What Is Modifier TC in Medical Billing? Complete Guide to Uses, Examples & Reimbursement

Work through those three questions honestly and the answer reveals itself. Here are the most common situations where modifier TC belongs on your claim.

Freestanding Imaging Centers. Your center performs the scan. A contracted radiology group reads it remotely. You bill TC. They bill 26. Both claims go to the same payer. Both get processed independently.

Hospital Outpatient Departments. The hospital performs the technical work of an imaging study. The staff radiologist employed or contracted through a separate professional group interprets it. Hospital bills TC on the CMS-1500. Radiologist bills 26 on a separate claim.

Reference Laboratories. Surgeon removes a skin lesion. Sends the specimen to your lab. Your pathology team processes it, stains the slides, prepares the material. The pathologist provides the microscopic read and signed report. Lab bills the pathology CPT with modifier TC. Pathologist bills with modifier 26.

Portable X-Ray Suppliers. Your team brings radiographic equipment to a nursing home or homebound patient’s residence. You provide the equipment and the technician. Someone else reads the image. You bill TC.

Cardiology Diagnostics. An EKG or echocardiogram is performed at a facility and interpreted by a cardiologist separately. The entity that ran the test — and doesn’t own the interpretation — bills TC.

The unifying logic across every one of these scenarios is the same. If your entity performed the procedure but did not produce the formal interpretation report, modifier TC is your modifier.

For practices managing complex imaging workflows across multiple sites, the question of who bills what  and when gets operationally complicated fast. iRCM’s radiology billing services are built specifically to untangle those workflows and ensure each entity gets paid accurately for its component.

A Real-World TC Modifier Example

Let’s walk through exactly how this plays out from start to finish.

Patient. 58 years old. Persistent lower back pain. Ordering physician writes a referral for a lumbar spine MRI with and without contrast : CPT 72158.

She goes to an outpatient imaging center. The center owns the MRI machine. Their technologist positions her, administers contrast, and completes the scan protocol. The images are transmitted digitally to a professional radiology group that has a contract with the center.

A board-certified radiologist reviews the series. Dictates a formal interpretation. Signs the report.

One study. Two claims.

The imaging center submits CPT 72158 with modifier TC. This claim covers the machine, the room, the contrast supplies, the tech’s time, and facility overhead.

The radiology group submits CPT 72158 with modifier 26. This claim covers the radiologist’s professional work, interpretation time, and professional liability allocation.

Medicare processes both claims independently. It looks up CPT 72158 in the fee schedule, pulls the TC relative value units for one claim and the professional component RVUs for the other, applies the conversion factor to each, and pays them separately.

No duplication. No overbilling. No compliance issue. The modifier TC is doing exactly what it was built to do.

TC Modifier Reimbursement 

Let’s talk money  because this is where many practices are quietly losing revenue without realizing it.

Under Medicare’s Resource-Based Relative Value Scale, every CPT code with a PC/TC indicator of “1” carries three separate RVU sets: one for the global service, one for modifier 26, and one for modifier TC. Each set is multiplied by the Medicare conversion factor to arrive at a dollar allowable.

For 2026, the CY 2026 Medicare Physician Fee Schedule final rule kept existing modifier TC definitions and usage rules in place. What changed were the underlying RVU values and the conversion factor, meaning the actual dollar amounts behind the same codes shifted from 2025 even though the coding logic stayed identical. 

Some individual codes also saw RVU redistributions between the professional and technical components as CMS revalued services based on updated cost data.

The practical implication: if you are billing the same codes you billed last year with the same modifiers, your reimbursement may be different. Not because you did anything wrong. Because the fee schedule moved.

A few things worth knowing about how the TC reimbursement value is calculated relative to the professional component:

Technical components are typically weighted toward equipment depreciation, supply costs, and non-physician staff time. Procedures that are equipment-intensive like advanced CT, MRI, PET, carry higher TC RVUs relative to the professional component because the cost structure reflects the capital investment.

Interpretation-heavy studies shift the balance toward the professional side. A complex nuclear medicine read or an echocardiogram interpretation requires substantial physician time, and the PC RVUs reflect that.

There is no universal percentage split. You cannot assume that TC always represents 60% or 70% of the global rate. The split varies significantly by code. Always verify the current MPFSDB for exact TC values before estimating expected reimbursement for any given procedure.

From a payer policy standpoint, UnitedHealthcare’s 2026 Commercial reimbursement policies confirm that they follow CMS PC/TC indicators as the basis for determining component eligibility. 

When the TC and modifier 26 are submitted by different entities for the same service, UHC considers both independently eligible for reimbursement, provided neither is submitted under the same tax identification number as the other.

The Difference Between Modifier 26 and TC Modifier

Side by side, the difference between modifier 26 and modifier TC comes down to one question.

Who did what?

Modifier 26 goes on the claim of the entity that provided the physician brain the interpretation, the clinical judgment, the formal written report.

Modifier TC goes on the claim of the entity that provided the physical infrastructure, the machine, the technologist, the room, the supplies.

Beyond that core distinction, there are nuances that matter in practice.

Entity eligibility is not the same for both. A physician can bill modifier 26 from virtually any setting. Interpretation is portable  it follows the physician wherever they work. But modifier TC is not portable in the same way. A physician cannot bill TC for a study performed at a hospital they do not own. The technical component belongs to whoever controls the equipment and staff resources.

The reimbursement weighting differs. For most diagnostic imaging codes, the TC represents a larger share of the global rate than the professional component. Equipment costs, staff costs, and facility overhead dominate the cost structure of radiology and diagnostic testing. This is why imaging centers have a strong financial interest in correct TC billing — the dollars are substantial.

Compliance exposure differs by component. Modifier 26 can generally be billed by a physician separately from a facility even in a hospital outpatient setting, as long as the physician truly provided the interpretation. Modifier TC faces more restrictions in institutional settings, which is where the UB-04 question becomes relevant.

Understanding the interplay between modifier 26 and modifier TC is part of a broader literacy around how modifiers shape reimbursement across different clinical situations. The same underlying logic  that modifiers communicate billing context that the CPT code alone cannot  applies in surgical billing with modifiers like modifier 79, where the modifier signals an unrelated procedure in the postoperative period. The coding discipline is consistent even when the clinical context changes.

Can Modifier 26 and TC Be Billed Together?

Short answer: Not by the same entity, on the same line, for the same service.

Appending both TC and 26 to a single claim line effectively tells the payer that you performed the global service, meaning you should have submitted the global code with no modifier at all. That generates a denial or, in audit scenarios, a flag for potential overbilling.

However, and this is the part that confuses people, modifier 26 and modifier TC are billed simultaneously all the time. Just by different entities, on separate claims.

When the imaging center submits TC and the radiology group submits 26 for the same study on the same date, payers process them independently. That is the whole design. Neither claim triggers a duplicate denial because they carry different NPI numbers and different tax identification numbers.

The situation that creates real problems is when a single provider entity tries to bill both components under the same TIN on separate claim lines. Payers treat this as improper unbundling. 

Even if the provider genuinely purchased technical services from an outside supplier, billing both components under the same TIN is still considered unbundling under CMS guidelines and virtually every major commercial payer’s policy. 

The correct approach in that situation is to submit the global code and account for the technical service purchase separately in your internal books.

If your practice is seeing duplicate denial errors on TC claims that you know are legitimate, run a TIN-level audit on the claims in question. The diagnosis is almost always that both components are traveling under the same identifier somewhere in the submission chain.

Is Modifier TC Reported on the UB-04 Claim Form?

Here is the question that generates more confusion in facility billing circles than almost any other modifier question.

The answer most of the time is no, and the reason is worth understanding.

The UB-04 claim form is an institutional billing form used by hospitals, skilled nursing facilities, home health agencies, rehabilitation centers, and other facility-based providers. It operates on a completely different billing logic than the CMS-1500, which is the professional claim form used by physicians and non-institutional providers.

On a UB-04, the revenue code assigned to each service line already communicates the nature of the service. Revenue codes inherently identify facility-provided technical services. A hospital billing imaging services under the appropriate revenue code on a UB-04 is, by definition, billing for technical resources. The payer already knows the service is technical in nature. Appending modifier TC is redundant and it adds nothing to the claim that the revenue code has not already communicated.

Per published Molina Healthcare coding policy, facilities billing on UB-04 are presumed to be providing the technical component of a service, making the modifier unnecessary for standard institutional claims. AAPC’s published forum guidance from experienced hospital billers with decades of practical experience reinforces that no standard payer requires modifier TC on a UB-04, and many will reject or ignore it when it appears there.

Now the exception is worth knowing.

UnitedHealthcare’s 2026 Commercial reimbursement policy documentation explicitly states that their PC/TC policy applies to services billed on CMS-1500 forms “and, when specified, to those billed on UB04 forms.

” That qualifying phrase ‘when specified”  means that for certain services or certain contract arrangements, UHC may require modifier TC on outpatient UB-04 claims. Providers contracted with UHC should verify this against their specific payer instructions and any applicable Local Coverage Determinations from their Medicare Administrative Contractor.

The practical rule for your billing team: if you are a physician group or IDTF submitting on CMS-1500, modifier TC is a standard, required element of your TC claims. If you are a hospital or institutional facility submitting on UB-04, modifier TC is generally not used  but check your payer contracts and MAC guidance before assuming that applies universally to every payer you work with.