The short answer
A dental treatment plan lists each proposed procedure by tooth number, the tooth surfaces involved, a CDT procedure code, a fee, and often an insurance estimate. Adult teeth are numbered 1 to 32 under the Universal system used in the United States. The fee column is the office's charge; the insurance column is an estimate until your plan processes the claim. Ask which items are urgent, which can wait, and what each code means.
General information, not a diagnosis. Your dentist will examine your mouth before recommending treatment.
What you are looking at
After an exam, you were handed a sheet with tooth numbers, letters, codes that start with D, and a column of fees. It looks like a bill. It is not; it is a proposal. A treatment plan lists what your dentist found and recommends, and nothing on it happens until you agree.
Before you sign anything, the ADA's consent guidance says you should hear what problems were observed, what the proposed treatment is, its benefits and risks, the alternatives, and what may happen if you do not treat. The plan is the written version of that conversation. If any line is unclear, ask your dentist to explain it step by step, and take notes.
The columns vary by office, but most plans include a tooth number, the surfaces involved, a procedure code, a description, the office fee, and an estimated insurance portion. The rest of this guide takes those one at a time.
Tooth numbers: the Universal system
Dentists in the United States label teeth with the Universal Numbering System, which the ADA accepts and approves. Adult teeth are numbered 1 to 32. Number 1 is the upper right third molar, the wisdom tooth. The numbers run across the upper arch to 16, the upper left third molar, then drop to 17, the lower left third molar, and run across the lower arch to 32, the lower right third molar.
A few landmarks help: 8 and 9 are the two upper front teeth, 24 and 25 are the two lower front teeth, 3 and 14 are the upper first molars, and 19 and 30 are the lower first molars. Baby teeth use letters A to T instead, starting at the upper right. If a wisdom tooth was removed, its number is simply skipped.
If you see a number you do not recognize, ask to see the tooth on your X-ray. Being shown the spot is the fastest way to understand a plan. A checkup with X-rays is where the numbers come from.
Surfaces: the letters after the tooth number
Each tooth has sides, and fillings are described by which sides they cover. The ADA claim form uses single letters: M (mesial, the side toward the middle of your mouth), D (distal, the side away from the middle), O (occlusal, the chewing surface of a back tooth), I (incisal, the biting edge of a front tooth), B (buccal, toward the cheek), F (facial or labial, toward the lips), and L (lingual, toward the tongue).
So a line that reads 19 MO means a filling on the lower left first molar covering the side toward the front and the chewing surface. The number of surfaces often changes the procedure code and the fee, because a three-surface filling is a bigger repair than a one-surface filling. When many surfaces are involved, a crown may be suggested instead. Composite fillings describes what the practice places.
| Column | What it means | Example | Ask |
|---|---|---|---|
| Tooth number | Which tooth, numbered 1 to 32; A to T for baby teeth | 30 is the lower right first molar | Can you show me this tooth on the X-ray? |
| Surface | Which sides of the tooth the work covers | MO: the side toward the front plus the chewing surface | Why this many surfaces? |
| Code | The CDT procedure code, a D plus four digits | D0120 is a periodic oral evaluation | What does this code mean in plain words? |
| Fee | The office's charge for that procedure | Listed per line | Does this include the temporary and follow-up visits? |
| Est. insurance | What your plan may pay, based on your benefits as understood today | Changes if your maximum is used elsewhere | Was a pre-treatment estimate sent to my plan? |
| Est. your portion | The fee minus the estimated insurance payment | An estimate until the claim is processed | What could make this go up? |
| Phase or priority | The order your dentist suggests | Phase 1: pain and infection; Phase 2: fillings and crowns | Which items can safely wait? |
Procedure codes: what the D-numbers mean
The code on each line comes from the Code on Dental Procedures and Nomenclature, known as CDT. The ADA publishes and maintains it, updates it every year, and it is the HIPAA standard for reporting dental procedures. Every code is a D followed by four digits, and every code has an official name, called its nomenclature.
A few you may see: D0120 is a periodic oral evaluation, the regular checkup exam; D0150 is a comprehensive oral evaluation for a new patient or a returning one whose needs have changed; D0180 is a comprehensive periodontal evaluation. The first digit after the D groups codes by type. D2394, for example, is a tooth-colored filling covering four or more surfaces of a back tooth, D5110 is an upper complete denture, and D5730 is a chairside reline of an upper complete denture.
You do not need to memorize codes. Ask for the plain-language name of any code, and ask why that code rather than a similar one. Insurers process claims by code, so the code on the plan is what your plan will be asked to cover.
Phases: what comes first and why
Larger plans are often grouped into phases. Many offices order work the same way: anything causing pain or infection first, then control of active disease such as decay and gum disease, then rebuilding with crowns, bridges, or dentures, and cosmetic work last.
That order is not about money. Crowns and bridges placed over untreated gum disease or decay tend not to last, so the foundation comes first. If your plan has no phases marked, ask which items are urgent, which can wait, and what the risk of waiting is for each. Questions to ask before a crown, veneer, or root canal has a checklist for the bigger lines.
Estimate vs. final: why the numbers can move
The fee column is the office's charge for each procedure. The insurance column is an estimate of what your plan may pay, based on what the office knows about your benefits today. Your estimated portion is the difference. Three things can move it.
For larger items, many plans offer a pre-treatment estimate, sometimes called a predetermination: the office sends the plan to the insurer, which reports eligibility, covered services, and expected payment before treatment. The ADA notes it is not a promise of payment, because eligibility and remaining benefits can change by the time the claim is filed. It is still the most reliable number you can get in advance.
The practice accepts all PPO plans, does not accept Medi-Cal or Denti-Cal, and will work with you to identify a payment solution if your plan does not cover everything. See dental insurance and payment, and call (818) 541-1110 to verify your coverage. What drives the cost of dental work explains why one line costs more than another.
- Findings during treatment. Decay can be deeper than an X-ray showed, turning a filling into a crown or adding a root canal. Ask the office to tell you before the plan changes.
- Your plan's rules. Many PPO plans have an annual maximum, a deductible, and a percentage they pay for each category. Some apply an alternate benefit clause, paying toward the least expensive accepted treatment, with you paying the difference. Check your plan documents.
- Timing. If other claims use up your remaining benefit before this work is done, the plan pays less. Many plans run on a calendar year, so unused benefits may not carry over.
Questions to ask before you sign
You can ask for the plan on paper or by email and take time with it. When you are ready, book a visit or call.
- Can you show me each tooth on the X-ray and explain what you found?
- Which items are urgent, which can wait, and what happens if I wait?
- What are the alternatives for each line, including doing nothing for now?
- What does each code mean in plain words, and what does the fee include, such as a temporary, follow-ups, or adjustments?
- Can a pre-treatment estimate be sent to my plan for the larger items?
- Can I have a copy of the plan to take home?