The Dental Code for an Occlusal Guard: A Lab Reference

Before we get into the codes, a quick orientation. The appliance type drives the code, and the appliance type is set by the prescription you send to the lab. If you need a refresher on the appliances themselves rather than the billing, start with our overview of night guards and splints.

Why the Code Follows the Appliance, Not the Other Way Round

The CDT occlusal guard codes are deliberately specific. They separate appliances by material (hard or soft) and by coverage (full arch or partial arch). That specificity is the point: the ADA introduced the split so a correctly chosen code carries enough information on its own, without a supporting narrative attached to every claim.

For the lab this matters because the code is decided by what you prescribe, not by what the front desk picks afterwards. If you order a hard full arch device and the claim goes out as soft, the two do not agree, and a mismatch like that is an easy denial. Set the appliance type on the prescription and the code follows.

Throughout this guide, CDT codes are the US billing reference. The UK equivalents and the NHS position are covered in their own section below.

D9944, D9945 and D9946: The Three Core Codes

Three codes do most of the work for new occlusal guards. They are split by material and arch coverage, and each describes a single full appliance we fabricate and you deliver.

• D9944: occlusal guard, hard appliance, full arch. A rigid acrylic device covering a complete arch, maxillary or mandibular. This is the standard bruxism night guard and the most commonly prescribed of the three.
• D9945: occlusal guard, soft appliance, full arch. A flexible thermoplastic device over a complete arch, used where a softer feel is wanted, often for lighter clenchers or shorter term wear.
• D9946: occlusal guard, hard appliance, partial arch. A rigid device covering only part of an arch, such as an anterior deprogrammer style appliance rather than full coverage.

Note what is not in this list: there is no soft partial arch code. If the prescription calls for partial coverage, it is reported as hard under D9946. Tell us the coverage you want and we fabricate to match the code you will bill.

Dual Laminate and Hard Soft Combinations

A dual laminate guard has a soft inner surface against the teeth and a hard outer shell. It is a common request because it pairs comfort on seating with durability on the occlusal surface. The coding question it raises is which of the two materials decides the code.

The ADA position is clear: an appliance with both hard and soft components is documented and reported as a hard appliance. So a full arch dual laminate guard is reported under D9944, not D9945. The hard component governs.

If you want the design and material logic behind soft, hard and dual laminate options before you prescribe, see our comparison of soft versus hard night guards.

When you send us a dual laminate case, name it as such on the prescription. We build the laminate, you bill it as hard, and the claim reflects the appliance accurately.

Adjustment, Repair and Maintenance Codes

New fabrication is only part of the lifecycle. Several CDT codes cover what happens to a guard after delivery, and these are easy to overlook on the claim.

• D9943: occlusal guard adjustment. Used when an existing guard is adjusted, for example refining the occlusion at a follow up rather than remaking the appliance.
• D9942: repair and reline of an occlusal guard. Used where an existing device is repaired or relined rather than replaced. Many of these are lab procedures we can carry out on a returned appliance.
• D9936: cleaning and inspection of an occlusal guard, per appliance. A maintenance code for in office cleaning and inspection of a guard already in service.

These codes keep a returned or maintained appliance out of the new fabrication codes, which is where overbilling questions tend to come from. Match the procedure to what was actually done.

Occlusal Guard Versus TMD Appliance: A Coding Line Not to Cross

This is the distinction payers scrutinise most. An occlusal guard protects teeth from the forces of bruxism and clenching. An appliance whose purpose is to treat a temporomandibular disorder is a different device with a different intent, and the codes are not interchangeable.

Appliances to treat TMD are reported under D7880, occlusal orthotic device, by report, not under the D994x occlusal guard codes. Choosing a guard code for what is clinically a TMD appliance, or the reverse, is a documentation problem before it is a billing one.

The dividing line is clinical intent, recorded in the notes. The lab fabricates to the design you specify; the code reflects the purpose you have documented.

Legacy and By Report Codes You Will Still See

Some older references and glossaries still list D9940, occlusal guard, by report. It predates the hard and soft split and is why you will occasionally find conflicting code lists online. For current appliances, the specific D9944 to D9946 codes are what carry the material and coverage detail, which is exactly why the ADA introduced them.

If you inherit a treatment plan or a payer policy that references D9940, treat it as a prompt to confirm the appliance type and move to the specific code that matches what we are actually fabricating. The more specific the code, the less narrative the claim needs.

UK Equivalents and the NHS Position

CDT codes are a US system. UK practices do not bill occlusal guards on D codes, so the value of this reference here is shared vocabulary, not the billing pathway. When a US trained associate, an insurer or a coding tool says D9944, you can map it straight to the appliance on the bench.

• Private treatment: in UK private practice an occlusal guard or bite splint is charged as a private item per your own fee schedule, not against a CDT code. The appliance specification is what we work from either way.
• NHS context: on the NHS in England, treatment is delivered within banded charges rather than itemised device codes, so there is no direct D9944 equivalent on an NHS claim.
• Shared language: the practical use of the US codes here is precision. Hard full arch, soft full arch and hard partial arch describe the appliance regardless of which side of the Atlantic is billing it.

If you have a named design in mind rather than a generic hard or soft guard, our reference on named splint designs lines the recognised splint designs up against what each one does.

Sending an Occlusal Guard Case to Flora

The cleaner your prescription, the cleaner your claim, because the appliance you specify is the appliance the code describes. For every guard case, give us the material (hard, soft or dual laminate), the coverage (full arch or partial), and the arch (maxillary or mandibular). That is the same information the code carries, so the two stay in step from bench to billing.

• Scans: we accept intraoral scans from 3Shape, Medit, iTero and Dexis, or conventional impressions if you prefer to work analogue.
• Turnaround: occlusal guards run on a comparable timeline to our crown and bridge work, around ten working days, so you can plan the fit appointment with confidence.
• Accreditation: Flora is DAMAS and DLA accredited and GDC registered, so the appliance arrives to a documented standard.

If you have not worked with us before, your first occlusal guard case is free, up to £100, with no invoice and no contract. Send the prescription, see the fit and the finish, then decide.