Radiology Billing Guide 2026

PC/TC Split, Modifiers, and Interventional Coding

By Yagnesh Dave  ·  June 2026  ·  12 min read

Radiology billing is complex because every imaging study has the potential to be billed in three different ways (globally, as a professional component only, or as a technical component only) depending on who owns the equipment and who performs the interpretation. Layer in contrast vs. non-contrast rules, interventional radiology procedural coding, and NCCI bundling restrictions, and you have one of the highest-complexity billing environments in all of medicine. This guide breaks down each component systematically.

1. The Professional/Technical Component Split

Every diagnostic imaging service consists of two distinct components:

• Technical Component (TC): The equipment, facility, staff, and supplies needed to perform the imaging study. Billed by hospitals and imaging centers that own the equipment.
• Professional Component (PC): The radiologist's interpretation, report, and supervision. Billed by the radiologist or radiology group.
• Global Billing (no modifier): When the same entity owns the equipment AND employs the interpreting radiologist, the full service is billed once with no modifier.

2. Contrast Coding Rules: With vs. Without vs. With and Without

For CT, MRI, and MRA studies, the presence or absence of contrast determines which CPT code to use. Billing the wrong code, especially billing "with contrast" when no contrast was administered, is one of the most audited errors in radiology.

Key rule: "With and without" (code ending in 3) requires documentation of both pre- and post-contrast image acquisition. If the radiologist's report describes only post-contrast images, the correct code is "with contrast", not "with and without." Billing "with and without" when pre-contrast images were not obtained is upcoding.

Oral vs. IV Contrast

For CT of the abdomen and pelvis, oral contrast is commonly used but does NOT alone qualify a study as "with contrast." Only IV contrast (or intrathecal for spine studies) supports billing the "with contrast" code. A CT abdomen/pelvis with oral contrast only = bill as "without contrast."

3. CT and MRI Code Families

4. Interventional Radiology Billing

Interventional radiology (IR) procedures combine an imaging guidance code with a procedural code. Many IR procedures require reporting both the procedural work and the imaging supervision and interpretation (S&I) separately. Understanding which code pairs are bundled vs. separately reportable is essential.

Common IR Code Pairs

5. Ultrasound Billing: Complete vs. Limited Studies

Ultrasound codes have two levels: complete and limited. Billing a limited study when a complete study was performed (or vice versa) is a common audit finding.

• Complete study: All required anatomical elements evaluated and documented. For example, a complete abdominal ultrasound (76700) requires evaluation of the liver, gallbladder, CBD, pancreas, spleen, and both kidneys.
• Limited study (76705): Only one or a few specific organs evaluated, always requires documentation of the clinical reason for the limited scope.

If a complete study is attempted but visualization is limited by patient factors (obesity, bowel gas), document the limitation and what was successfully evaluated. This justifies the complete code even if not all elements were visualized.

6. NCCI Edits and Radiology Bundling

The National Correct Coding Initiative (NCCI) has numerous bundling edits specific to radiology. The most common violations:

• Billing CT and MRI of the same body part on the same date: Rarely appropriate; requires strong clinical documentation of why both were medically necessary simultaneously.
• Bilateral ultrasound codes: Some ultrasound codes are inherently bilateral (e.g., renal ultrasound 76770 includes both kidneys). Don't separately bill for each kidney.
• Nuclear medicine + CT: PET/CT (78816) is a single code, don't separately bill the CT component (74177) when performed as part of a PET/CT.

Radiology Audit Exposure: Contrast, Study Level, and Interpretation

Radiology reviewers compare the report with the code. For CT and MRI, the report has to show whether contrast was given, and a claim for with contrast when none was administered is one of the most common audit findings. For ultrasound, the report has to show that every required element of a complete study was evaluated and documented, or the study is limited. Contractors can look back three years, and on a practice with a recurring pattern here, that lookback can put a large recoupment at stake, before the cost of the appeal.

The professional and technical split adds its own test. A practice that owns the equipment and interprets the study bills globally, and one that does only the reading bills the professional component. Contractors can look back three years, and because imaging volumes are high, a templated report that doesn't capture contrast status repeats on every study. The dollars add up quickly: even a modest error rate here means avoidable revenue loss every year.

Report Templates That Protect the Claim

In radiology, the report is the claim's documentation. A good template captures the elements each code requires, so the coder doesn't have to guess. For CT and MRI, include a field for contrast, its type, and the amount. For ultrasound, list each required structure with a place to record what was seen. For interventional procedures, capture the imaging guidance and the supervision and interpretation separately.

Ask radiologists to review the template once a year, with a coder in the room. It's the fastest way to find the fields that are missing or confusing, and it keeps documentation habits in line with what the codes require.

Check NCCI Edits Before Billing Combinations

Radiology has a long list of code pairs that can't be billed together, such as multiple studies of the same body part on the same day. Load the current edits into your scrubber and review the list of edits that fire most often. If one fires frequently, look at why. Sometimes it's a legitimate combination that needs a modifier and documentation, and sometimes it's a workflow problem in the ordering or scheduling process.

Measure Report Turnaround and Billing Lag

Track how long it takes from exam to signed report to claim. Delays in any step slow payment.

Frequently Asked Questions About Radiology

What's the difference between the technical and professional components?

The technical component covers equipment, facility, staff, and supplies. The professional component is the physician's interpretation. The article explains that a service can be billed globally, professional only, or technical only depending on who owns the equipment and who reads the study.

How do you pick the right CT or MRI code?

By the body part and the contrast: without, with, or without followed by with. The article's table lists code families such as 70450, 70460, and 70470 for head CT, and the report has to support the contrast status.

When is an ultrasound a limited study?

When not all the required elements of a complete study are evaluated and documented. The article says billing a limited study for a complete one, or the reverse, is a common audit finding.