Most oral surgery practices don’t have a billing problem they can see. The lights are on, claims go out, money comes in. But between what you’re collecting and what you should be collecting, there’s a gap. And for the average OMS practice, that gap runs tens of thousands of dollars a year.
The tricky part? Your billing team isn’t doing anything obviously wrong. They’re working hard. They’re submitting claims. They’re following the process they’ve always followed. The revenue leaks are structural, baked into how most in-house billing teams operate, and they’re almost invisible until someone who knows specialty billing takes a close look.
Here are the places where OMS practices lose the most money, and why most billing teams never catch it.
Medical vs. dental routing errors
Oral surgery sits at the intersection of dental and medical insurance. A single procedure, like an impacted third molar extraction, might be billable under dental, medical, or both. The routing decision matters because reimbursement rates can differ dramatically depending on which carrier you bill first.
Most in-house billing teams default to dental. It’s what they know, and it’s the path of least resistance. But for procedures like orthognathic surgery, trauma cases, biopsies, or anything involving general anesthesia, medical insurance often pays significantly more. If your team isn’t trained to evaluate each case for the highest-value routing, you’re leaving money behind on every claim that should have gone medical-primary.
This isn’t a once-in-a-while mistake. Practices that audit their routing decisions typically find that 15-25% of claims were sent to the wrong carrier first. Multiply that by the reimbursement difference and you’re looking at real revenue.
Cross-coding gaps
OMS billing requires fluency in CDT codes (dental), CPT codes (medical), and ICD-10 diagnosis codes. That’s three coding systems your billing staff needs to know cold. Most dental billers learned CDT. Some have picked up CPT basics. Very few are comfortable mapping between all three, and almost none stay current on the annual updates to each system.
The result is missed cross-coding opportunities. A procedure that should generate both a dental and a medical claim only generates one. Or the medical claim goes out with the wrong CPT code because the biller translated from CDT incorrectly. Or the ICD-10 diagnosis code doesn’t support medical necessity, so the claim gets denied.
Each of these errors looks small in isolation. A single missed cross-code might cost you $200-500. But across a full year of procedures, the cumulative loss is substantial. One OMS practice we’ve seen recovered over $180,000 annually just by fixing cross-coding accuracy.
Documentation that doesn’t support the claim
Here’s a pattern that plays out constantly: your surgeon performs a procedure, dictates notes, and the billing team submits a claim based on those notes. The claim gets denied for insufficient documentation. Your staff calls the payer, resubmits, maybe sends additional records. Weeks pass. Sometimes the claim eventually gets paid. Sometimes it doesn’t.
The root cause isn’t bad documentation from the surgeon. It’s a disconnect between what the surgeon documents and what the payer needs to see. Medical necessity narratives for oral surgery are specific. Payers want to see certain clinical findings, certain radiographic evidence, and certain language that maps to their coverage criteria.
Most in-house billers don’t write medical necessity narratives. They submit what the surgeon gives them and hope it’s enough. Specialty billing teams build the narrative into the submission, matching the surgeon’s clinical findings to the payer’s specific requirements before the claim ever goes out.
The denial spiral
When a claim gets denied, someone on your team has to work it. They review the denial reason, gather additional documentation, write an appeal, and resubmit. This process takes time, and for complex OMS claims, it can take a lot of time.
Here’s what most practices don’t track: the true cost of a denial. It’s not just the delayed revenue. It’s the staff hours spent on rework. It’s the opportunity cost of those hours not being spent on new claims. It’s the percentage of denied claims that never get resubmitted because the staff got busy with other things and the filing deadline passed.
Industry data puts the average cost of reworking a denied claim at $25-30 per claim. For practices with denial rates above 10%, that rework cost alone can run $50,000+ annually. And that’s before you count the claims that fall through the cracks entirely.
The better approach is to prevent denials before they happen. Clean claim rates above 94% are achievable for OMS practices, but only if the billing team knows exactly what each payer requires for each procedure type before the claim is submitted.
Aging AR that nobody’s chasing
Pull your AR aging report right now. How much is sitting in the 90+ day bucket? For most OMS practices with in-house billing, the answer is uncomfortably high.
Aging AR accumulates for two reasons. First, denied claims don’t get reworked quickly enough (or at all). Second, clean claims don’t get followed up on when payers are slow to pay. Both problems come down to bandwidth. Your billing team is busy submitting new claims, answering patient billing questions, posting payments, and handling the dozen other tasks that land on their desk every day. Systematic follow-up on aging claims falls to the bottom of the priority list.
The math here is straightforward. Every dollar sitting in 90+ day AR has roughly a 50% chance of ever being collected. At 120+ days, that drops below 30%. The longer a claim ages, the less likely you are to see that money. And yet most practices don’t have a structured process for working aged claims weekly.
The staffing problem underneath all of this
Every issue above gets worse when you factor in staffing. Training an OMS biller takes months. Turnover in billing roles is high. When your experienced biller leaves, institutional knowledge walks out the door with them, and you’re back to square one with someone who doesn’t know the difference between D7240 and CPT 41899.
Small billing teams also have no redundancy. One person out sick, on vacation, or between jobs means claims stop going out, denials pile up, and AR ages. You don’t see the damage in real time. You see it 60-90 days later when collections drop and you can’t figure out why.
What this actually costs
Add it all up: routing errors, missed cross-codes, documentation gaps, denial rework, aging AR, and staffing fragility. For a mid-size OMS practice doing 30-40 surgical cases per week, the total revenue leakage is typically $150,000-300,000 per year.
That’s not a billing team performance problem. It’s a structural problem. In-house teams built for general dental billing aren’t equipped to capture the full value of specialty surgical procedures. They don’t have the coding depth, the payer-specific knowledge, or the bandwidth to work every claim to completion.
The practices that close this gap are the ones that bring in billing partners who specialize in oral surgery. Not general dental billing companies. Not generic RCM providers. Teams that know OMS procedures, OMS payers, and OMS documentation requirements inside and out.
If your collections look fine on the surface, that doesn’t mean you’re capturing everything you’ve earned. It might just mean you’ve never seen what “fine” actually looks like.