CDT Code D1110: Adult Prophylaxis Billing Guide
The highest-frequency code in general dentistry — and one of the most commonly affected by quiet PPO rate changes.
CDT code D1110 reports an adult prophylaxis — the routine cleaning performed at recare visits for patients aged 14 and older. It is the highest-volume code in most general practices, billed at nearly every recall visit alongside the periodic oral evaluation.
Because D1110 is billed so frequently, even small changes in its contracted fee compound rapidly. A $5 reduction in D1110 reimbursement across a 2,000-visit-per-year practice is $10,000 in annual revenue — and these reductions happen quietly when carriers update fee schedules.
What D1110 includes
The CDT descriptor for D1110 is “Prophylaxis — adult.” The code includes:
- Removal of plaque, calculus, and stains from the tooth surfaces
- Polishing of the teeth
- Cleaning performed above and at the gumline (supragingival and at the gingival margin)
- Patient education on oral hygiene
D1110 is for patients who are periodontally healthy or have only gingivitis. Patients with periodontitis and ongoing disease activity should transition to D4910 (periodontal maintenance) following active periodontal therapy.
D1110 ends where periodontal disease begins. When there is clinical periodontitis — probing depths of 4mm or greater with bone loss — the appropriate code is either active therapy (D4341, D4342) or maintenance (D4910), not prophylaxis.
D1110 vs. D1120 vs. D4910
| Code | Age/Condition | Clinical Scenario |
|---|---|---|
| D1110 | Age 14+, periodontally healthy or gingivitis | Routine recare cleaning |
| D1120 | Under 14, primary or transitional dentition | Child prophylaxis |
| D4910 | Any age with history of periodontal treatment | Ongoing periodontal maintenance |
| D4346 | Any age with generalized moderate/severe gingivitis | Full-mouth scaling in presence of gingivitis (not periodontitis) |
D1110 reimbursement
D1110 is reimbursed at the preventive/diagnostic tier on most dental plans, typically at 100 percent of the contracted fee with no patient deductible for preventive services. However, the contracted fee varies significantly by carrier and plan.
National UCR fees for D1110 generally range from $85 to $140. PPO contracted rates are typically 40–65 percent of UCR, creating a per-visit write-off that multiplies by every hygiene appointment.
Why D1110 rate changes hit hardest
Because D1110 is billed so frequently, it is the code where quiet fee schedule reductions have the largest cumulative effect on a practice.
- A typical 4-op general practice with 2 hygienists performs approximately 2,000 to 3,000 D1110 procedures per year
- A $5 reduction in the contracted fee = $10,000 to $15,000 in annual revenue
- A $10 reduction = $20,000 to $30,000
- These changes typically happen in January without any direct notification to the practice
Practices that do not monitor their D1110 reimbursement by carrier and by plan can absorb significant rate cuts without ever realizing it.
Common D1110 denials
Frequency exceeded
Most plans allow two D1110 per calendar year or every six months. Patients arriving slightly before the six-month anniversary are the most frequent source of benefit denials. Some plans use rolling 180-day lookbacks, others calendar-year counts — the distinction affects edge-case scheduling.
Age limitation
D1110 is for patients 14 and older. Patients under 14 should be coded D1120. Billing D1110 for a 13-year-old is a claim submission error that typically results in re-coding by the carrier, though the paid amount may differ.
Periodontal history conflict
Patients with a documented history of periodontal treatment (SRP) should generally transition to D4910. Some carriers flag D1110 claims for patients with a prior D4341 in their history and deny the D1110 as not appropriate for the clinical scenario.
Bundled with exam denial
Some plans calculate the preventive benefit as a bundle (exam + prophy + bitewings) and pay a fixed amount for the bundle. Practices expecting individual line-item reimbursement may see lower-than-expected total payments.
What patients typically pay
- Without insurance: $85 to $150 per cleaning depending on market
- With dental PPO at in-network rate: Typically $0 to $20 after insurance covers preventive services at 100 percent (deductible usually does not apply to preventive)
- With HMO/DMO plan: Usually a $0 copay for routine cleaning
- Medicare: Original Medicare does not cover routine dental cleaning; Medicare Advantage plans with dental benefits typically cover D1110 under their fee schedule
D1110 and practice-level monitoring
Because D1110 rates drift quietly and the cumulative impact is so large, systematic monitoring matters more for this code than perhaps any other. Practices that check their top-5 carriers’ D1110 fee schedule every January catch rate changes in time to renegotiate or drop plans where the math no longer works.
Practices that don’t monitor find out months later — often when a cash flow review surfaces an unexplained revenue drop that traces back to a silent hygiene fee reduction.
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