Soft Night Guard Dental Code (D9945): Billing Guide

What D9945 covers

D9945 reports a custom-fabricated soft occlusal guard that covers the full upper or lower arch. The material is typically thermoplastic (vacuum-formed) or ethylene-vinyl acetate (EVA). The appliance is taken from an impression or digital scan, processed at the lab or in office, and intended for nighttime wear to protect teeth from grinding and clenching.

It does not cover:

• A hard acrylic occlusal guard. Use D9944 even though the appliance shape may look similar. An appliance that is soft in one layer and hard at the biting surface belongs there too; see below.
• A soft guard covering only part of the arch. There is no exact CDT code for partial-arch soft. Code by material: report D9945 (soft, full arch) with a narrative explaining the partial coverage, or report D9999 (unspecified adjunctive procedure, by report) with full documentation when neither arch nor material matches an existing code. D9999 is the most precise option here because it misrepresents neither material nor arch. Do not use D9946. It is a hard-appliance code, and a material note does not convert a hard code into a soft one. Confirm the approach with the specific carrier.
• An athletic mouthguard. Use D9941. The material may be similar but the clinical intent is different.
• A sleep apnea appliance. Use D9947 or appropriate medical CPT.

The clinical purpose of D9945 is protective. The soft material absorbs grinding forces and creates a barrier between opposing dentition during sleep.

Work done later on a guard the patient already owns falls outside D9945. A repair or reline is D9942 and an adjustment is D9943. CDT 2026 added D9936 for cleaning and inspecting an existing guard, counted per appliance, which is the right code when the patient brings the guard in to have buildup taken off it and nothing about the fit is altered. That distinction comes up more on soft appliances than hard ones, because the porous surface holds staining and calculus sooner.

D9936 being the correct code does not make it a paid one. Carrier treatment so far runs to non-covered or bundled: Utah’s PEHP 2026 guide marks it not covered and considers it part of the original guard purchase, and Delta Dental Insurance Company’s 2026 code summary calls it not a benefit of most of its plans, leaving the fee with the patient, with a once-every-12-months limit and no billing alongside D9942 on the plans that do cover it. Bill it because it describes the visit accurately, and verify the plan before quoting the patient anything.

Soft throughout is the whole test

There is no partly-soft entry in the code set. D9945 describes an appliance that is soft from the fitting surface out to the occlusal surface, and an appliance that is soft only in one layer sits on a different code entirely.

That is the dual laminate, ordered from some labs as a hard/soft guard: a cushioned inner liner seated against the teeth under a rigid outer shell. It is soft where the patient’s fingers land, which is why it gets posted here. Published ADA guidance puts any guard combining hard and soft components on the hard codes, on the reasoning that the surface doing the therapeutic work is the one the opposing teeth meet. A liner added for comfort does not move it. Covering the full arch, that appliance is D9944. Covering part of an arch, it is D9946. Neither is a D9945.

The check is one question put to the lab prescription rather than to the appliance in your hand: what does the opposing dentition bite against? If the answer is acrylic, the code was never D9945, however soft the guard feels.

When to bill D9945

Bill D9945 when:

• The patient presents with bruxism, clenching, or grinding symptoms.
• The dentist takes an impression or digital scan for a soft occlusal guard.
• The lab fabricates (or the office vacuum-forms) the appliance from soft thermoplastic or EVA material.
• The appliance covers the full arch.
• The appliance is delivered to the patient and the fit verified.

Do not bill D9945 for:

• Hard acrylic appliances, including a laminate guard whose biting surface is hard over a soft liner. Use D9944, or D9946 if it covers only part of the arch.
• Athletic mouthguards.
• Sleep apnea appliances.
• TMD-specific treatment splints with bite adjustments.

When soft is the right clinical choice

The choice between hard (D9944) and soft (D9945) is a clinical one, but it matters for billing because some plans cover one and not the other. The general patterns:

• Heavy bruxers usually need hard. Soft material wears through quickly under heavy parafunctional forces. A heavy bruxer on a soft appliance will need replacement within months.
• Mild grinders or clenchers tolerate soft well. A patient who grinds occasionally rather than nightly, or who clenches without significant lateral grinding, often does well in a soft appliance.
• Patients who can’t tolerate hard acrylic. Some patients gag, refuse to wear, or have TMD discomfort with a hard appliance. A soft appliance is often the only one they’ll wear at all.
• Transitional use. A dentist sometimes prescribes a soft appliance first to confirm the patient will actually wear it before investing in a more durable hard appliance.
• Children and adolescents. Growing dentition often makes a long-lasting hard appliance impractical. Soft appliances replaced as the patient grows is a more realistic plan.

The dentist makes the clinical call. The biller’s job is to code what was actually fabricated.

Why D9945 sometimes denies when D9944 pays

This is the single most surprising pattern on this code. A patient has a plan that covers occlusal guards. The previous patient on the same plan got a D9944 paid. The current patient gets a D9945 denied for “not a covered benefit.”

The reason is that some carriers explicitly exclude soft appliances. The exclusion language reads as “soft thermoplastic or vinyl appliances inadequate to protect against parafunctional forces” or similar. The plan’s underwriting decided that paying for soft appliances was an unfavorable risk because they wear out faster than hard ones, generating more frequent replacement claims.

If your office has a patient on such a plan and the dentist has chosen soft for a valid clinical reason (intolerance, mild grinding, transitional), the billing path is:

1. Confirm with the carrier whether D9945 is covered. If it isn’t, present the full office fee as patient responsibility.
2. If the patient asks, explain why D9944 might pay and D9945 might not. Don’t recommend switching to a hard appliance just to get coverage. The clinical decision and the billing decision are separate.
3. Get the signed financial agreement before fabricating.

Top reasons D9945 gets denied

Four issues account for most denials:

1. Plan excludes occlusal guards entirely. Same exclusion as D9944. The plan considers occlusal guards cosmetic or non-essential, and excludes them regardless of material.
2. Plan covers hard but excludes soft. The plan-design pattern described above. Not appealable. Patient owes full fee.
3. No narrative or diagnosis on the claim. Plans that cover D9945 usually require some documentation of bruxism or TMD symptoms. Without it, the claim denies or pends.
4. Frequency limit exceeded. Patient had a previous occlusal guard within the plan’s window (3 years typical, sometimes 5). The replacement claim denies for frequency. Documentation of why the previous appliance is no longer functional can sometimes overturn this.

The documentation that gets D9945 paid

For plans that cover D9945 with documentation, the narrative needs the same three elements as D9944:

1. The complaint. Bruxism symptoms, jaw soreness, partner-reported grinding.
2. The clinical findings. Wear facets, attrition, abfraction, fractured restorations.
3. The treatment objective. Why a soft appliance was chosen. This part matters more for D9945 than for D9944.

A useful phrasing: “Patient reports nighttime grinding and morning jaw soreness. Clinical exam shows wear facets on canines #6, #11 and abfraction at cervical of #19. Soft thermoplastic full-arch occlusal guard fabricated; soft material chosen due to patient’s documented intolerance of prior hard appliance.” Specific. Defensible. Not a template.

Documentation that supports the claim

The claim needs:

• Date of service (delivery date).
• Tooth coverage (upper or lower arch).
• Narrative documenting bruxism complaint and clinical findings.
• Material indication noting soft thermoplastic or EVA (some carriers ask for material specifically).

For the patient record, document:

• Wear-pattern findings with tooth-specific notes.
• TMD symptoms if any.
• Material selected and clinical rationale for choosing soft.
• Impression date and delivery date.
• Patient instructions for cleaning, storage, and expected lifespan.
• Follow-up schedule (typical: 30-day comfort check, annual evaluation for wear).

Pre-treatment communication

Pre-treatment verification for D9945 follows the D9944 pattern with one extra step: ask the eligibility rep specifically about D9945, not just “occlusal guards.” Many reps will read coverage off a system that pays D9944 without checking whether D9945 is separately excluded. If the plan covers hard but excludes soft, the patient owes the full fee and the financial agreement should be signed before the impression.

Example case

A 38-year-old patient presents at recall. The hygienist notes mild wear facets and the patient reports occasional morning jaw soreness. The dentist examines, confirms mild parafunctional wear, and asks the patient about previous appliance experience. The patient had a hard guard five years ago, never wore it consistently, and didn’t tolerate the bulk. The dentist recommends a soft appliance as more likely to be worn nightly.

Billing steps:

1. Verify the patient’s plan benefits. The eligibility rep confirms D9944 is covered at 50%, but the rep is unsure about D9945. Ask specifically.
2. The rep checks the system and confirms D9945 is excluded as “soft appliances inadequate for parafunctional protection.”
3. Present the patient with the full office fee on the soft appliance. Explain that her plan covers hard but not soft, and ask if she still prefers soft given her tolerance history.
4. The patient confirms she wants soft and signs the financial agreement for the full office fee.
5. Take the impression. Fabricate the appliance. Deliver and verify fit.
6. Submit D9945 to the carrier with the bruxism narrative. The carrier denies as non-covered (as expected). The full fee remains patient responsibility.

The claim submission still matters even though the denial is expected. It gives the patient an EOB documenting the appliance for FSA or HSA purposes and confirms the non-coverage in writing for her records.

What to get right in your PMS

The specifics vary across Open Dental, Dentrix, Eaglesoft, Curve, and Carestream. The steps that matter:

1. Code by material, and read the whole build. D9945 is soft full arch. Hard acrylic is D9944, and so is a laminate whose occlusal surface is hard over a soft liner. The lab slip decides the code, and the line that matters on it is the occlusal material rather than the liner.
2. Post on the delivery date. Not the impression date.
3. Add the narrative noting material rationale. A line about why soft was chosen helps defend the code on any plan that questions whether soft was clinically appropriate.
4. Verify the patient is past any waiting period. Some plans treat D9945 as major with a 6-month waiting period.
5. Adjust the ledger correctly after the EOB. A non-covered denial means no write-off. A covered claim that pays at the D9945 allowable means the difference is patient responsibility per the plan’s coinsurance structure.

If your office is fabricating a high volume of soft occlusal guards on patients whose plans exclude them, the question is whether the front desk is communicating the coverage exclusion clearly before fabrication. Patients accept full-fee billing when they’ve been informed upfront. They contest it when they hear about it after the EOB.