Night guard codes: choosing between D9944, D9945, D9946 and D7880
Three of these codes describe an appliance. The fourth describes a diagnosis, and it is the one that decides whether the claim belongs to dental or to medical at all.
Occlusal guards look like a simple line item and are one of the more reliably mishandled claims in general practice. The appliance that comes back from the laboratory may be physically identical across three different billing situations, and the correct code is set by why it was made, not by what it is.
Ask what the appliance is treating before choosing a code
Everything downstream follows from this, and it is a clinical question with a billing consequence rather than a billing question.
- An appliance made to protect teeth from bruxism and attrition is an occlusal guard, and it is billed in the D994x range as a dental benefit.
- An appliance made to treat a temporomandibular disorder is an occlusal orthotic. D7880 sits in the oral surgery series, not the adjunctive series, and frequently belongs to medical rather than dental.
- An appliance made to treat obstructive sleep apnoea is not a CDT claim at all. It is a medical device billed to medical under a HCPCS code, and submitting it as a night guard is the error that gets the whole case paid at a fraction of its value.
D9944, D9945 and D9946 are a material and arch decision
These three replaced the single older occlusal guard code, and the split is mechanical: the material of the appliance and whether it covers the full arch or part of it.
- D9944 and D9945 are full arch, divided by whether the material is hard or soft. D9946 is partial arch.
- The laboratory prescription establishes which one applies, and it is the document to attach when a payer asks.
- Partial coverage appliances attract more scrutiny, because long-term partial coverage can cause the occlusal changes the appliance was meant to prevent. A narrative explaining why partial coverage was chosen is worth including unprompted.
Coverage is the real problem, not the code
Most occlusal guard denials are coverage denials. They were decided before the impression was taken, and they are not winnable on appeal.
- A large share of plans exclude occlusal guards outright, and others cover them only for bruxism with documented wear, excluding TMD and cosmetic grinding complaints.
- Where covered, replacement limits of three to five years are common, and the clock runs from the last guard regardless of which practice made it.
- Some plans pay guards from the basic category and some from major, which changes the patient's share substantially and is worth confirming before quoting a figure.
- Athletic mouthguards are a separate code and are almost universally excluded. They should not be billed as occlusal guards to obtain coverage.
Repairs, relines and replacements
Adjustment and repair of an existing guard has its own code and is routinely left unbilled, because the appointment is short and feels like a courtesy. Over a year of recall it is not a small number. A reline is distinct from a repair, and distinct again from remaking the appliance, which restarts the frequency clock and usually needs the original delivery date to clear.
What to attach before it is denied
- Photographs or charted findings of the wear the appliance is treating. Generalised attrition is visible and persuasive.
- The laboratory prescription, which settles material and arch coverage.
- The delivery date of any previous guard, to demonstrate the frequency limit is clear.
- For D7880, the TMD findings: joint sounds, range of motion, pain history, and the diagnosis itself.
- For a sleep apnoea appliance, the sleep study and the referring physician — and a medical claim, not a dental one.
Questions
What is the dental code for a night guard?
For a bruxism appliance it is one of D9944, D9945 or D9946, split by material and arch coverage: D9944 and D9945 are full arch hard and soft respectively, D9946 is partial arch. These replaced the older single occlusal guard code. If the appliance is treating a temporomandibular disorder rather than bruxism, the code is D7880 instead, and that often belongs to medical.
What is the difference between D9944 and D7880?
Diagnosis, not appliance. The D994x codes are occlusal guards protecting teeth from bruxism and are a dental benefit. D7880 is an occlusal orthotic treating a temporomandibular disorder, sits in the oral surgery series, and is frequently a medical benefit. The two can produce a physically similar appliance, so the record — joint findings, symptoms, diagnosis — is what justifies the code you chose.
Why was our night guard claim denied?
Most often because the plan excludes occlusal guards, or covers them only for documented bruxism, or because a previous guard falls inside a three to five year replacement limit that runs from the last appliance regardless of which practice made it. These are coverage decisions rather than documentation ones and rarely survive appeal, which is why the useful work happens at verification.
Can you bill a sleep apnoea appliance as a night guard?
No. An oral appliance for obstructive sleep apnoea is a medical device billed to medical insurance under a HCPCS code, supported by a sleep study and a physician's diagnosis. Submitting it as a dental occlusal guard both misrepresents the treatment and, in practice, collects a fraction of what the medical claim would have paid.