At the front desk, D5120 shows up anytime a patient needs a full lower denture. It is the code insurers want to see before they approve payment, and getting it wrong is one of the fastest ways to get a claim kicked back. This post walks through what the D5120 dental code covers, what it pays, how to document it, and how it compares to the maxillary and immediate denture codes you will also see on the same patient chart. We also cover how to check that a plan will actually pay for it before the visit.
What Is the D5120 Dental Code?
D5120 is the CDT procedure code for a complete denture, mandibular. It describes a removable prosthetic device that replaces every natural tooth in the lower jaw, along with the gum tissue it rests on. A dentist uses D5120 only when the lower arch is fully edentulous, meaning no natural teeth remain there. The code covers the final denture itself: the acrylic base, the full set of replacement teeth, and the fitting appointment where the dentist adjusts the bite. It does not cover extractions, healing time, or any temporary denture worn while the gums heal after teeth are removed.
Most dental plans that include prosthodontic benefits pay toward D5120 once every five to eight years per arch, though the exact frequency limit depends on the specific plan. A front desk team billing D5120 needs a current periodontal chart, a panoramic or full mouth x-ray, and documentation that the arch is fully edentulous before the claim goes out.
What D5120 Pays and What It Covers
Payment amounts vary by plan, state, and whether the office is in network, so a single dollar figure here would not match your fee schedule anyway. What stays the same is the benefit structure. D5120 falls under major or prosthodontic services on most PPO plans, which usually pay less than preventive or basic care and often carry a waiting period for new patients. Many plans pay toward one complete denture per arch within a set number of years, so a patient who had a lower denture made under a different plan a few years back may not have a fresh benefit yet.
Check the plan's missing tooth clause too. Some plans will not pay D5120 at all if the teeth in that arch were missing before the patient's coverage started, no matter how the denture is documented.
How to Bill D5120: Steps and Documentation
Before submitting a claim for D5120, pull together:
- A current periodontal or oral exam note confirming the mandibular arch has no remaining natural teeth.
- A panoramic x-ray or full mouth series taken within the plan's required window, usually the last six to twelve months.
- A narrative, if the plan asks for one, noting the date of last extraction and whether this replaces a prior denture.
- The date of service and the arch designation on the claim form.
A pre-treatment estimate is worth the extra step. Submit one before the denture is fabricated so the practice and the patient both know the real out of pocket cost, not just the fee schedule number. The claims we see denied most often get denied for missing frequency documentation, or because the pre-treatment estimate was skipped and the plan's frequency limit had already been used by another provider.
D5120 vs Other Denture Codes
D5120 only covers the lower arch. A few related codes get mixed up with it at the front desk.
D5110 dental code is the maxillary version, the complete upper denture. We cover the differences in full in our D5110 dental code breakdown. The D5110 dental code description from the ADA is a removable prosthesis replacing all teeth and tissue in an edentulous maxillary arch. If the patient needs both arches replaced, see our guide on what a complete maxillary denture involves too.
D5130 dental code description: immediate denture, maxillary. This is the denture placed the same day the last upper teeth come out, before the gums finish healing. It is billed separately from D5120 or D5110 because it is a different device, made in advance from models and adjusted at delivery.
D5140 dental code: immediate denture, mandibular. The D5140 dental code description follows the same logic as D5130 for the lower arch: a removable denture inserted right after the remaining lower teeth are extracted, worn through healing until a final denture is made later.
The D5120 dental code description itself, straight from the CDT manual, is simple: a removable prosthesis that replaces the complete mandibular arch, fabricated after extractions and healing are complete. If a patient needs dentures on both arches at once, the claim usually carries two codes, D5110 for the top and D5120 for the bottom, each billed and tracked on its own.
Dental Procedure Codes Lookup
D5120 is one of hundreds of CDT codes, and the list changes a little every year. If your team needs a dental procedure codes lookup, our CDT procedure code guide lists current codes by number and by procedure name, so you can search by what you are billing instead of guessing. For a full list of dental codes 2026, that page is the one worth bookmarking at the front desk.
How We Check D5120 Coverage Before the Visit
A denture case is expensive enough that nobody wants a coverage surprise at delivery. Insurance verification on its own works like this: sign in and check any patient in one click, in under a second, pulling the plan's frequency limit, missing tooth clause, and waiting period before you schedule the final appointment. Nothing runs on a schedule by itself here. You run the check when you need it, and plans start from $49 a month per location, priced by how many checks your office runs each month, plus $2.50 or less per check we find. For a closer look at the workflow, see our guide on automated dental insurance verification.
Inside the Full System, a D5120 check is part of one monthly plan, together with the calls, texts and emails. The ADA Health Policy Institute's 2026 survey found that 43.3% of dentists already use AI for at least one task, and insurance verification is the number two planned use, at 32.6% planned against 13.6% currently in use. A denture claim built on an outdated frequency check is one of the more expensive places for that gap to show up, since the fee runs well above a cleaning or a filling.
If you want to see a D5120 check before you commit to anything, book a short walkthrough and we will show you one on a sample patient.
FAQ
What code is D5120?
D5120 is the CDT code for a complete denture, mandibular. It covers the full removable denture that replaces every tooth in the lower arch once no natural teeth remain there. It does not include extractions or a temporary immediate denture worn while the gums heal.
Why can't you sleep with partial dentures?
This is a clinical question, and the right answer depends on the patient's bite, gum health, and the specific device. Many dentists recommend removing any denture at night so the tissue underneath can rest, but the patient should ask the treating dentist for guidance specific to their mouth. A front desk team should route this question to the dentist rather than answer it directly.
What is a complete mandibular denture?
A complete mandibular denture is a removable prosthetic that replaces every tooth in the lower jaw, resting on the gum tissue with no natural teeth left to anchor to. It is billed under the D5120 dental code once the arch is fully healed and ready for the final device. Before that point, a patient may wear a temporary immediate denture instead.
What is an ADA sedative filling?
A sedative filling is a temporary restoration placed to calm an irritated tooth before a permanent filling or crown is done. It is not related to denture codes like D5120, and it is billed under a different restorative or palliative code. For the specific code and material used on a given tooth, check with the treating dentist and the practice's coding reference.
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