Dental insurance billing glossary

The words on a benefits page and an explanation of benefits, in plain English: 47 terms a front desk or biller meets every day.

Updated November 11, 2026

A

Age limit: An age after which the plan stops paying for a service. Common for fluoride, sealants and orthodontics. Check the patient's age on the visit date, not today.Matters for: Sealants, Fluoride, Orthodontics
Allowed amountAlso called Allowable amount, Maximum allowable fee: The most the plan counts for a service. In network it's usually the fee in the office's contract. The plan's share is figured from this amount, not from the office's own fee.
Alternate benefitAlso called Downgrade, LEAT, Least expensive alternative treatment: A clause that pays for a service at the rate of a cheaper one that would also treat the problem. The classic case is a white filling on a back tooth paid at the silver filling rate. The patient can still have the treatment they chose; they pay the difference.Matters for: Fillings, Crowns, Implants
Annual maximumAlso called Yearly maximum, Annual max: The most the plan pays toward a patient's care in one plan year. After that, the patient pays the rest until the year starts over. For estimates, what matters is the maximum left, not the plan's total.Matters for: Crowns, Implants, Fillings
Appeal: A written request asking the insurer to reconsider a claim it denied or paid short, sent with the records that support it. The explanation of benefits says how to appeal.Matters for: Deep cleaning (scaling and root planing), Crowns
Assignment of benefits: The patient's permission for the insurer to pay the dental office directly rather than the patient.
Attachment: A document sent with a claim to support it: X-rays, photos, perio charting or a narrative. Major work and gum treatment often need one.Matters for: Crowns, Deep cleaning (scaling and root planing), X-rays

B

Balance billing: Billing the patient for the difference between the office's fee and the plan's allowed amount. An in-network office usually agrees not to do it; an out-of-network office usually can.
Basic servicesAlso called Class II, Type B: The middle coverage group. Usually fillings, simple extractions, root canals and gum treatment, often paid at 80% after the deductible. Plans don't all agree on what goes here.Matters for: Fillings, Root canals, Extractions, Deep cleaning (scaling and root planing)
Benefit yearAlso called Plan year: The 12 months the deductible and yearly maximum run over. It may be the calendar year or start on another date, such as the employer's renewal.
Birthday rule: How plans usually decide which parent's plan pays first for a child covered by both: the plan of the parent whose birthday comes first in the calendar year, by month and day only. A court order can override it.
Bundling: When the insurer folds a separately done service into another one and pays only for one, such as paying a buildup as part of the crown. The ADA opposes bundling to limit a benefit.Matters for: Crowns, Emergency visits

C

Calendar year: January 1 to December 31. A limit counted per calendar year starts over on January 1, whatever the date of the last service.
CDTAlso called Dental procedure codes, Code on Dental Procedures and Nomenclature: The code set US dental claims use, published by the American Dental Association and named the HIPAA standard for dental services. The ADA updates it every year, with changes effective January 1, and licenses it. Our common codes list describes the most-billed ones in our own words; the official wording is in the ADA's CDT manual.
Claim: The office's request to the insurer to pay for services done: who, what, when, which tooth, and the fee.
Claims historyAlso called Service history: The insurer's record of services it has been billed for this patient, at any office. It is how you check frequency limits, but it shows only what was billed to this plan.Matters for: Exams, Cleanings, Crowns
Clean claim: A claim with everything the insurer needs to process it the first time, with nothing missing or wrong. State prompt payment laws often require interest when a clean claim is paid late.
Coinsurance: The patient's percentage of the allowed amount after the deductible. If the plan pays 80%, the coinsurance is 20%.
Coordination of benefitsAlso called COB, Dual coverage: How two plans share a claim when a patient has both. The primary plan pays first; the secondary plan then pays toward what's left, usually no more than it would have paid as primary.
CopaymentAlso called Copay: A fixed dollar amount the patient pays for a service, set by the plan, instead of a percentage.
Coverage percentage: The share of the allowed amount the plan pays for a group of services, after the deductible. A common pattern is 100% preventive, 80% basic and 50% major.

D

Deductible: What the patient pays each plan year before the plan starts paying. Many plans skip it for preventive and diagnostic care. Family plans may have a family deductible too.Matters for: Fillings, Crowns
Downcoding: When the insurer pays a service under a different, lower-paying code than the one billed, such as paying a surgical extraction as a simple one.Matters for: Extractions

E

Effective date: The date the patient's coverage started. Waiting periods count from it, and the missing tooth clause looks back to it.
Eligibility: Whether the patient is covered on the date of service. Check it before every visit: a plan that ended pays nothing.
Exclusion: A service the plan doesn't pay for at all. Implants, night guards and cosmetic work are common examples.Matters for: Implants, Night guards
Explanation of benefitsAlso called EOB: The insurer's statement after a claim: what it paid for each service, what the patient owes, the reasons for any denial, and how to appeal.Matters for: Deep cleaning (scaling and root planing)

F

Fee scheduleAlso called Contracted fees: The list of fees an in-network office has agreed to accept from a plan for each service.
Frequency limitationAlso called Frequency limit: A cap on how often the plan pays for the same service: two cleanings a year, one crown per tooth every five years. Past the limit the plan pays nothing. See dental frequency limitations.Matters for: Cleanings, Exams, X-rays

I

In network: An office with a contract with the insurer. It accepts the contracted fee as payment in full, so the patient owes only their share of that fee.

L

Lifetime maximum: The most a plan will ever pay for one kind of care for one person, most often orthodontics. Once used, it doesn't come back.Matters for: Orthodontics
Limitation: A condition on when the plan pays: an age limit, a frequency limit, a waiting period or a rule about which teeth qualify.

M

Major servicesAlso called Class III, Type C: The highest-cost coverage group. Usually crowns, bridges, dentures and implants, and on some plans oral surgery, often paid at 50%.Matters for: Crowns, Bridges, Implants, Dentures
Missing tooth clause: A rule that the plan won't pay to replace a tooth lost before the coverage started. It affects bridges, implants and dentures. See the missing tooth clause article.Matters for: Bridges, Implants, Dentures

N

Narrative: A short note on the claim explaining why the treatment was needed and what was done, for what an X-ray can't show.Matters for: Crowns, Deep cleaning (scaling and root planing), Night guards
Nonduplication of benefits: A way a secondary plan figures its payment: it works out what it would have paid as primary and subtracts what the primary plan paid. If both plans pay 80%, the secondary usually pays nothing more.

O

Out of network: An office with no contract with the insurer. The plan pays its share of its own allowed amount, and the patient can owe the gap up to the office's fee as well.

P

Patient portion: What the patient owes after insurance: the fee billed minus what the plan pays. See how to calculate a dental patient portion, or try the patient portion calculator.
PredeterminationAlso called Pre-treatment estimate, Pre-estimate: A claim sent before treatment, asking the insurer what it would pay. It isn't a promise, but it's the surest answer for large cases.Matters for: Crowns, Bridges, Implants, Orthodontics
Preventive and diagnostic servicesAlso called Class I, Type A: The group that usually includes exams, cleanings, X-rays, fluoride and sealants. Often paid at 100% and without the deductible.Matters for: Exams, Cleanings, X-rays
Primary and secondary insurance: When a patient has two plans, the primary pays first and the secondary pays after, toward what's left.

Q

Quadrant: A quarter of the mouth: upper right, upper left, lower left or lower right. Gum treatment is billed by quadrant.Matters for: Deep cleaning (scaling and root planing)

S

Subscriber: The person who holds the plan, usually the employee. A spouse or child on the plan is a dependent. Claims need the subscriber's details as well as the patient's.

T

Tooth numbers: US dental claims use the Universal system: 1 to 32 for adult teeth, starting at the upper right back molar, and A to T for baby teeth.

U

UCR feeAlso called Usual, customary and reasonable: A plan's own figure for a normal fee for a service in an area. Out of network, the plan often pays its share of this figure rather than the office's fee.

W

Waiting period: Time after the plan starts before it pays for some services, usually basic or major work. Work done before it ends is paid by the patient.Matters for: Root canals, Crowns, Implants
Write-off: The part of the office's fee it agrees not to collect, such as the difference between its own fee and an in-network contracted fee.

These are the usual meanings. A plan's own documents define its terms, and they can differ.

Sources

Read November 11, 2026. Where a source describes one insurer's plans, we say so.

Get the patient's share in dollars, from the benefits page

Every term here changes the patient's share. Tabruns reads the coverage, deductible, yearly maximum, waiting periods and frequency limits from the insurer's portal and works out what the patient owes. Patient details stay on the office computer.

Start 7-day free trial 7 days free · Card at checkout · Cancel anytime

Not ready? Try the free patient portion calculator.