Periodontal charting codes determine whether a hygiene claim is approved, adjusted, or flagged for review—and the difference often comes down to what the chart contains, not just what was done. CDT (Current Dental Terminology) coding accuracy requires two things from every hygienist: selecting the code that matches the clinical presentation, and ensuring the documentation on file supports it. When those two elements diverge, the practice absorbs the financial consequence.

This reference is organized around the codes you encounter most during recall and active-therapy appointments. For each one, you will find the clinical thresholds that indicate appropriate use and the documentation elements payers expect to see during a review. Whether you are deciding between D1110 and D4346 or confirming a patient’s readiness for D4910 maintenance, this cheat sheet is designed to be practical rather than theoretical.

The Core Periodontal Charting Codes

The CDT D4000 series covers periodontal services. Combined with prophylaxis codes from the D1000 series, these are the codes most active in a hygiene schedule:

• D1110 – Adult prophylaxis. Appropriate for patients 18 and older who present with healthy gingiva or mild, localized gingivitis. Probing depths are generally within normal limits, bleeding on probing (BOP) is minimal, and there is no clinical attachment loss (CAL) or radiographic bone loss to support a periodontitis diagnosis.
• D4341 – Periodontal scaling and root planing (SRP), four or more teeth per quadrant. Requires documented CAL, radiographic bone loss, and probing depths consistent with periodontitis—typically 4 mm or greater with BOP or suppuration. Treat four or more teeth in the quadrant to bill this code for that quadrant.
• D4342 – SRP, one to three teeth per quadrant. Same medical necessity requirements as D4341, narrower scope. Both codes may be billed in the same appointment for different quadrants when clinical findings warrant it.
• D4346 – Scaling in the presence of generalized moderate or severe gingival inflammation. Used when a patient has widespread BOP and inflamed tissue but does not have the CAL or bone loss that would indicate periodontitis. Requires documentation of generalized—not localized—inflammation.
• D4355 – Full-mouth debridement. A preparatory, one-time code for appointments where heavy calculus or deposits prevent a comprehensive periodontal evaluation. A separate comprehensive evaluation at a subsequent appointment is required to complete the clinical picture.
• D4910 – Periodontal maintenance. Assigned following completion of active periodontal therapy (D4341, D4342, or surgical codes). The patient record must document a history of active therapy; this code is not a substitute for adult prophylaxis and is not appropriate for patients who have never received periodontal treatment.

What the Chart Must Contain to Support Each Periodontal Charting Code

The CDT code is the label. The chart note is the evidence. Payers increasingly pull clinical records—not just the superbill—during audits of periodontal claims, and the documentation standard for each code is specific.

For D4341 and D4342

The chart should include a full or partial periodontal probing chart with six measurements per tooth, BOP notation, and recession data. CAL must be documented—this is the clinical finding that distinguishes periodontitis from gingivitis in the record. Radiographic bone loss should be noted by the diagnosing provider. Recording the diagnosis using stage-and-grade periodontal classification (for example, Stage II, Grade B, generalized) gives reviewers a clear and defensible framework. Rebrief’s glossary covers the 2017 World Workshop staging criteria if you need a reference point.

For D4346

Documentation must demonstrate generalized BOP with moderate or severe inflammation across multiple sextants or quadrants. Equally important: an explicit note that attachment levels are within normal limits. This is what differentiates D4346 from D4341 clinically and protects the claim from a challenge asserting that SRP was the appropriate service instead.

For D4910

The chart must reference prior active therapy—the date, the code, and the quadrants or teeth treated. A current probing chart or notation of stability or change since the last maintenance visit supports the continuing-care rationale. Include the recommended maintenance interval (3-, 4-, or 6-month) and the clinical reason for it.

For D4355

Document why the comprehensive evaluation could not be completed and when the follow-up evaluation is scheduled. D4355 without a subsequent evaluation on record is an incomplete clinical story that reviewers notice.

The D1110-to-D4910 Transition: A High-Stakes Documentation Moment

One of the most consequential charting decisions in hygiene practice is not which probing depth to record—it is how the record reflects the transition from prophylaxis to periodontal maintenance. Once a patient has periodontitis and has completed active therapy, their clinical baseline has changed. Continuing to bill D1110 for subsequent hygiene visits understates the service and misrepresents the patient’s condition in the chart. Billing D4910 without documented active therapy history creates audit exposure that is difficult to defend.

The transition note does not need to be lengthy. Four elements are sufficient:

• The date and CDT codes of completed active therapy
• The patient’s periodontal status at the time of the transition appointment
• The maintenance interval selected and the clinical rationale for it
• Any sites remaining active or requiring ongoing monitoring

A two- or three-sentence narrative handles all of this. The challenge is that hygienists rarely have uninterrupted documentation time between patients. The Rebrief charting platform captures encounter details as the appointment unfolds, allowing the transition note to be structured and complete before the patient leaves the chair.

Audit Red Flags Payers Watch For

Understanding payer review logic helps hygienists document proactively rather than reactively. Common triggers that move a claim from routine processing to manual review include:

• D4910 claims with no prior active therapy documented in the patient record
• D4341 or D4342 claims with no CAL or radiographic bone loss on file
• D4346 assigned when probing depths and attachment levels suggest periodontitis rather than gingivitis
• Identical probing data repeated across consecutive recall visits, suggesting templated rather than individualized charting
• Incomplete or absent BOP notation across the full arch
• D4355 billed without a follow-up evaluation code on record at the same or a subsequent date of service

PracticeShield™ is designed to catch these exposure points before a claim is submitted. The chart-audit layer evaluates documentation against payer criteria and surfaces gaps—missing CAL entries, incomplete BOP, absent transition language—so they can be resolved while the record is still fresh rather than after a denial arrives.

Documentation Efficiency Without Shorter Records

The average clinician spends 4.4 hours per week on documentation. For hygienists managing a full recall schedule, that is real clinical time. The answer is not shorter records—complete documentation is what protects both the claim and the patient. The answer is smarter capture.

Intelligent reprompting™ monitors the clinical encounter in real time and flags missing chart elements before the appointment ends. If BOP notation is absent, recession data is not recorded, or the D4910 transition rationale has not been entered, the system surfaces the gap while the hygienist is still at chairside—not at the end of the day when reconstructing the visit from memory.

SmartStart™ contributes at the front end of the appointment. It pre-populates visit prep data from prior records—previous periodontal codes, last probing depths, recommended maintenance interval, open flags from the prior visit—so the hygienist enters the operatory with clinical context already organized. That preparation compresses the orientation phase and creates room for more precise documentation during the encounter.

If your practice is managing audit exposure from incomplete periodontal records—or if your hygiene team is losing chair time to documentation overhead—see what the workflow looks like in practice. Reserve a demo to walk through the charting workflow with a Rebrief specialist.

Accurate periodontal charting codes, backed by complete clinical records, are what converts a correctly performed service into a correctly reimbursed one.