13.1 Radiology: Technical Component, Contrast, and Interventional

Why this topic matters for facility outpatient coding

Quick Answer: In a hospital outpatient department, the facility typically reports the technical component of diagnostic radiology on the UB-04 without modifier 26 or TC. The interpreting physician reports the professional component with modifier 26 on the CMS-1500. Choose one contrast family code (without, with, or without-then-with), report the most comprehensive view code rather than extra views, and distinguish diagnostic imaging from interventional work that includes a procedure plus supervision and interpretation.

Radiology is a high-volume hospital outpatient service and a frequent Certified Outpatient Coder (COC) scoring item because the same Current Procedural Terminology (CPT) code can legally appear on two different claims for one encounter. The hospital outpatient department (HOPD) reports equipment, technologist time, contrast supplies, and room use. The radiologist reports interpretation and a signed report. Candidates who carry physician-office habits onto the institutional claim append modifier 26 to the hospital line, or they append modifier TC on a typical UB-04 technical line. Both moves apply Medicare Physician Fee Schedule (MPFS) split-billing mechanics to a claim that is already presumed to be technical. This independent OpenExamPrep chapter teaches those facility rules for learners studying for the COC exam. It does not claim AAPC or Centers for Medicare & Medicaid Services (CMS) endorsement.

Technical component versus professional component

Most diagnostic radiology CPT codes describe a global service that can split into two pieces. The technical component (TC) is the facility piece: imaging equipment, supplies (including contrast when the facility furnishes it), technologists, and overhead. The professional component (PC) is physician work: protocol oversight as applicable, interpretation, and a written report.

Modifier 26 reports the professional component only. Modifier TC reports the technical component only when that split is billed on a professional CMS-1500 or 837P claim. Before using either modifier, check the MPFS PC/TC indicator. Indicator 1 means both components exist and 26/TC are valid. Indicator 2 is professional-component-only; do not add 26. Indicator 3 is technical-only. Global-only codes should not take 26 or TC. Evaluation and management codes and most surgical codes are not radiology component services.

CMS Internet-Only Manual Publication 100-04, Medicare Claims Processing Manual, Chapter 13, states that when the professional interpretation of a diagnostic test is billed separately, it is identified with modifier 26. Place of service on the professional claim follows where the beneficiary received the technical service, not where the radiologist sat while reading. A radiologist interpreting a hospital emergency department computed tomography (CT) study from a remote workstation still reports the hospital or emergency department place of service associated with the technical exam.

How the hospital reports the technical piece

Hospitals paid under the Outpatient Prospective Payment System (OPPS) report the radiology CPT or HCPCS code on the UB-04 (837I) with an imaging revenue code, commonly in the 032x through 035x or 040x families depending on modality. The institutional claim is presumed to be the technical component. Modifier TC is not usually appended on the hospital UB-04. Modifier TC belongs in professional settings when a supplier performed only the technical portion, such as an independent diagnostic testing facility or an office that owns the equipment while another physician interprets.

Do not report a hospital technical line with modifier 26. Do not report a global (no-modifier) professional line for a hospital-performed exam if the physician did not furnish the technical component. Double-billing the technical piece—hospital UB-04 plus a physician 1500 with TC or as a global service—is a compliance failure.

Contrast: without, with, and without-then-with families

Computed tomography and magnetic resonance imaging (MRI) are organized in contrast families. CPT typically publishes three related codes for a body region: without contrast; with contrast; and without contrast followed by with contrast and further sections. The 2026 National Correct Coding Initiative (NCCI) Policy Manual Chapter IX states that there are separate codes for these combinations and that all images necessary to complete a study are included in the CPT description. Report one family member that matches the documented protocol. Do not report a without-contrast code plus a with-contrast code for a single session that was planned and performed as a without-then-with study. Do not unbundle extra sequences or extra slices as additional units of the same code when they complete that study.

Oral or rectal contrast used to complete a gastrointestinal series is integral; do not separately report an administration code for that contrast. When a diagnostic CT or MRI requires parenteral contrast, NCCI Chapter IX treats vascular access and infusion or injection administration codes as integral to the imaging procedure. Do not add hydration or therapeutic infusion codes merely because contrast was injected for the scan. Contrast media itself may be reported with the applicable HCPCS product code when the payer and OPPS status indicator make the product separately payable. Packaging thresholds change by calendar year, so verify the current OPPS Addendum rather than memorizing a dollar figure for a specific vial.

If the record shows only non-contrast imaging, do not upgrade to a with-contrast code. If contrast was given and further post-contrast series were obtained as part of the same study, choose the with or without-then-with code that the documentation supports. Preliminary scout images and delayed images needed to complete the same study are not separately reportable under NCCI.

Supervision levels (conceptual)

Medicare diagnostic test rules in 42 CFR 410.32 use three supervision levels. General supervision means the procedure is performed under the physician's overall direction and control, but the physician's presence is not required during the test. Direct supervision means the supervising physician or other allowed practitioner, where CMS permits, must be immediately available to furnish assistance and direction. For calendar year 2026, the Physician Fee Schedule final rule permanently allows that immediate availability for many diagnostic tests to be met through real-time, two-way audio and video; audio-only is not enough. Personal supervision means the physician is in attendance in the room during the procedure.

Contrast-enhanced CT and MRI commonly require direct supervision because personnel must be able to manage contrast reactions. That is a supervision and coverage concept; it does not by itself change whether the hospital reports the technical CPT code. Personal supervision is reserved for tests CMS designates at that level. On the exam, read the stem for who was present and what the test required. Do not assume every hospital CT is personally supervised, and do not assume general supervision covers contrast-enhanced MRI.

Interventional radiology versus diagnostic imaging

Diagnostic radiology produces an image and an interpretation: radiographs, ultrasound, CT, MRI, or nuclear medicine imaging. Interventional radiology (IR) is a procedure: access, catheter work, biopsy, drainage, embolization, or similar intervention, often with a radiology supervision and interpretation (S&I) component.

NCCI Chapter IX distinguishes non-interventional diagnostic imaging from interventional and invasive diagnostic imaging. For IR, report the surgical or procedural CPT code that describes the intervention, plus the radiology S&I code when CPT instructions pair them and both components were performed. Fluoroscopy inherent in completing an S&I or interventional procedure is not separately reported as a generic fluoroscopy code unless CPT or CMS creates a specific exception. Localization or guidance is integral unless CPT parentheticals instruct you to report a specified guidance code. A true diagnostic angiogram performed to define anatomy, followed by a decision to intervene, may be separately reportable with an NCCI-associated modifier (often 59 or XU) when the policy conditions are met. Dye injections used only to perform the intervention are not a second diagnostic angiogram. Limited historical inquiry, allergy check, and consent for the imaging or IR procedure are not a separately reportable evaluation and management (E/M) service. A significant, separately identifiable E/M may be reported with modifier 25 only when the documentation supports work beyond the procedure.

NCCI and additional views

For a given radiographic series, report the procedure code that most accurately describes what was performed. If a descriptor says a complete exam is a minimum of two views and three views of the same shoulder are taken, report the complete shoulder code once—not a one-view code plus the complete code. If films are repeated for poor quality or the radiologist requests more views to finish the same interpretation, still report one comprehensive code, even if the patient left and returned. Separate reporting is appropriate when additional films are needed because the patient's condition changed, or when a distinct study of a different problem is documented and an NCCI procedure-to-procedure (PTP) associated modifier is allowed.

Do not unbundle a bilateral mammography code into two unilateral codes. Screening and diagnostic mammography on the same date, when both are performed, follow Medicare's modifier GG on the diagnostic study and 59 or XU on the screening study (NCCI Chapter IX). Post-procedure confirmation chest radiographs after central line or chest tube placement are generally integral to those procedures.

Hospital outpatient scenario

An emergency department patient undergoes CT of the head without contrast. The hospital owns the scanner and employs the technologist. A contracted radiology group interprets the study and issues a signed report. The HOPD reports the without-contrast head CT CPT code on the UB-04 with the appropriate imaging revenue code and no 26 or TC modifier. The radiology group reports the same CPT code with modifier 26 on the CMS-1500, using the hospital or emergency department place of service. If the protocol had been without then with contrast, both parties would report the without-then-with family code—not two CT codes stacked on the same session.