Exam codes: comprehensive, periodic, limited and periodontal
Evaluations open nearly every claim in the practice, and they are the codes most often chosen out of habit. Two of them are routinely under-billed, and one is billed for patients who are not eligible for it.
The exam is where a claim begins, which gives errors here unusual reach: a mis-chosen evaluation can bring down the imaging and the treatment billed alongside it on the same date.
New, or not new — and plans define it differently from you
The comprehensive evaluation is for a patient who is new to the practice, or who is returning after an extended absence. Both halves of that matter.
- Plans commonly treat a comprehensive evaluation as payable once every three to five years per practice, regardless of whether the patient feels new.
- A patient returning after several years away may genuinely qualify again, and practices frequently default to the periodic evaluation and underbill a full workup they actually performed.
- A patient who has seen a different dentist within the same practice is usually still the same patient to the plan.
- Billing a comprehensive evaluation at every recall is one of the more recognisable patterns in claim review.
D0150 and D0180 are not interchangeable
Both are comprehensive, and the second is specifically a comprehensive periodontal evaluation. The difference is not thoroughness; it is what the examination was directed at and what the record contains.
- A comprehensive periodontal evaluation carries an expectation of full periodontal charting — probing depths throughout, recession, mobility, furcation findings.
- It is intended for patients showing signs of periodontal disease or carrying risk factors for it, not as an upgraded routine exam.
- Submitted without charting to support it, it is both unpersuasive on review and difficult to defend.
- Where the patient genuinely has periodontal involvement, this is the better-matched code and the one that sets up periodontal therapy coherently.
The limited evaluation is the most under-billed code here
A patient presenting with a specific problem — pain, swelling, a fractured tooth, a lost restoration — receives a problem-focused evaluation, and it is a separate, billable service. It is routinely absorbed into the appointment and never submitted, particularly when the practice then performs the treatment on the same visit.
- It is distinct from the periodic evaluation and is not constrained by the recall frequency.
- A patient already seen for recall earlier in the period can still receive a limited evaluation for a new problem.
- The note needs to show the problem that prompted the visit and the findings relating to it, which is a low bar that is often simply not written down.
- Where it accompanies palliative treatment, the two sit together and that relationship is covered under palliative and emergency codes.
Detailed and extensive evaluation
A problem-focused evaluation of greater scope exists for situations requiring extended assessment — complex facial pain, significant trauma, a pathology question spanning several areas. It is not a busier version of the limited evaluation, and using it that way is conspicuous.
What to attach before it is denied
- The date of the patient's last comprehensive evaluation at this practice.
- Full periodontal charting wherever a comprehensive periodontal evaluation is billed, dated on or before the claim.
- For a limited evaluation, a note naming the presenting problem in the patient's terms and the findings.
- The clinical reason for a second comprehensive evaluation inside the usual interval, where that applies.
- Nothing more for a routine periodic evaluation. It is the simplest claim in the practice and should stay that way.
Questions
What is the difference between D0120 and D0150?
D0120 is the periodic evaluation — the routine recall examination of an established patient. D0150 is the comprehensive evaluation, for a patient new to the practice or returning after an extended absence, and it covers a full assessment of the dentition and supporting structures. Plans generally allow a comprehensive evaluation once every three to five years per practice, so billing it at every recall is both incorrect and visible.
When should you use D0180 instead of D0150?
When the examination was directed at periodontal status — a patient showing signs of periodontal disease or carrying risk factors for it. D0180 carries an expectation of full periodontal charting in the record, and without that it is difficult to support on review. It is not simply a more thorough version of D0150, and choosing it for a periodontally healthy patient is not what it describes.
Can you bill an exam when a patient comes in with a toothache?
Yes, and it is frequently not billed at all. A problem-focused evaluation is a distinct service, it is not limited by the recall frequency, and a patient who has already had their periodic evaluation this period can still receive one for a new problem. The note needs to record the presenting complaint and the related findings, which is a modest requirement that is simply often skipped.
How often will insurance pay for a comprehensive exam?
Typically once every three to five years per practice, which is independent of how new the patient feels to you. A patient returning after a long absence may well qualify again, and practices often default to the periodic evaluation in that situation and underbill the full workup they actually carried out. The patient's history with your practice, not their history with dentistry, is what the plan tests.