Dental Billing Glossary

The 270 is an electronic request sent to an insurance payer to check a patient's eligibility and benefits. The 271 is the payer's response, confirming coverage details such as deductible status, maximums remaining, and frequency limitations. These transactions happen in real time through EDI connections.

The 276 is an electronic inquiry sent to a payer to check the status of a previously submitted claim. The 277 is the payer's response, providing the current adjudication status. These are used to track claims without calling payer phone lines.

The 835 is the electronic version of a paper Explanation of Benefits (EOB). It contains payment information from the payer, including what was paid, adjusted, or denied for each claim line. Your clearinghouse or billing software uses this file to post payments automatically.

The 837D is the standard electronic format for submitting dental claims to insurance payers. It contains all claim information including patient demographics, CDT codes, tooth numbers, provider details, and supporting documentation references.

Adjudication is the process an insurance company uses to review a submitted claim and decide how much to pay. During adjudication, the payer checks eligibility, verifies the procedure, applies plan rules, and calculates the payment or denial. This process can take anywhere from a few days to several weeks.

An aging report shows outstanding claims organized by how long they've been unpaid, typically grouped into 0–30, 31–60, 61–90, and 90+ day buckets. It's one of the most important reports for tracking revenue cycle health and identifying claims that need follow-up before they pass timely filing deadlines.

The annual maximum is the total dollar amount an insurance plan will pay toward a patient's dental care within a single benefit period (usually a calendar year). Once the maximum is reached, the patient is responsible for 100% of remaining costs. Most PPO plans have annual maximums between $1,000 and $2,500.

Assignment of benefits (AOB) is a signed authorization from the patient that directs the insurance company to send payment directly to the dental provider instead of to the patient. Without an AOB on file, the payer sends the check to the patient and your office has to collect from them.

An attachment is supporting documentation sent with or after a claim to justify the treatment performed. Common attachments include X-rays, perio charts, clinical photos, and narratives. Payers frequently request attachments for crowns, implants, and periodontal procedures.

Balance billing occurs when a provider charges a patient for the difference between the provider's full fee and the amount the insurance company allows. In-network providers typically cannot balance bill patients beyond the contracted rate. Out-of-network providers may balance bill depending on state law and plan type.

The benefit period is the timeframe during which an insurance plan's benefits are available. Most dental plans use a calendar year (January–December), but some use a plan year that starts on the employer's renewal date. Deductibles, maximums, and frequency limitations all reset at the start of a new benefit period.

Bundling is when a payer groups two or more procedures together and pays them as a single, lower-cost procedure. For example, a payer might bundle a core buildup into the crown fee, paying only for the crown. Understanding bundling rules is critical for accurate treatment planning and avoiding unexpected write-offs.

CDT (Current Dental Terminology) codes are the standardized set of procedure codes used to describe dental treatments on insurance claims. Maintained by the American Dental Association, CDT codes are updated annually. Each code starts with “D” followed by four digits (e.g., D2740 for a porcelain crown).

Claim scrubbing is the process of checking a claim for errors, missing information, and payer-specific rule violations before submitting it. Effective scrubbing catches issues like invalid CDT codes, missing tooth numbers, and frequency limitation conflicts that would otherwise result in a denial.

A clean claim is one that is submitted with all required information filled in correctly, following payer-specific formatting rules, and containing no errors or omissions. Clean claims are processed faster and paid on the first submission. The industry benchmark for a healthy clean claim rate is 95% or higher.

Coordination of benefits is the process used to determine which insurance plan pays first (primary) and which pays second (secondary) when a patient has coverage under two or more dental plans. COB rules prevent double payment and determine the order of liability between payers.

Coinsurance is the percentage of the allowed amount that the patient is responsible for after meeting their deductible. For example, if a plan covers basic procedures at 80%, the patient's coinsurance is 20%. Coinsurance rates typically vary by procedure category: preventive (100%), basic (80%), and major (50%).

A copayment (copay) is a fixed dollar amount a patient pays at the time of service for a specific type of visit or procedure. While more common in medical insurance, some dental HMO/DMO plans use copays instead of coinsurance. The amount is set by the plan and doesn't change based on the provider's fee.

A deductible is the dollar amount a patient must pay out of pocket before the insurance plan begins covering costs. Most dental plans have individual deductibles between $25 and $100 per year. Preventive services are often exempt from the deductible, while basic and major services are subject to it.

A denial occurs when an insurance payer refuses to pay a submitted claim. Denials can be caused by eligibility issues, missing information, coding errors, frequency limitation violations, or lack of medical necessity. Each denial includes a reason code, and most can be appealed within a payer-specific timeframe.

Downcoding is when a payer changes the procedure code on a claim to a less expensive alternative before processing payment. For example, a payer might downcode a porcelain crown (D2740) to a base metal crown (D2751), paying the lower fee. Downcoding is one of the most common and frustrating forms of underpayment in dental billing.

EDI is the standardized electronic exchange of business documents between healthcare providers, payers, and clearinghouses. In dental billing, EDI transactions include claim submissions (837D), eligibility checks (270/271), claim status inquiries (276/277), and payment remittances (835). EDI replaced paper-based workflows and is the backbone of modern billing.

Eligibility refers to whether a patient currently has active dental insurance coverage and what benefits are available under their plan. Verifying eligibility before treatment prevents denied claims due to lapsed or terminated coverage. Eligibility checks should confirm active status, benefit levels, deductible status, and any waiting periods.

An EOB is a document from the insurance company that explains how a claim was processed. It shows the billed amount, the allowed amount, what the plan paid, and what the patient owes. EOBs are sent to both the patient and the provider. The electronic version is called an ERA (835).

An ERA is the electronic version of an EOB. It's delivered as an 835 file and contains detailed payment information including paid amounts, adjustment reason codes, and remark codes for every claim line. ERAs enable automated payment posting and reduce manual data entry errors.

An exclusion is a procedure or service that a dental insurance plan explicitly does not cover. Common exclusions include cosmetic procedures (veneers, whitening), implants (on some plans), and services already covered under medical insurance (TMJ treatment). Exclusions are listed in the plan's Summary of Benefits document.

A fee schedule is the list of maximum allowable amounts a payer will reimburse for each procedure code. In-network providers agree to accept the fee schedule amounts as payment in full. Fee schedules vary widely between payers and plans, and negotiating higher fees is one of the most impactful things a practice can do for revenue.

A frequency limitation is a rule set by the insurance plan that restricts how often a specific procedure will be covered. For example, most plans cover two prophylaxis (cleanings) per benefit year, and bitewing X-rays once every 12 months. Submitting a claim that violates a frequency limitation will result in a denial.

HIPAA (Health Insurance Portability and Accountability Act) is the federal law that sets standards for protecting patient health information. In dental billing, HIPAA governs how practices store, transmit, and share patient data, including electronic claims and eligibility transactions. All billing software and clearinghouses must be HIPAA compliant.

ICD-10 (International Classification of Diseases, 10th Revision) codes are medical diagnosis codes sometimes required on dental claims. While dental claims primarily use CDT procedure codes, ICD-10 codes may be required for medical-dental crossover claims, TMJ treatment, or when billing medical insurance for dental procedures.

An in-network provider has a contract with a specific insurance company or plan to provide services at pre-negotiated rates (the fee schedule). Patients typically pay less when seeing in-network providers because the provider has agreed to accept lower fees. The provider cannot balance bill the patient beyond the contracted amount.

A limitation is a condition or restriction placed on coverage by the insurance plan. Unlike exclusions (which are never covered), limitations define when and how a procedure is covered. Examples include age limitations (sealants only for patients under 16), frequency limitations, and waiting periods for major procedures.

A missing tooth clause is a plan provision that excludes coverage for replacing a tooth that was already missing before the patient's coverage became effective. If a patient lost a tooth in 2020 and their insurance started in 2023, the plan may deny a bridge or implant to replace that tooth. This is one of the most commonly overlooked plan restrictions.

A modifier is a two-character code added to a CDT procedure code to provide additional information about the service. In dental billing, modifiers are less common than in medical billing, but they may be used to indicate unusual circumstances, such as treatment performed under general anesthesia or services provided by a specialist.

An NPI is a unique 10-digit identification number assigned to every healthcare provider by CMS (Centers for Medicare and Medicaid Services). NPIs are required on all electronic claims. There are two types: Type 1 (individual provider) and Type 2 (organization). Every dentist and dental practice needs an NPI to bill insurance.

An out-of-network provider does not have a contract with a patient's insurance plan. Patients typically pay more when seeing out-of-network providers because reimbursement is based on UCR fees rather than negotiated rates. The patient may be responsible for the difference between the provider's charge and the plan's allowed amount.

A payer ID is a unique identifier assigned to each insurance company or plan used for electronic claim routing. When submitting claims electronically through a clearinghouse, the correct payer ID ensures the claim reaches the right insurance company. Using the wrong payer ID is a common cause of claim rejection.

Pre-authorization (also called prior authorization or preauthorization) is a request submitted to the insurance company before performing a procedure to confirm that it will be covered. While pre-authorization is not a guarantee of payment, it gives the practice a good estimate of what the plan will pay and reduces surprise denials.

In dental insurance, a preexisting condition refers to a dental issue that existed before the patient's coverage start date. Some plans exclude or limit coverage for treating preexisting conditions, most commonly through missing tooth clauses or waiting periods for major procedures.

Primary insurance is the plan that pays first when a patient has coverage under multiple dental insurance policies. Coordination of benefits rules determine which plan is primary. For dependent children, the “birthday rule” typically makes the parent whose birthday falls earlier in the calendar year the primary plan holder.

In dental billing, a provider is the dentist or dental professional who performs and bills for the treatment. The billing provider (the practice) and the rendering provider (the individual dentist) may be different entities on a claim. Each must have a valid NPI, and the rendering provider's credentials affect how payers process the claim.

A remark code is a standardized code included on an ERA or EOB that provides additional explanation about how a claim was processed. There are two types: Claim Adjustment Reason Codes (CARCs) explain why a payment was adjusted, and Remittance Advice Remark Codes (RARCs) provide supplemental information. Understanding remark codes is essential for accurate payment posting and denial management.

Secondary insurance is the plan that pays after the primary insurance has processed a claim. The secondary plan typically covers some or all of the patient's remaining balance, depending on its COB provisions. Claims must be submitted to the primary insurer first, and the primary EOB/ERA is often required when submitting to the secondary.

The subscriber is the person who holds the dental insurance policy. This may or may not be the patient. For example, a child may be the patient while the parent is the subscriber. The subscriber's information (name, date of birth, employer, member ID) must appear on every claim, even when the patient is a dependent.

A superbill is an itemized form used to capture all procedures performed during a patient visit. It includes the date of service, CDT codes, tooth numbers, provider information, and diagnosis codes. In dental practices, the superbill bridges the gap between clinical charting and billing by giving the billing team everything needed to generate a claim.

Timely filing is the deadline by which a claim must be submitted to the payer after the date of service. Each payer sets its own timely filing limit, ranging from 90 days to over a year. If a claim isn't submitted within the timely filing window, the payer will deny it and the practice cannot bill the patient, resulting in a complete write-off.

UCR refers to the fee methodology many payers use to determine the maximum amount they will reimburse for out-of-network services. "Usual" is the provider's standard fee, "Customary" is the typical fee in the geographic area, and "Reasonable" accounts for complexity. UCR databases are often outdated and controversial because they frequently undervalue dental services.

A waiting period is the amount of time a patient must be enrolled in a dental plan before coverage begins for certain procedure categories. Waiting periods are most common for basic procedures (3–6 months) and major procedures (6–12 months). Preventive services usually have no waiting period. Submitting a claim during a waiting period will result in a denial.

A write-off is the portion of a provider's fee that is not collectible, either because it exceeds the insurance plan's allowed amount (contractual write-off) or because the practice decides not to collect from the patient. In-network providers routinely write off the difference between their fee and the contracted rate. Understanding write-offs is critical for accurate revenue tracking.