What is CPT Code 74176?
CPT code 74176 describes a computed tomography (CT) scan of the abdomen and pelvis performed without contrast material. It is one of the most frequently used imaging codes in emergency and outpatient radiology settings, and it falls under the American Medical Association's (AMA) category of Diagnostic Radiology (Diagnostic Imaging) Procedures of the Abdomen.
The official CPT descriptor reads:
74176 — Computed tomography, abdomen and pelvis; without contrast material
In plain language: the radiologist scans both the abdominal region and the pelvic region during a single session, using no intravenous (IV), oral, or rectal contrast dye that would qualify as a contrast-enhanced study.
This code is maintained by the AMA and is essential for accurate billing wherever a combined, non-contrast abdominal and pelvic CT is performed.
Clinical Applications: When Is CPT 74176 Used?
CPT 74176 is ordered when a physician needs detailed cross-sectional images of both the abdominal and pelvic organs but cannot or should not use contrast material. The most common clinical scenarios include:
Conditions Diagnosed with CPT 74176
- Kidney stones (urolithiasis) — Non-contrast CT is the gold standard for detecting renal and ureteral calculi because stones are radio-opaque and highly visible without contrast.
- Appendicitis — A non-contrast scan is often sufficient to identify an inflamed or perforated appendix in the emergency setting.
- Acute abdominal or pelvic pain — When the cause is unknown and needs rapid evaluation.
- Diverticulitis — Evaluating the colon for diverticular disease and its complications.
- Abdominal trauma — Screening for organ injury or internal bleeding after accidents.
- Palpable abdominal mass — Identifying the location, size, and characteristics of a suspected mass.
- Bowel obstruction — Checking for intestinal obstructions or strangulation.
- Hernias — Evaluating umbilical, incisional, or Spigelian hernias when physical exam and ultrasound are inconclusive.
Why Non-Contrast? Clinical Rationale
Non-contrast CT scans are preferred in several important circumstances:
- Contrast allergy — Patients with a documented allergy to contrast agents undergo non-contrast imaging to avoid allergic reactions.
- Renal impairment — Patients with an estimated glomerular filtration rate (eGFR) of 30 mL/min or less are at risk for contrast-induced nephropathy; non-contrast scans eliminate this risk.
- Pregnancy considerations — Contrast use may be restricted depending on trimester and clinical urgency.
- Cost and speed — In emergency settings, a non-contrast scan is faster, less expensive, and does not require IV access or post-procedure monitoring.
Important Note per AMA Guidelines: Oral or rectal contrast administration alone does not qualify a scan as "with contrast." Contrast must be administered intravenously, intra-articularly, or intra-thecally to warrant a different code.
CPT 74176 vs. 74177 vs. 74178: Key Differences
The AMA defines three CPT codes for combined CT imaging of the abdomen and pelvis in a single session. Understanding the distinction is critical for accurate billing.
| CPT Code | Description | When to Use |
|---|---|---|
| 74176 | CT abdomen and pelvis without contrast material | Both regions scanned with no IV contrast |
| 74177 | CT abdomen and pelvis with contrast material(s) | Both regions scanned with IV contrast |
| 74178 | CT abdomen and pelvis without, followed by with contrast | One or both regions scanned first without contrast, then with IV contrast — same session |
Key Rules for Code Selection
- Report only one of these three codes per CT abdomen and pelvis examination per claim.
- 74176 applies when neither region receives IV contrast.
- 74177 applies when both or either region receives IV contrast (and no non-contrast phase is obtained).
- 74178 applies when the scan begins without contrast and is then followed by IV contrast in the same visit — this represents two scan phases, not one.
Critical distinction: 74176 and 74177 represent a single phase. 74178 represents two phases (non-contrast + contrast) within one encounter. Never report 74176 and 74177 together for the same visit; that constitutes improper unbundling. Instead, use 74178.
Who Can Bill CPT Code 74176?
There is a common source of confusion about who may submit claims under CPT 74176. The general rules are:
- Radiologists — The most common billing provider. They perform the technical procedure and interpret the images.
- Hospital outpatient departments — Facility billing is common in emergency room contexts.
- Freestanding imaging centers — May bill for both the technical and professional components globally.
- The ordering/referring physician — Generally cannot bill 74176 unless they personally perform the scan and interpret the results themselves, which is rare outside of certain clinic settings.
When the professional interpretation (reading and reporting) and the technical component (the actual scanning equipment and operation) are billed by the same entity, the global code is used without any modifier. When billed separately, modifiers 26 and TC apply (see below).
Modifiers for CPT Code 74176
Modifiers are two-digit suffixes appended to a CPT code to provide additional context to the payer. The following modifiers are applicable to CPT 74176:
Modifier 26 — Professional Component
Append modifier 26 to CPT 74176 when the billing provider is submitting only for the physician's professional work — that is, the reading, interpreting, and reporting of the scan findings. The facility or imaging center would separately bill the technical component.
Example: A radiologist employed by a hospital reads and dictates results from a CT scan performed by hospital equipment. The radiologist bills 74176-26; the hospital bills 74176-TC.
Modifier TC — Technical Component
The TC modifier is appended when the entity is billing solely for the technical portion of the service (scanner, technologists, facility overhead), not for interpretation.
Modifier 59 — Distinct Procedural Service
Modifier 59 is used when CPT 74176 is performed as a separate and distinct procedure from another imaging service on the same date of service. This most commonly applies when:
- A non-contrast CT (74176) and a contrast CT (74177) are performed during two separate, clinically distinct visits within the same day (e.g., 10 AM and 3 PM for different clinical questions).
- A combined abdomen/pelvis CT is performed alongside a separate, stand-alone CT of only the abdomen or pelvis for a different indication.
Warning: Modifier 59 must never be used to bypass bundling rules for the same encounter. Using it incorrectly to unbundle 74176 and 74177 for a single dual-phase study — instead of billing 74178 — constitutes fraudulent billing.
Modifier XU — Unusual Non-Overlapping Service
Some payers (especially under NCCI edits) now accept modifier XU in place of modifier 59 when reporting a distinct procedure that is separate because it does not overlap with the other service. Always verify which modifier the specific payer accepts.
ICD-10 Codes Commonly Paired with CPT 74176
Pairing CPT 74176 with an appropriate ICD-10 diagnosis code is mandatory for demonstrating medical necessity. Below are the most frequently used ICD-10 codes with this procedure:
| ICD-10 Code | Description |
|---|---|
| R10.9 | Unspecified abdominal pain |
| R10.0 | Acute abdomen |
| N20.0 | Calculus of kidney |
| N20.1 | Calculus of ureter |
| N20.9 | Urinary calculus, unspecified |
| K35.80 | Other and unspecified acute appendicitis |
| K57.30 | Diverticulosis of large intestine without perforation or abscess |
| K80.20 | Calculus of gallbladder without cholecystitis, without obstruction |
| R19.00 | Intra-abdominal and pelvic swelling, mass or lump, unspecified site |
| S39.91XA | Unspecified injury of abdomen, initial encounter |
| R63.4 | Abnormal weight loss |
| K56.60 | Unspecified intestinal obstruction |
Medicare's Local Coverage Determination (LCD) L34415 specifically requires documentation of symptoms such as persistent abdominal pain, unexplained weight loss, or suspected masses, linked to covered ICD-10 codes to approve reimbursement for CPT 74176.
Medical Necessity and Documentation Requirements
What Must Be Documented
For CPT 74176 to meet payer requirements, the radiology report and clinical notes must explicitly address the following:
- Contrast Status — The report must clearly state "without contrast material" and, where applicable, provide the clinical rationale (e.g., documented contrast allergy, eGFR < 30 mL/min).
- Both Regions Imaged — Documentation must confirm that both the abdomen and pelvis were scanned. If only one region was imaged, a standalone code (74150 for abdomen or 72192 for pelvis) should be used instead.
- Technical Parameters — Including scan protocol, slice thickness (e.g., 5 mm axial), field of view, radiation dose metrics (CTDIvol and DLP), and reconstruction techniques (e.g., multiplanar reformats). Radiation protocol documentation is increasingly required by payers.
- Clinical Indication and Findings — A direct link between the patient's presenting symptoms, the relevant ICD-10 code, and the imaging findings must be established. The report should describe the organs visualized (liver, spleen, pancreas, kidneys, bowel, bladder, etc.) and note any incidental findings.
- Ordering Physician's Referral — The ordering provider's name and credentials must be on file, as payers verify that imaging was ordered by a qualified clinician.
Appropriate Use Criteria (AUC) Under PAMA
Since the implementation of the Protecting Access to Medicare Act (PAMA), Medicare requires that claims for advanced imaging services like CPT 74176 include documentation of Appropriate Use Criteria (AUC) consultation via a qualified Clinical Decision Support Mechanism (CDSM). Claims must include the appropriate AUC modifier (e.g., ME for educational claims when a CDSM is used for training). Failure to comply can result in claim penalties.
Medicare Coverage and Reimbursement Rates
Medicare Coverage Rules
Medicare covers CPT 74176 under National Coverage Determination (NCD) 220.1, which provides general coverage criteria for computed tomography. The NCD requires that documentation clearly support the medical necessity of the CT scan for the individual beneficiary, taking into account their specific symptoms and potential diagnosis. Routine screening without a clinical indication is not a covered service.
Reimbursement Rates
Medicare reimbursement for CPT 74176 is determined by the Medicare Physician Fee Schedule (MPFS), updated annually by the Centers for Medicare & Medicaid Services (CMS). Rates vary by geographic locality and whether the service is billed globally or split into professional/technical components.
- Average Medicare reimbursement: approximately $200–$300 (depending on locality and setting)
- Facility/outpatient prospective payment: Rates under the Outpatient Prospective Payment System (OPPS) apply for hospital-based outpatient billing and may differ from the professional fee schedule.
Commercial payers (UnitedHealthcare, Anthem, Blue Cross Blue Shield, Aetna, etc.) typically mirror Medicare rates but may also require prior authorization — particularly for outpatient scans. In 2025, many commercial payers have updated their policies to favor freestanding imaging facilities over hospital outpatient departments for cost control.
Always verify current rates through your payer's portal or the CMS Medicare Fee Schedule Look-Up Tool, as rates are updated every January 1.
Common Denial Reasons and How to Prevent Them
Denial rates for radiology claims can reach up to 20%, with CPT 74176 being no exception. The most frequent denial reasons and their prevention strategies are:
1. Incorrect Code Selection
Problem: Billing 74176 when IV contrast was actually administered (should be 74177), or billing separate abdomen and pelvis codes (74150 + 72192) instead of the combined code 74176.
Solution: Always verify the radiology report before coding. Confirm whether any IV, intra-articular, or intra-thecal contrast was used. Use the combined 74176 code for any scan covering both regions without contrast.
2. Insufficient Medical Necessity Documentation
Problem: The claim lacks a clear, documented clinical reason for ordering a non-contrast scan, or the ICD-10 code does not align with the CPT code.
Solution: Ensure referring and treating physicians document specific symptoms (e.g., "acute right flank pain with hematuria; evaluating for ureterolithiasis") in the order and that the radiology report echoes this clinical context. Use the most specific ICD-10 code available.
3. Missing or Incorrect AUC Modifiers
Problem: Claims submitted without the required AUC modifier for Medicare advanced imaging services.
Solution: Train billing staff to consistently append the appropriate AUC modifier for all applicable CPT 74176 claims. Integrate CDSM consultation into the ordering workflow.
4. Lack of Prior Authorization
Problem: Some commercial payers, particularly for outpatient non-emergency settings, require pre-authorization for CT scans.
Solution: Implement an eligibility and prior authorization check before scheduling the scan. Document the authorization number on the claim.
5. Unbundling
Problem: Billing CPT 74150 (CT abdomen without contrast) and CPT 72192 (CT pelvis without contrast) separately on the same day as — or instead of — CPT 74176.
Solution: When both the abdomen and pelvis are imaged in the same session without contrast, always report the combined code 74176. Per NCCI edits, payers will reject the unbundled pair.
6. Duplicate Billing
Problem: Submitting both 74176 and 74178 for the same encounter, or billing 74176 twice.
Solution: Report only one CPT code from the 74176–74178 family per encounter. If a second combined study is truly performed later the same day, use modifier 59 on the second code with appropriate documentation.
NCCI Edits and Bundling Rules
The National Correct Coding Initiative (NCCI), established by CMS, includes edits that specifically prevent improper payment for unbundled imaging codes. Key rules affecting CPT 74176:
- Do not report CPT 74176–74178 together with CPT 72192–72194 (standalone pelvis CT codes) or CPT 74150–74170 (standalone abdomen CT codes) on the same date for the same imaging session.
- Report only once per CT abdomen and pelvis examination.
- Exception for same-day separate studies: If a truly distinct, separately indicated study is performed at a different time, modifier 59 (or XU) may be appended to the standalone code to indicate the services were separate — but this requires solid documentation of the distinct clinical indication, different encounter time, and medical necessity for both.
Understanding and applying these NCCI edits correctly is essential for compliance and avoiding overpayment recoupment during audits.
Quick Reference Summary
| Element | Detail |
|---|---|
| CPT Code | 74176 |
| Full Description | Computed tomography, abdomen and pelvis; without contrast material |
| Code Family | 74176 (no contrast), 74177 (with contrast), 74178 (with and without contrast) |
| Common Settings | Emergency department, outpatient imaging center, hospital radiology |
| Contrast Type | None (IV contrast disqualifies; oral/rectal alone does not qualify a scan as "with contrast") |
| Medicare Coverage | NCD 220.1; LCD L34415 |
| AUC Requirement | Yes, under PAMA for Medicare |
| Key Modifiers | -26 (professional), -TC (technical), -59 (distinct procedure), -XU |
| Average Medicare Reimbursement | ~$200–$300 (locality-dependent) |
| Top ICD-10 Codes | R10.9, N20.0, N20.1, K35.80, R19.00 |
| Common Denials | Wrong code, no prior auth, unbundling, insufficient medical necessity |
Frequently Asked Questions
What is the difference between CPT 74176 and 74150?
CPT 74150 is for a CT scan of the abdomen only (without contrast), while CPT 74176 covers both the abdomen and pelvis in a single scan session without contrast. When both regions are imaged together, 74176 is the correct code. Billing 74150 and 72192 separately for a combined scan is considered unbundling.
Can I bill CPT 74176 and 74177 together on the same day?
Yes, but only if two separate and distinct scans were performed during different sessions on the same day — for example, a non-contrast scan at 10 AM and a contrast scan at 2 PM for a different clinical question. In that case, append modifier 59 or XU to the second code. If both phases were part of one clinical encounter, bill 74178 instead.
Does oral contrast qualify CPT 74176 as "with contrast"?
No. Per AMA guidelines, oral or rectal contrast administration alone does not qualify a study as "with contrast." Only intravenous, intra-articular, or intra-thecal contrast administration would change the appropriate code to 74177 or 74178.
Who submits the claim for CPT 74176 — the radiologist or the hospital?
Both may submit separate claims when billing the professional and technical components separately. The radiologist (or radiology group) bills 74176-26 for interpretation, and the facility bills 74176-TC for the equipment and staff. When the same entity provides both, the global code (74176 without a modifier) is used.
What ICD-10 codes are best for supporting medical necessity for CPT 74176?
The most accepted ICD-10 codes include R10.9 (unspecified abdominal pain), N20.0 (calculus of kidney), N20.1 (calculus of ureter), K35.80 (acute appendicitis), and R19.00 (abdominal mass). Always select the most specific code that accurately reflects the patient's documented clinical presentation.
Is prior authorization required for CPT 74176?
For Medicare, prior authorization is generally not required for emergency presentations, but documentation of AUC consultation is required under PAMA. For commercial payers (especially in elective outpatient settings), prior authorization is commonly required. Always verify with the specific payer before scheduling.
Conclusion
CPT code 74176 is a foundational code in radiology billing, representing the combined CT scan of the abdomen and pelvis without contrast. Accurate use of this code — including correct modifier application, appropriate ICD-10 pairing, thorough documentation, and compliance with NCCI edits — is essential for timely reimbursement, audit readiness, and regulatory compliance.
Whether you are a radiologist, a medical coder, a practice manager, or a billing specialist, understanding the nuances of CPT 74176 relative to its sibling codes 74177 and 74178 will help you prevent costly denials, reduce administrative rework, and maintain a compliant revenue cycle.
This article is intended for educational and informational purposes. CPT codes, reimbursement rates, and payer policies are subject to annual updates. Always consult current AMA CPT guidelines, CMS publications, and your payers' specific policies for the most accurate and up-to-date information.
