CPT code 74261 – Diagnostic CT colonography without contrast

Key takeaways

CPT code 74261 is diagnostic CT colonography without contrast, and 74263 is its screening counterpart. The two can’t be billed on the same date.

Medicare has covered screening CT colonography under 74263 since January 1, 2025, for average-risk patients aged 45 and older.

Medicare pays 74261 on documented medical necessity, such as an optical colonoscopy that was contraindicated or incomplete.

Append modifier 26 or TC when the radiologist and the facility bill separately.

The 2026 Medicare fee schedule gives 74261 a work RVU of 2.34 and a national payment of about $409 before geographic adjustment.

CPT code 74261: Official descriptor and key facts

CPT code 74261 reports a diagnostic CT colonography (CTC) performed without contrast material, with image postprocessing included. Use it when the patient has symptoms or known disease, or when optical colonoscopy is contraindicated or was incomplete. The American Medical Association lists it in the Gastrointestinal Tract subsection of Diagnostic Radiology.

The official descriptor reads: Computed tomographic colonography, diagnostic, including image postprocessing; without contrast material(s). Two phrases in it shape the claim. “Including image postprocessing” means 3D reconstruction is bundled and can’t be billed separately. “Without contrast material(s)” means a study with contrast goes to CPT 74262 instead.

74261 vs 74263: Diagnostic vs screening CT colonography

74261 and 74263 describe the same CT acquisition, so the reason for the order decides the code. A patient with symptoms, known disease or a failed colonoscopy gets 74261. An asymptomatic, average-risk patient having routine screening gets 74263. Check the referring physician’s order and the chart notes before you pick either one, then work through the three questions below.

The table sets the two codes side by side on coverage, payer treatment and diagnosis linking.

CPT 74261 vs 45378: Virtual colonoscopy vs optical colonoscopy

CPT 45378 describes conventional optical colonoscopy, in which a flexible endoscope is advanced through the colon. CPT code 74261 covers the non-invasive CT alternative. Coders meet both when an optical colonoscopy can’t be completed, for example because of an obstruction or patient intolerance. A CTC then follows on the same date or a later one.

Documentation requirements and ICD-10 codes for CPT 74261

Every CPT code 74261 claim needs documentation that establishes why a non-invasive CT approach was chosen over optical colonoscopy. Payers look for this reasoning in the ordering physician’s referral note and the radiologist’s interpretation report. Proper medical billing compliance requires the record to include all of the following before the claim is submitted.

• Clinical indication: Patient symptoms, known pathology, or a documented contraindication to optical colonoscopy. Examples include an incomplete prior colonoscopy, an anatomic obstruction or anticoagulation that can’t be interrupted.
• Bowel preparation: Notation confirming bowel prep was completed and adequate for interpretation.
• Radiologist interpretation report: Signed report describing findings, 3D reconstruction review, and comparison to prior studies where applicable.
• Ordering physician’s order: Written referral with a clinical indication that matches the ICD-10 code submitted.
• 3D reconstruction notation: Confirmation that postprocessing was performed (it is bundled in 74261 and must be documented).

The ICD-10 codes paired with CPT code 74261 must show why a diagnostic study was needed. A primary screening diagnosis such as Z12.11 on a 74261 claim signals a code mismatch and triggers a denial.

Modifiers used with CPT code 74261

CPT code 74261 is a global radiology code. It is often split between the interpreting radiologist and the facility that provides the CT equipment and staff. This split billing is the most common modifier scenario coders encounter on 74261 claims.

Never append both modifier 26 and TC to the same claim line. The global bill (no modifier) is appropriate only when one entity owns the equipment and employs the interpreting radiologist.

Reimbursement and RVU data for CPT code 74261

CMS publishes annual payment rates through the Physician Fee Schedule look-up tool. For 2026, 74261 carries a work RVU of 2.34 and a total RVU of 12.25. At the 2026 conversion factor of $33.4009, that comes to about $409 nationally before geographic adjustment.

Verify current-year rates through CMS before you use them in fee negotiations. Commercial rates vary widely, from non-covered to well above Medicare.

Medicare and commercial payer coverage for CPT code 74261

Medicare has covered screening CT colonography under 74263 since January 1, 2025. The benefit applies to asymptomatic, average-risk patients aged 45 and older, with no deductible or coinsurance. CPT code 74261 stays a diagnostic code, covered when the chart documents medical necessity, such as a contraindicated or incomplete optical colonoscopy.

A 74261 claim that carries a screening ICD-10 code is denied as a code and diagnosis mismatch. The service itself is covered, so the fix is recoding the claim correctly.

Commercial payer coverage is inconsistent. The table below shows the general picture. Policies change every year and vary by plan, so confirm current policy before scheduling the study.

When a payer requires prior authorization, the request should include the following documents.

• The ordering physician’s clinical notes documenting why optical colonoscopy can’t be performed.
• The specific ICD-10 code supporting the request.
• Any prior colonoscopy report, if the study follows an incomplete procedure.

Run insurance eligibility verification before you schedule the study. It shows whether the patient’s plan excludes CTC before a claim ever goes out.

Common CPT 74261 claim denial reasons and how to appeal

CPT code 74261 attracts denials because it sits where radiology coding, colorectal screening policy and payer medical necessity rules meet. Most denials fall into one of six categories, each with its own fix. A denial management workflow shows which documentation problems keep coming back, so you can fix them at the source.

• Screening and diagnostic mismatch (Z12.11 on a 74261 claim): The diagnostic code went out with a screening diagnosis. If the study was diagnostic, resubmit with the correct diagnostic ICD-10 code and the referring physician’s notes. If it was a screening study, recode it as 74263.
• Lack of medical necessity documentation: The payer’s utilization management team found no clinical notes supporting why CTC was ordered instead of optical colonoscopy. Appeal with the full clinical record, including any prior colonoscopy report and the physician’s documented rationale.
• Wrong code selected (74261 vs 74263 mismatch): A screening-intent chart was coded as 74261, or vice versa. This triggers a diagnosis-code mismatch denial. Correct the code and resubmit. A straightforward correction needs no appeal letter.
• Missing prior authorization: The claim was submitted without an authorization number when the payer required one. Some payers grant retroactive approval within a set window, so call the payer’s provider line immediately.
• Bundling conflict with same-day 45378: Submitting 74261 and 45378 on the same date without modifier 59 triggers an NCCI edit denial. Add modifier 59 to 74261 and provide documentation confirming the colonoscopy was incomplete before the CTC was performed.
• Global billing error (modifier required): The claim was filed globally when the radiologist is not affiliated with the facility. Resubmit with modifier 26 on the physician claim and modifier TC on the facility claim.

Find the claim adjustment reason code (CARC) on the 74261 explanation of benefits (EOB). Then look it up among common medical billing denial codes and match your appeal to it. For clean claim submission, verify the ICD-10 pairing, the modifier and any authorization before sending.

NCCI bundling edits and codes that cannot be billed together

The National Correct Coding Initiative (NCCI) bars billing 74261 and 74263 on the same date of service. 74261 also can’t be billed alongside a same-day optical colonoscopy (45378) without modifier 59 and documented necessity for both procedures. The 3D postprocessing is bundled into the 74261 descriptor. Billing a separate 3D rendering code alongside it is an unbundling violation.

Clinical contraindications that affect claim approval

Payers may deny 74261 claims when patient factors suggest the procedure isn’t appropriate, or when the documentation doesn’t address them. These factors come up most often in coverage policy denials.

• Bowel surgery within the preceding 12 months.
• Severe obesity that limits image quality (typically a BMI above 40 under some LCD policies).
• Active inflammatory bowel disease during a flare.
• The presence of a colostomy.

None of these is an absolute coding prohibition. Each one, though, needs the referring physician’s notes to explain why CTC is still the best diagnostic approach for that patient.

How claims management software prevents 74261 denials

Most 74261 denials start at charge entry. A coder picks the code from the order, someone adds a modifier later, and the diagnosis pairing goes unchecked until the remittance comes back short.

Pabau, the practice management platform we build, moves those checks to the front of the process. Its claims management software lets your team attach modifier 26 or TC at charge entry. Eligibility checks run before the study, and claims go out electronically through our Claim.MD integration.

When a payment does come back short, the remittance codes sit against the claim. Your team can see whether the code, the diagnosis or the modifier caused it, and fix the pattern for every future claim.

Catch 74261 coding errors before submission

Pabau attaches modifiers at charge entry, checks patient eligibility and tracks remittance codes. Your team fixes errors before a payer denies the claim.

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Conclusion

Before you code a CT colonography, read the order and the chart. Since 2025, Medicare pays for screening studies under 74263, so 74261 belongs to patients with a documented diagnostic reason.

The trade-off is effort up front. A 74261 claim needs more documentation than a screening claim, but each missing note or modifier costs a resubmission later. Build the indication, the modifier and the eligibility check into charge entry, and those denials stop repeating.

Book a demo to see how Pabau helps your billing team catch 74261 coding errors before the claim goes out.

Continue your research

Need to understand how clearinghouse submission works for radiology codes? Our Claim.MD clearinghouse guide explains how electronic claim routing and real-time payer edits work.

Dealing with repeated claim rejections? Electronic remittance advice (ERA) explained covers how to read 835 files and act on adjustment reason codes quickly.

Want the bigger picture beyond one CPT code? What is revenue cycle management? covers the full billing lifecycle from charge capture through payment posting.

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