D1110 Dental Code: Adult Prophylaxis Billing Guide

What D1110 covers

D1110 reports a prophylaxis in the permanent or transitional (mixed) dentition. The procedure includes removal of plaque, calculus, and stains from the supragingival and sub-gingival tooth surfaces (the parts of the tooth above and just below the gumline) where periodontal pockets are within healthy limits. Per the ADA, dentition (not the patient’s age) is the criterion that separates D1110 from the child prophy (D1120). The visit usually pairs with a periodic evaluation and may include polishing.

It does not cover:

• A patient still in primary or mixed (transitional) dentition. Use D1120 (child prophylaxis). The distinction is dentition, not age.
• A patient with active periodontal disease or post-SRP maintenance. Use D4910.
• Scaling on a patient with full-mouth gingivitis. Use D4346.
• Scaling and root planing for periodontal pockets. Use D4341 or D4342.

D1110 assumes a periodontally healthy patient. If the chart shows perio diagnosis, the code is generally wrong.

When to bill D1110

Bill D1110 when:

• The patient has permanent (or predominantly permanent) dentition. Per the ADA, dentition (not age) is the coding criterion, though most carriers use age 14 as a benefit proxy.
• The chart shows a periodontally healthy patient with no active perio diagnosis.
• The visit is a routine prophy, not a maintenance visit following SRP.

Do not bill D1110 for:

• Patients still in primary or mixed dentition. Use D1120. (A child with full permanent dentition is correctly D1110 regardless of age; the age cutoff some plans apply is a benefit rule, not the coding definition.)
• Patients with history of D4341, D4342, or perio surgery on the same dentition. Use D4910.
• Patients with full-mouth moderate to severe gingivitis. Use D4346.
• Periodontal recall after active perio therapy. Use D4910.

Top reasons D1110 gets denied

1. Frequency. Most plans pay two prophy benefits per benefit year, often on a six-month interval. A patient seen at five months hits the cap.
2. Perio history in carrier records. The carrier knows the patient had D4341 or D4342 in the past. Billing D1110 after that draws an automatic denial in favor of D4910.
3. Plan age proxy. D1110 vs D1120 is selected by dentition, not age, so a 12-year-old with permanent dentition is correctly D1110, but many plans apply an age proxy (often 14) and will downcode or deny D1110 for a younger patient. When the dentition supports D1110, bill it and dispute an age-based downcode rather than recoding to D1120.
4. Same-day eval bundling. The eval and prophy were billed together, and the plan bundles them under a single benefit. The prophy still pays. The eval line may zero out.
5. Gingivitis case. A patient with full-mouth gingivitis should have been coded D4346. Carriers occasionally deny D1110 and require correction to D4346 when the clinical picture suggests it.

Documentation that supports the claim

The claim needs:

• Date of service.
• The patient’s dentition (and date of birth, which carriers use for their age-proxy benefit rules).
• A periodontally healthy status reflected in the chart.

For the patient record, document:

• Probing depths consistent with health (generally 3mm or less, no significant bleeding).
• Calculus removal performed.
• Polishing performed if it was part of the visit.
• Hygienist notes.

If the chart shows perio pocketing or bleeding on probing, D1110 is the wrong code for that visit, and the carrier may eventually catch it on audit.

D1110 versus the perio recall codes

The line between prophy and perio recall is one of the most frequent sources of confusion:

• D1110 assumes a healthy patient with no active perio diagnosis.
• D4910 assumes the patient has completed active periodontal therapy (typically D4341 or D4342, sometimes surgery) and is on a maintenance interval, usually every three months.

A patient who had SRP three years ago and has been seen for “prophy” every six months since may still belong on a D4910 protocol clinically. Some practices alternate D1110 and D4910 across the year. The plan’s benefit design and the patient’s chart drive which code is correct on a given visit.

Example case

A 38-year-old established patient comes in for a six-month recall. Probing depths are all 3mm or less. No bleeding on probing. No history of SRP or perio surgery. The hygienist completes a routine prophy. The dentist performs the recall exam.

Billing steps:

1. Verify the patient has prophy benefits remaining for the benefit year.
2. Code D1110 for the prophy and D0120 for the eval, same claim.
3. Watch for either both lines paying, or one bundled into the other under the plan’s preventive benefit.
4. If the prophy denies for perio history flag, pull the patient’s history. If perio therapy was actually performed at the practice in the past, switch to D4910 and resubmit.

What to get right in your PMS

1. Code by dentition, then check the carrier’s age rule. D1110 vs D1120 is selected on the patient’s dentition (permanent/transitional vs primary/transitional), not age, but most plans enforce an age proxy (commonly 14) and may downcode based on age at the date of service. Confirm both before submission.
2. Check the patient’s perio history in your own chart before submission. If the chart shows prior D4341 or D4342, the recall is probably D4910, not D1110.
3. Submit prophy and eval together when both happen at the same visit. Splitting them across claims complicates posting.
4. Confirm the carrier’s frequency cap counts benefit years, not calendar years. Some plans run benefit years on the patient’s enrollment anniversary.
5. Use D4910 when the patient was previously treated for periodontal disease at the practice, even if it was years ago. Switching back to D1110 long-term is a common cause of audit issues.