Dental Exam Codes: D0120, D0140 and D0150 Explained

Dental exam codes are the evaluation codes at the start of the CDT diagnostic section, and three of them carry most of the volume: D0120, D0140 and D0150. D0120 is the routine recall exam for a patient of record, D0150 is the full workup for a new patient or a returning patient whose situation has changed, and D0140 is the limited exam for a specific problem or emergency. They look simple, but exam lines are denied or paid as a different code more often than many offices expect, usually because of plan frequency rules rather than the exam itself.

This article is general information, not coding advice. Choosing a code is the treating dentist’s decision, based on what was done and what the clinical record shows. We describe codes here in our own plain words; for the exact nomenclature and descriptors, use the current CDT manual published by the American Dental Association.

What are the main dental exam codes?

The evaluation codes most general offices use, described in plain words:

• D0120: the periodic exam for an established patient, checking for changes since the last full or periodic exam.
• D0140: a limited exam focused on one specific complaint, often an emergency or a toothache.
• D0150: the comprehensive exam that sets the baseline for a new patient or for an established patient in certain situations.
• D0180: a comprehensive periodontal exam for patients with signs of gum disease or certain risk factors.
• D0145: an exam for a child under three, with counseling for the caregiver.

Each code has required elements listed in the CDT manual. Some carriers state plainly that an evaluation is only a benefit when every element in its descriptor was completed, so the chart note should show those elements were done.

When is D0120 used?

D0120 is the exam that goes with most hygiene recall visits. ADA News describes it as an evaluation for a patient of record that looks for changes in oral and general health since a previous comprehensive or periodic evaluation. In billing terms, D0120 assumes the office already has a baseline exam on file.

Plans usually limit routine exams to a set number per benefit period, often two per year or one every six months. Pay attention to how the plan counts:

• Some plans count every evaluation code against one shared limit, so a D0150 in January can use up a D0120 later in the year.
• Some count by calendar year, others by rolling months from the last exam date. A recall booked one week early can be denied on a six-month plan.
• Exams at a different office still count, which is why a new patient’s last exam date at their previous dentist matters.

When is D0150 used?

According to ADA News, D0150 is meant for new patients, for established patients who have had a significant change in health, and for established patients who have been away from active treatment for three years or more. That last case surprises some offices: a long-absent patient of record can qualify for a comprehensive exam clinically.

Plans often pay D0150 less flexibly than the code allows. A 2023 Delta Dental handbook of national processing policies, for example, paid a comprehensive exam for the patient’s first encounter with the dentist or office and processed later comprehensive exams from the same office as periodic exams. So a D0150 for a returning patient may be paid at the D0120 rate even when the code was correct. When that happens, the patient’s share depends on the plan and your network contract.

For group practices and DSOs, ask how the plan defines the office. Moving a patient to another dentist in the same group, or to another location under the same tax ID, may not make them a new patient in the plan’s eyes.

When does D0140 apply?

D0140 is the limited exam for a specific problem, such as pain, swelling or a broken tooth, rather than a full review of the mouth. It is common at emergency visits and is often billed with a single periapical image.

From the billing side, keep these points in mind:

• Many plans have a separate limit for limited exams, but some count them against the same exam limit as D0120.
• Many plans will not pay two evaluations on the same date. If a recall patient mentions a new problem during the visit, the dentist decides which evaluation was actually performed; billing both rarely pays.
• Some carriers tie a limited exam to definitive treatment. The 2023 Delta Dental handbook, for instance, allowed a limited exam together with definitive treatment.

How do new and established patient rules affect exam billing?

The CDT manual describes who each exam is for in clinical terms. Plans then layer their own definitions on top, and those definitions decide payment. Before the first visit, the front desk or billing team should find out:

• When and where the patient last had an exam, and which code was paid.
• Whether the plan limits comprehensive exams to one per dentist, one per office, or one per set number of years.
• Whether the patient has used up routine exams for the benefit period.

That is the kind of history our Insurance Verification & Eligibility service pulls from carrier portals before the appointment. Our free dental insurance verification checklist lists the questions to ask.

Can dental exam codes be combined with other services on the same day?

Yes, and most exams are billed with something else, but some combinations have rules:

• Prophylaxis and bitewings. The usual recall pairing with D0120. Each has its own frequency limit.
• Full mouth debridement. ADA News notes D4355 can be reported on the same date as D0120 or D0150, but not D0180.
• Gingival inflammation scaling. Cigna’s PPO guidelines allow D4346 when it is preceded by an oral evaluation such as D0120, D0150 or D0180.
• Perio maintenance. In the 2023 Delta Dental handbook, a D0180 billed with periodontal maintenance on the same date by the same office was paid as a D0120.
• Screenings. The same handbook did not allow separate fees for a screening billed on the same date as an evaluation, and processed evaluations done without intent to treat as screenings.

The ADA’s position is that combining distinct procedures to reduce benefits is bundling, and it asks payers to make their coding rules available. That is a reason to keep each carrier’s processing policies handy rather than guessing.

Why do exam claims get denied?

1. The routine exam limit for the benefit period was already used, sometimes at another office.
2. A D0150 was billed where the plan had already paid one for that office or dentist.
3. Two evaluations were billed on the same date.
4. The recall was booked a few days short of the plan’s interval.
5. The chart note does not show the required elements of the exam.

Our Dental Claims Management team reviews exam lines against the plan history before submission, and our Denial Management & Appeals team handles the ones that come back.

How does our dental RCM team check exam codes?

Working inside Open Dental, Dentrix or Eaglesoft, we note each patient’s last exam date and code, the plan’s counting method, and any remaining routine exams on the appointment or insurance record. If a recall falls short of the interval, the office sees it before the patient arrives, so the dentist can decide what is clinically needed and the patient can be told about any cost. Exams are the first line on most claims in general dentistry and pediatric dentistry, so small errors here add up across a schedule.

Need a cleaner start to every claim?

If exam lines keep coming back paid as a different code or denied for frequency, book a free consultation. We will review how your office tracks exam history and where the gaps are.