D0120 Dental Code: The Established-Patient Periodic Exam

The short version

# D0120 Dental Code: The Established-Patient Periodic Exam

D0120 is the CDT code for a periodic oral evaluation of an established patient, used to find changes since the patient's last comprehensive or periodic exam. The dentist updates the health history, reviews the teeth and soft tissues, and determines whether the treatment plan needs to change. A correct exam can still deny when it falls inside a plan's frequency period.

Bill D0120 for an established patient returning for a periodic evaluation of changes in oral and medical status.
Use D0140 for one specific problem, D0150 for a comprehensive baseline or qualifying major change, and D0180 when a comprehensive periodontal evaluation is the service completed.
Georgia Medicaid allows one D0120 every six months and won't pay it on the same date as D0140. It also requires at least 180 days between D0150 and D0120.
Diagnostic images are separate procedures when clinically needed. Select them from the patient's findings and history, not from a fixed exam package.
In a worked example, an $80 exam fee becomes a $55 PPO allowable. The plan pays $55 at a hypothetical 100% diagnostic benefit, the patient owes $0, and the office adjusts $25.
Record the updated histories, caries and periodontal findings, oral cancer evaluation where indicated, images reviewed, diagnosis, and treatment-plan changes.

What is D0120?

D0120 is a return-patient evaluation that checks what has changed since the last complete or periodic assessment. It includes the dentist's review and interpretation of information gathered during the visit.

Fact	D0120
CDT category	Diagnostic, clinical oral evaluations
Patient status	Established patient
Unit	One periodic evaluation per date of service
Main purpose	Identify changes since the prior comprehensive or periodic evaluation
Included scope	Current oral findings and oral cancer evaluation where indicated
Public fee reference	DC Medicaid listed $31 for adults and $35 for patients under 21 as of May 17, 2025

The ADA's head-and-neck cancer resource confirms that D0120 includes an oral cancer evaluation when the patient's findings and risk make it appropriate.

When do you bill D0120?

Bill D0120 when an established patient returns and the dentist performs a periodic review broad enough to update the patient's oral status and ongoing treatment plan.

Update the dental and medical histories and note relevant changes.
Examine the teeth, restorations, occlusion, soft tissues, and periodontal condition at the level the visit requires.
Review existing treatment and identify new disease or a changed priority.
Select radiographs or other tests from the clinical assessment and available image history.
Record the findings even when the evaluation shows no new treatment need.

The ADA's coding article places D0120 with established patients returning to check changes since an earlier comprehensive or periodic evaluation.

D0120 vs D0140, D0150, and D0180

The scope completed during the visit decides the evaluation code. Patient status alone doesn't settle every comparison.

Oral evaluation codes move from one focused complaint through a periodic update to a comprehensive baseline or periodontal evaluation.

	D0140 problem-focused exam	D0120	D0150 comprehensive exam	D0180
Main question	What is causing this specific problem?	What changed since the last exam?	What is the patient's full baseline and treatment need?	What is the full periodontal condition?
Patient	New or established	Established	New or established in defined situations	New or established with signs or symptoms of periodontal disease
Scope	Limited	Periodic	Comprehensive	Comprehensive periodontal
DC Medicaid fee	$45 adult	$31 adult	$69 adult	$78 adult

The high-risk error is using D0120 for a returning patient when the dentist actually completed a new comprehensive baseline after a significant health change or a long absence. The reverse also matters: a payer can deny a D0150 that only repeats a routine periodic review. Code the documented work, then check the benefit separately.

D0180 isn't an upgraded D0120 chosen only because probing took longer. It represents a comprehensive periodontal evaluation for a patient with signs or symptoms of periodontal disease.

What does insurance actually do with D0120?

Frequency limits often control D0120 payment. Georgia Medicaid's dental manual allows one periodic evaluation every six months, requires 180 days after D0150, and bars same-day D0140 or after-hours D9440. A published Delta Dental California plan also limits D0120 to once every six months per provider. Other contracts can count calendar periods or combined evaluation buckets differently.

Images aren't automatically included in D0120. The ADA's radiography recommendations call for patient-specific selection after the clinical assessment. Check each image code's own frequency because an eligible D0120 doesn't prove the bitewings or panoramic image will pay.

An $80 D0120 fee becomes a $55 allowable, with $55 paid by the plan, no patient balance, and a $25 contractual adjustment.

Office fee: $80
Contracted allowable: $55
Contractual adjustment: $25
Plan payment at 100%: $55
Patient balance: $0

Why does D0120 get denied?

Another D0120 falls inside the plan's six-month or other frequency period.
D0150, D0140, D0180, or another evaluation appears on the same date and the plan allows only one.
The plan counts evaluations across providers or locations and found a visit the office didn't see.
The note doesn't show an established-patient periodic evaluation or any updated findings.
Separate radiographs lack a patient-specific reason even though the exam itself is covered.

Confirm which service line denied.

What documentation gets D0120 paid?

Record the date and type of the prior comprehensive or periodic evaluation when available.
Update the medical and dental histories, medications, allergies, and current concerns.
Record caries, existing-restoration, soft-tissue, occlusal, and periodontal findings.
Document the oral cancer evaluation when indicated and any area that needs follow-up.
Identify each radiograph or diagnostic test reviewed and the patient-specific reason for new images.
State the diagnosis, treatment-plan changes, recall interval, and referrals.

Common questions about D0120

Can D0120 and D1110 be billed together?

They can be reported on the same date when the dentist performs the periodic evaluation and the hygienist or dentist provides a qualifying prophylaxis. Each line has its own coverage history. Minnesota's published D0120 exclusion list omits D1110. The office still has to verify both benefits under the patient's exact plan.

Is D0120 only for six-month recall visits?

No. Six months is a common benefit interval, not the clinical definition of the code. D0120 reports the periodic evaluation of an established patient. The dentist sets the recall interval from the patient's needs, while the plan decides whether that visit falls inside its covered frequency.

Can you bill radiographs with D0120?

Yes, when the images are clinically necessary and separately documented. The ADA recommends choosing radiographs from the patient's age, history, examination, disease risk, and available images. Report the image codes delivered and check their own benefit limits rather than assuming they're bundled with the exam.

When does an established patient need D0150 instead?

The ADA identifies an established patient with a significant health change or an absence from active treatment of three or more years as a D0150 situation. The dentist must complete and document the comprehensive scope. Returning to the office by itself doesn't make every visit D0120.

Check the exam history before recall

Don't schedule the next covered D0120 from memory; you've got to compare the last D0120 and D0150 dates with the plan. If the interval doesn't fit, don't promise coverage. When dates aren't clear, don't guess.

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