Ask any radiology practice administrator what keeps them up at night, and modifier errors will come up faster than you’d expect. It sounds like a small, technical detail: a two-character code appended to a CPT, but in 2026, Modifier 26 and TC mistakes are quietly draining thousands of dollars a month from practices that otherwise run tight operations.
Here’s the frustrating part: these aren’t complicated errors caused by rare edge cases. They’re common errors that occur due to the combination of professional and technical elements involved in radiology billing, and most billing departments just weren’t designed to manage them properly.
The Professional vs. Technical Split, Explained Simply
Radiology is one of the few specialties where a single service can be billed in three different ways. The professional component of the radiologist’s interpretation and report is covered by Modifier 26. Modifier TC is for the technical component, equipment, technologist, or facility overhead needed to make the imaging possible. And if one entity owns both the machine and uses the physician who interprets, there is not one modifier that goes with the claim.
The problem begins when the billing staff doesn’t get the right answer to the question: which scenario is it? A Radiologist reading films for a hospital would not have ownership of the imaging device and thus would require Modifier 26. A billing facilitator should bill the imaging center for his/her share of the interpretation, and the imaging center should bill the TC under Modifier 26 for its share of the MRI billings. Combine these and duplicate claims, parts, or claims that are marked with the modifier opposite of what the payer is looking for.
Why 2026 Has Made This Worse, Not Better
You’d think that after years of practice, this would be a solved problem. Instead, several 2026 shifts have made modifier errors more common, not less.
Payer edits have become more focused. Insurers have spent millions on computer programs that automatically detect modifier mismatches and stop claims in their tracks, leaving those errors to bounce back in the form of denials in days. Radiology groups are now reading in multiple environments: hospital, outpatient center, teleradiology services, and as the number of environments goes up, the number of billing scenarios a single practice has to keep track of is multiplied.
Then there’s the CMS shared or leased equipment area that has been magnified this year. Things that once worked out informally are now attracting audits.
What Modifier Errors Actually Cost
When Modifier 26/TC mistakes cause loss of revenue, it’s not as if they’re all falling out of your hand. It is seen as a thousand pinches: a refused claim, a late payment, a claim that goes to the payer’s desk after three weeks because nobody caught the mistake.
If a modifier is not used correctly, it can delay payment by 30-45 days until the claims are corrected and resubmitted. A number of dozen studies per week multiplied by that equals practices paying themselves an interest-free loan. More serious, frequent modifier errors to a single provider’s claims can lead to an audit of that provider’s entire practice, and not just the claims that have been flagged for error.
There’s the less obvious expense, too: undercoding due to caution. Some billing groups simply don’t know which modifier to use, so they bill only the professional service even if the practice also offers the technical service. That is money that is lying on the table each and every time it occurs.
Getting the Split Right Consistently
The fix isn’t complicated in theory, but it does require discipline. Billing personnel should have a clear record of who is responsible for the equipment used at each of the imaging sites where the radiologist works at, and that information should be updated whenever there is a change in contracts or arrangements. Before claims are sent, coding teams can use a pre-established list of modifiers that correlates each referring facility to the appropriate modifier rather than having to figure it out on the fly.
Internal audits are also helpful on a regular basis. Checking a random sample of imaging claims monthly for modifier accuracy helps prevent drift from becoming a trend that payers discover in their claims.
This is precisely where many radiology practices find it more sustainable to work with billing teams who specialize in imaging services rather than trying to build that expertise in-house from scratch. Outsourcing to radiology billing companies means that they handle all radiology billing across multiple settings and equipment arrangements daily and tend to catch these modifier mismatches before claims go out the door, not after a denial arrives. For practices juggling hospital reads, outpatient centers, and teleradiology contracts at once, that kind of specialized oversight often makes the difference between chasing denials and getting paid on the first pass.
The Bottom Line
Modifier 26 and TC errors are not pretty bugs and that’s why they continue to exist. No announcements are made like a big coding scandal. They simply nibble away at revenue, month after month until a practice looks at its denial reports and is amazed at how much has been missed.
When modifier accuracy becomes a process, not an afterthought, the practices that survive in 2026 are the ones that are ready for the increasingly rigorous payer systems, which are becoming more complex and demanding by the day. Learn more at www.doctormgt.com.
