D0180 is the CDT code for a comprehensive periodontal evaluation, with six-point probing and full charting on every tooth.
- When to use: A new or established patient shows signs, symptoms, or risk factors for periodontal disease, such as bleeding, recession, smoking, or diabetes.
- When not to use: A comprehensive exam without full perio charting is D0150, a recall is D0120, and a deep workup of one flagged condition is D0160.
- Billing note: Many plans count D0180 and D0150 against one shared limit, so check for a recent D0150 and keep the full perio chart on file.
What D0180 covers
D0180 reports a comprehensive periodontal evaluation. It records the patient’s full periodontal status: full-mouth probing with six measurements per tooth, complete periodontal charting, bleeding on probing, gingival recession, clinical attachment levels, furcation involvement, and tooth mobility. It also includes the broader comprehensive-exam elements: medical history review, a general health and wellness assessment, an oral cancer screening, and an assessment of current dental conditions.
The code is indicated for patients who show signs or symptoms of periodontal disease, or carry risk factors such as smoking, diabetes, or a relevant systemic medical condition. It applies to both new and established patients.
What separates D0180 from D0150 and D0120
All three are evaluations, and the lines between them are about the work done, not how new the patient is.
D0180 (comprehensive periodontal evaluation) is built around the periodontium. Full-mouth six-point probing and complete periodontal charting are the defining work. Use it when signs, symptoms, or risk factors point to periodontal disease and the full periodontal data set is needed to diagnose and plan.
D0150 (comprehensive oral evaluation) is the general comprehensive exam for a new patient, an established patient with a significant change in health, or one who has been out of active treatment for three or more years. It is thorough, but not built around full-mouth periodontal charting.
D0120 (periodic oral evaluation) is the recall exam for an established patient whose baseline is already on file. It checks what has changed since the last comprehensive or periodic evaluation, and it is the lightest of the three.
When a previous comprehensive or periodontal evaluation has flagged a condition that needs a much more extensive, problem-focused workup with additional diagnostic modalities, that visit is D0160, the in-depth problem-focused workup, not a second D0180.
The documentation that supports D0180
The periodontal workup is the code, so the chart has to show it:
- The clinical indication. Why a periodontal evaluation was warranted: reported symptoms, visible inflammation or recession, a risk factor like smoking or diabetes, or a history that points to periodontal disease. This is what separates a legitimate D0180 from an upcoded comprehensive exam under audit.
- Full-mouth six-point probing. Six recorded measurements per tooth. This is the most important element. Partial or spot-check probing does not support D0180.
- Complete periodontal charting. Bleeding on probing, recession, clinical attachment levels, furcation involvement, and mobility, mapped across the mouth rather than summarized in a sentence.
- The broader exam elements. Medical history, oral cancer screening, and the overall dental assessment.
A D0180 with no periodontal charting gives a reviewer reason to question the claim, and a comprehensive exam with no periodontal focus billed as D0180 looks like an upcode. If your PMS can prompt for or require a perio chart when D0180 is selected, turn that on.
Frequency and the shared-limit trap
Coverage and frequency on D0180 are plan-dependent, and one pattern causes more denials than any other: many carriers count D0180 and D0150 against a single combined allowance for comprehensive evaluations, commonly one every 12 to 36 months.
On a plan with a shared window, a D0150 done last year can use up the allowance, so a D0180 this year denies for frequency even though it reports different work. Some plans track the two separately. Check the specific plan, and note on the carrier record which plans combine them. A denial under a shared limit is the plan’s language, not a coding error to appeal, and knowing the rule before the visit lets you set fee expectations with the patient.
D0180 and the periodontal treatment codes
D0180 documents periodontal status. What it finds determines the treatment code, and those codes turn on different clinical thresholds:
- D4346 (scaling with generalized moderate or severe gingival inflammation) is for a patient with generalized inflammation but no bone loss: gingivitis rather than periodontitis. The dividing line from scaling and root planing is attachment and bone loss.
- D4341 and D4342 (scaling and root planing) are therapeutic procedures for periodontitis, indicated when there is attachment loss and bone loss. D4341 reports a quadrant with four or more affected teeth; D4342 reports one to three teeth in a quadrant. The split is the number of teeth treated per quadrant, not pocket depth.
- D4910 (periodontal maintenance) is the ongoing maintenance interval that follows active periodontal therapy. It is not a prophylaxis and not the diagnostic exam.
The evaluation and the treatment are separate procedures. D0180 reports only the evaluation.
FAQs
- What is the difference between D0180 and D0150?
- D0180 adds full-mouth periodontal charting; D0150 does not. D0150 is the comprehensive oral evaluation for a new patient, an established patient with a significant health change, or one away from active treatment for three or more years. D0180 is the comprehensive periodontal evaluation, with six-point probing and complete periodontal charting, for patients with signs, symptoms, or risk factors for periodontal disease. Both cover new and established patients, so the split is the work and the clinical indication. The common mistake is billing D0180 as a higher-paying comprehensive exam without the perio charting to support it.
- Can D0180 and D0150 be billed on the same day?
- No. They are mutually exclusive comprehensive evaluations for the same visit, so report the one you performed and documented. A full-mouth periodontal workup with six-point probing and charting, done because of perio signs or risk factors, is D0180. A comprehensive oral evaluation without that periodontal focus is D0150. Many carriers also apply a shared frequency limit across the two, so even on separate dates one can use up the other's allowance.
- How often will insurance pay D0180?
- It is plan-dependent, but a common limit is once every 12 to 36 months. Many carriers count D0180 and D0150 against one combined comprehensive-evaluation allowance rather than giving each its own, which trips up offices that alternate between the two. Verify the plan's frequency rule and whether the codes share a window before assuming a D0180 will pay after a recent D0150.
- Does D0180 require periodontal charting to be billed correctly?
- Yes. The full-mouth periodontal assessment defines the code: six measurements per tooth, bleeding on probing, recession, clinical attachment levels, furcation involvement, and mobility, recorded as complete periodontal charting. Without that charting the code is not supported, even if the patient has periodontal disease, and carriers that audit will look for it.
- Does the patient need a periodontal diagnosis for D0180?
- No, but the chart needs a documented clinical indication. D0180 is for patients who show signs or symptoms of periodontal disease, or carry risk factors such as smoking or diabetes. A confirmed diagnosis isn't required beforehand, since the exam is part of how you reach one. Billing D0180 on a healthy patient with no perio findings and no risk factors is a coding error a reviewer can catch.
- Can a general dentist bill D0180 or is it only for periodontists?
- A general dentist can bill D0180. The code is not restricted to periodontists; it follows the procedure performed, not the provider's specialty. If the patient meets the clinical indication and the full-mouth periodontal evaluation is performed and documented, a general practice can report it.
Related codes
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CDT codes are maintained by the American Dental Association. This page is an editorial billing guide, not the official ADA code descriptor. Verify current coverage policies with each carrier before submitting claims.