Component split applies: Like other diagnostic imaging codes, 74176 can be billed globally, or split into a professional component with modifier 26 and a technical component with modifier TC when the interpreting physician and the equipment owner are different entities.
What CPT 74176 Covers
74176 describes the acquisition and interpretation of cross-sectional images of the abdomen and pelvis without the administration of intravenous, oral, or rectal contrast material. The study evaluates the solid organs, the bowel, the retroperitoneum, the urinary tract, and the pelvic structures in a single acquisition. Because no contrast is used, the study is well suited to questions where density differences alone answer the clinical question, and poorly suited to questions that depend on vascular or parenchymal enhancement.
The report must make the contrast status explicit. A dictation that describes the technique as “CT of the abdomen and pelvis” without stating whether contrast was administered leaves the coder guessing, and a guess is what produces the denial. The single most useful documentation habit for this code family is a technique line at the top of every report that names the regions imaged and the contrast protocol used.
Across the billing companies we vet for radiology practices, the operators who keep this code clean are the ones who treat the technique line as a billing field rather than a clinical formality. The weaker operators code from the order, and the order frequently says something different from what was actually performed. When a patient’s renal function comes back borderline and the protocol is switched to noncontrast at the scanner, the order still reads “with contrast” and the claim goes out wrong unless someone reads the report.
74176 vs 74177 vs 74178: Choosing by Contrast Protocol
The three combined abdomen and pelvis CT codes are distinguished by one variable: what contrast was given and when. Nothing else separates them. The regions imaged are identical, the anatomy is identical, and the interpretation work is broadly comparable. Only the contrast protocol changes the code.
| Code | Contrast protocol | The report must document | Common clinical driver |
| 74176 | No contrast administered | Noncontrast technique, both regions imaged | Suspected urinary stone, known calcification, contrast contraindication |
| 74177 | Contrast administered | Contrast agent and route, both regions imaged | Mass, abscess, staging, vascular or inflammatory evaluation |
| 74178 | Noncontrast followed by contrast | Both phases performed and interpreted | Lesion characterisation requiring pre and post comparison |
Only one of the three is reported per session. They are mutually exclusive by construction, and billing 74176 alongside 74177 or 74178 for the same encounter will trigger a bundling edit. If a noncontrast series is acquired and contrast is then administered for a second series, that is a single 74178 study, not a 74176 plus a 74177. For the contrast-enhanced side of the family, our CPT 74177 billing guide covers the same ground from the with-contrast perspective.
When Is 74176 the Right Code?
Noncontrast CT of the abdomen and pelvis is ordered when contrast would add nothing to the diagnostic question, or when contrast cannot safely be given. These are the scenarios where 74176 is routinely the correct code.
- Suspected urinary tract stone: The classic noncontrast indication. Stones are dense enough to be seen without enhancement, and contrast can actually obscure them once it reaches the collecting system.
- Known calcification or stone follow-up: Surveillance of a previously identified stone or calcified lesion, where the question is size and position rather than tissue character.
- Contrast contraindication: Impaired renal function, a documented contrast reaction, or another clinical reason contrast was withheld. Document the reason, because it also supports medical necessity for the noncontrast protocol.
- Acute abdominal or flank pain where stone is the leading question: Often the first-line study before any decision about contrast-enhanced imaging.
- Follow-up of a finding that does not require enhancement: Interval assessment where the prior study established the diagnosis and the current question is purely anatomic.
The diagnosis code on the claim has to match that reasoning. A noncontrast study ordered for flank pain and paired with an ICD-10 code for suspected urinary calculus tells a coherent story. The same study paired with a vague, unspecified abdominal pain code invites a medical necessity review, because the payer cannot see why contrast was omitted. Local Coverage Determinations vary between Medicare Administrative Contractors, so confirm the indication list your MAC publishes rather than assuming a national rule. The ACR appropriateness criteria remain the clinical reference that supports the choice of protocol.
Contrast-protocol coding errors are quiet revenue leaks. A study switched to noncontrast at the scanner, billed from the original order, denies or gets recouped months later. A radiology billing partner that codes from the report rather than the order catches it before submission. Get matched with vetted radiology billing companies at no cost.
Modifiers and Component Billing for 74176
Which modifier belongs on a 74176 claim depends on who owns the scanner and who wrote the report. The code itself does not change, only the portion of the service being billed.
Modifier 26 (Professional Component)
Appended when the radiologist bills only for interpreting the study and producing the signed report, and a separate entity owns the equipment. This is the standard arrangement for hospital-based and teleradiology reads. The professional component covers the physician work and nothing else. Our modifier 26 billing guide works through the professional and technical split in detail, including the place-of-service rules that catch practices out.
Modifier TC (Technical Component)
Billed by the facility that owns the scanner, employs the technologist, and carries the overhead. Hospitals, outpatient imaging centres, and independent diagnostic testing facilities bill TC for their portion. The technical component is the larger share of the total payment on CT studies, because it absorbs the equipment and staffing cost.
Global Billing (No Modifier)
When one entity owns the scanner and employs the interpreting physician, the study is billed globally with no component modifier. Freestanding imaging centres with employed radiologists fall here. Billing a component modifier when the global service applies, or billing globally when only the read was provided, both produce recoupable payment errors.
| What was provided | Modifier | Who bills it |
| Interpretation and report only | 26 | Interpreting physician or radiology group |
| Equipment, technologist, and overhead only | TC | Facility that owns the scanner |
| Both components by one entity | None (global) | The single owning practice |
A radiologist who reads for a hospital on some days and at an owned office on others needs a different billing configuration for each site. In our experience matching providers with billing partners, this per-site mapping is the control that prevents component errors, and it is the one most in-house teams never formally document.
What Does CPT 74176 Reimburse?
Medicare pays 74176 from the Physician Fee Schedule, calculated as total relative value units multiplied by the annual conversion factor and adjusted for your locality through the Geographic Practice Cost Index. Because both the conversion factor and the RVU assignments are revised every January, any specific dollar figure has a shelf life of one year. Verify the current rate against the published fee schedule for your locality and place of service rather than working from a remembered number.
Three structural points hold regardless of the year. The noncontrast study pays less than its contrast-enhanced counterparts, reflecting the shorter protocol and the absence of contrast cost. The technical component is the larger share of the global payment. And commercial payers typically reimburse above the Medicare allowable, though contracted rates vary widely enough that a single practice can see meaningfully different payments for the same code across its payer mix.
One change worth tracking closely: noncontrast CT is explicitly named in the CMS site-neutral payment proposal for off-campus hospital outpatient departments. Practices billing 74176 through an off-campus department face a materially different technical payment if that policy finalises. Our breakdown of the 2027 site-neutral imaging payment proposal covers which settings are affected and which are exempt.
Why 74176 Claims Get Denied
Denials on this code cluster around a small number of causes, and nearly all of them are documentation or setup problems rather than clinical ones. Each repeats on every claim until the underlying process is corrected.
- Contrast status not documented: The report does not state whether contrast was administered, so the payer cannot confirm that the noncontrast code is correct. This is the leading cause of downcodes and requests for records on the CT abdomen and pelvis family.
- Coded from the order rather than the report: The order specified contrast, the protocol was changed at the scanner, and nobody reconciled the claim against what was actually performed.
- Unbundling the two regions: Separate abdomen-only and pelvis-only CT codes billed for a single combined study. The combined code exists precisely to cover both regions in one session.
- Reporting more than one code from the family: 74176 submitted alongside 74177 or 74178 for the same encounter. Only one applies per session, and the edit is automatic.
- Diagnosis does not support a noncontrast study: A vague or unspecified diagnosis code that gives the payer no reason why contrast was omitted. Pair the claim with an indication that makes the protocol choice obvious.
- Component modifier missing or wrong: Global billed where only the interpretation was provided, or a component modifier applied where the practice owns everything. Both are recoverable by the payer on audit.
Providers often come to us after a run of CT denials they cannot explain, and the root cause is almost always one of the first two items above. Both are caught by the same control: read the technique line in the report before the claim goes out. A billing partner with radiology depth builds that check into the scrub, which converts a recurring denial into a one-time fix.
Frequently Asked Questions
CPT 74176 reports a computed tomography study of the abdomen and pelvis performed without contrast material. It is a single combined code covering both regions in one session, so the abdomen and pelvis are not billed separately when both are imaged during the same encounter.
Contrast. CPT 74176 is the study performed without contrast material, and 74177 is the same study performed with contrast. The regions imaged are identical; only the contrast protocol distinguishes the codes. A study performed without contrast and then repeated with contrast is 74178.
No. Only one code from the combined abdomen and pelvis CT family applies per session, and reporting two of them for the same encounter triggers a bundling edit. If a noncontrast series was acquired and contrast was then administered for a second series, that single study is reported as 74178.
Not when both regions are imaged in the same session. The combined code exists to cover the abdomen and pelvis together, and reporting separate region-specific codes for one combined study is unbundling. Separate codes apply only when a single region is genuinely imaged on its own.
Modifier 26 when billing only the interpretation and report, modifier TC when billing only the equipment and technical work, and no modifier when a single entity provides both. The correct choice depends on who owns the scanner and who wrote the report for that specific encounter.
Most commonly for suspected urinary tract stones, follow-up of a known stone or calcification, and any case where contrast is contraindicated because of impaired renal function or a documented contrast reaction. Contrast can obscure stones once it reaches the collecting system, so the noncontrast protocol is often the better study rather than a compromise.
The most frequent causes are a report that does not state the contrast status, a claim coded from the order after the protocol was changed at the scanner, unbundling the abdomen and pelvis into separate codes, reporting more than one code from the 74176 to 74178 family for the same session, a diagnosis that does not support a noncontrast study, or an incorrect component modifier.
Next Steps
- Billing the contrast-enhanced study instead? See our CPT 74177 CT abdomen and pelvis guide for the with-contrast side of the same code family.
- Splitting the professional and technical components? Our modifier 26 billing guide covers the PC/TC indicator, place-of-service rules, and the denials that follow from getting them wrong.
- Billing ultrasound alongside CT? Our CPT 76700 complete abdominal ultrasound guide works through the complete versus limited distinction.
- Reviewing reimbursement exposure? The 2027 site-neutral imaging proposal names noncontrast CT specifically.
- Looking for a billing partner? Read how to find the right radiology medical billing service and what to look for in a specialist.
If contrast-protocol mismatches, component modifier errors, or unbundled region codes are costing your practice revenue on CT claims, a specialised radiology billing partner fixes the workflow at the source rather than appealing one denial at a time. Billing Service Quotes has connected more than 2,000 providers across all 50 states, with over 15 years in medical billing and rates starting as low as 2.95%. Finding a match is 100% free for providers.
