D1110 is the CDT code for an adult prophylaxis — the routine professional cleaning that removes plaque, calculus, and stains from the teeth of a patient with a generally healthy periodontium. It's the everyday "cleaning" performed at a recall visit, intended to control irritants both above and at the gumline.
Informational only — confirm the official CDT descriptor and your payers' rules independently. This is general guidance, not billing, coding, or clinical advice.
When to Use the D1110 Code
Report D1110 for the routine cleaning of an adult patient — generally a patient with adult dentition and healthy or gingivitis-level tissue, most often age 14 and older per common payer convention. It's the preventive cleaning paired with a periodic evaluation at a six-month checkup.
Choose the right cleaning code for the patient and the periodontal condition. Use D1120 (prophylaxis — child) for patients with primary or transitional (mixed) dentition, typically under age 14. If the patient has active periodontitis with bone loss, the cleaning is usually D4341/D4342 (scaling and root planing) followed by D4910 (periodontal maintenance) — not D1110. Coding a periodontal patient as a routine prophylaxis is a common error, and coding a child's cleaning as D1110 can trigger an age-based denial.
Documentation & Clinical Scenarios
A routine cleaning still needs a chart that shows preventive care was actually delivered:
- The date and the patient's periodontal status (a recent perio charting or screening supporting "healthy/gingivitis," not periodontitis).
- What was removed — supragingival/gingival plaque, calculus, and stain.
- The provider (hygienist or dentist) who performed the prophylaxis.
- Other services the same day — the periodic evaluation (D0120), radiographs, or a fluoride application (D1206) — each documented under its own code.
If the tissue shows active periodontal disease, the chart should reflect that, since billing D1110 on a periodontally involved patient is a frequent audit flag.
Insurance & Billing Tips
- Know the frequency limit. Most plans cover two prophylaxes per benefit year (often one every six months); a third in the same year is commonly denied.
- Pair, don't bundle. D1110 and the periodic evaluation (D0120) are separate procedures on separate lines — both are typically payable on the same date.
- Don't mix prophy with perio. A patient in active periodontal therapy is usually billed D4910, not D1110; alternating the two improperly can cause denials.
- Watch the age cutoff. Submitting D1110 for a patient the plan considers a child (often under 14) can be down-coded to D1120.
- Read the EOB. If a cleaning is denied for frequency, the patient's exam and cleaning history confirms timing for an appeal.
Example Case
An established 35-year-old patient with healthy gums arrives for a six-month checkup. The hygienist removes plaque, calculus, and light coffee stain, and the dentist completes the recall evaluation. The visit is coded D1110 for the adult prophylaxis, D0120 for the periodic evaluation, and the appropriate radiograph code — each on its own line. Because the office confirmed the patient was within their two-cleanings-per-year benefit, the claim processes cleanly.
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Frequently Asked Questions
What's the difference between D1110 and D1120?
Both are routine prophylaxes; the difference is the patient. D1110 is the adult cleaning, used for patients with adult dentition (commonly age 14 and older), while D1120 is the child prophylaxis for primary or mixed dentition. Submitting D1110 for a young child — or D1120 for an adult — can trigger an age-based denial or down-code, so match the code to the dentition and the plan's age convention.
Is the exam included in D1110?
No. D1110 covers only the cleaning. The doctor's evaluation is a separate procedure reported under its own code, usually the periodic evaluation (D0120) for an established recall patient. They're billed on separate lines on the same date, and the chart should distinguish the hygiene service from the doctor's exam.
How often will insurance cover D1110?
Most plans cover two prophylaxes per benefit year, frequently limited to one every six months. A third cleaning in the same year is commonly denied unless the plan offers an additional benefit. Tracking each patient's cleaning history helps you schedule and bill within the limit and avoid surprise frequency denials.
When should a cleaning be billed as periodontal maintenance instead?
When a patient has active periodontitis with bone loss — or has completed scaling and root planing — the ongoing cleaning is usually D4910 (periodontal maintenance), not D1110. Billing a routine prophylaxis on a periodontally involved patient is a common audit flag, so the periodontal charting in the record should support whichever code is used.
Confirm the current CDT descriptor and your specific payer policies before billing — browse the full dental code library or see our insurance verification feature.