Understanding Dental Codes D0120 and D0150: What Every Dental Office Should Know
If you work in dental billing or manage a dental practice, you’ve likely seen procedure codes D0120 and D0150 come up frequently. These two evaluation codes are essential for accurate billing, insurance reimbursement, and compliance — yet they’re often misunderstood.
Let’s break them down clearly.
🦷 D0120 – Periodic Oral Evaluation
What it is:
D0120 is used for an established patient receiving a routine exam.
When to use it:
- The patient has been seen before
- It’s a regular check-up (typically every 6 months)
- The dentist evaluates changes since the last visit
What it includes:
- Review of medical and dental history
- Clinical exam of teeth and gums
- Evaluation of changes in oral health
- Diagnosis and treatment plan updates
Common billing mistake:
Using D0150 for a returning patient instead of D0120. Many insurance carriers will deny, downgrade, or flag these claims for review.
🦷 D0150 – Comprehensive Oral Evaluation
What it is:
D0150 is for a new patient or a patient who hasn’t been seen in several years and requires a full, comprehensive exam.
When to use it:
- First visit to your practice
- Patient inactive for 3+ years (payer-dependent)
- Extensive evaluation is necessary
What it includes:
- Complete medical and dental history
- Full oral evaluation
- Charting and periodontal assessment
- Occlusal evaluation
- Oral cancer screening
- Comprehensive treatment planning
Because this exam is more detailed, reimbursement is typically higher than D0120 — but frequency limitations apply.
⚠️ Why Proper Coding Matters
Incorrect use of D0120 and D0150 can:
- Trigger insurance audits
- Cause claim denials or downgrades
- Delay payments
- Create compliance risks
Insurance carriers carefully monitor exam frequency. Most plans allow:
- 1–2 periodic exams (D0120) per year
- 1 comprehensive exam (D0150) per patient per provider within set frequency limits
Proper documentation and insurance verification are critical to protecting your revenue.
🚀 Ready to Reduce Denials and Increase Collections?
If your dental office is experiencing:
- Frequent coding errors
- Insurance downgrades
- Aging A/R from exam-related denials
- Front desk confusion about exam frequency
It may be time to bring in expert support.
Our dental billing team specializes in accurate coding, insurance follow-ups, and maximizing reimbursement — so your team can focus on patient care instead of paperwork.
Let’s clean up your claims and strengthen your revenue cycle.
📞 Contact us today to schedule a complimentary revenue review and see where your practice may be leaving money on the table.