- D4910 is periodontal maintenance, billed only after completed active periodontal therapy (SRP D4341/D4342 or periodontal surgery) and continued for the life of the dentition.
- The CDT sets no fixed waiting period, but most payers expect the first D4910 roughly 8-12 weeks (~90 days) after active therapy.
- Frequency is commonly 3-4 times per year, though the interval is set by the clinician's evaluation and capped by the plan.
- Once a patient has had active perio therapy, most payers will not pay D1110 prophylaxis; some allow alternating D4910/D1110, but many deny the prophy.
- Top denials: no SRP/surgery history on file, frequency over the plan limit, and downcoding to D1110 - all preventable.
D4910 is the CDT code for periodontal maintenance, and it is one of the most misbilled procedures in dentistry. Per the ADA's Code on Dental Procedures and Nomenclature, D4910 is instituted following periodontal therapy and continues at varying intervals for the life of the dentition. In plain terms: a patient qualifies for periodontal maintenance only after they have actually been treated for periodontal disease. Bill it before active therapy is documented, or stack it against a routine prophy, and the claim bounces.
What D4910 periodontal maintenance covers
D4910 includes removal of bacterial plaque and calculus from supragingival and subgingival regions, site-specific scaling and root planing where clinically indicated, and polishing the teeth. The defining prerequisite is prior active periodontal therapy - either scaling and root planing (D4341 for four or more teeth per quadrant, D4342 for one to three teeth per quadrant) or periodontal surgery.
- Timing. The CDT sets no fixed interval, but most payers expect the first D4910 about 8-12 weeks (roughly 90 days) after active therapy completes.
- Frequency. A three-month recall (4x/year) is the common standard, with 3x/year also widely covered. The dentist's evaluation sets the interval, but plan limits cap reimbursement.
D1110 vs D4910: the core billing conflict
D1110 (adult prophylaxis) is for patients with generally healthy periodontium or localized gingivitis. D4910 is for patients with a history of periodontal disease who have completed active therapy. Once a patient transitions to periodontal maintenance, most payers consider them a perio patient and will not reimburse a routine prophy on the same recall track.
| Factor | D1110 (Prophylaxis) | D4910 (Periodontal Maintenance) |
|---|---|---|
| Patient status | Healthy periodontium / gingivitis | History of periodontitis, post active therapy |
| Procedure type | Preventive | Therapeutic |
| Prerequisite | None | Completed SRP (D4341/D4342) or perio surgery |
| Typical frequency | 2x / year | 3-4x / year |
| Includes site-specific SRP | No | Yes, where indicated |
Can you alternate D4910 and D1110?
Some payers permit alternating D4910 and D1110 (for example, two maintenance visits and two prophys per year), but many deny the prophy entirely for an established perio patient. There is no universal rule. The ADA notes that downgrading periodontal maintenance to a prophy is a payer policy decision, not a clinical one. The safe practice: verify the specific plan's alternating policy in writing before the visit, and never assume a patient ages out of perio status - the clinical record must support whichever code you bill.
Frequency and coverage patterns by payer type
| Payer pattern | D4910 frequency | D1110 alongside? | Common watch-out |
|---|---|---|---|
| Standard PPO | 4x/year (every 3 months) | Often denied for perio patients | Counts D4910 + D1110 toward one shared cleaning limit |
| Conservative PPO / DHMO | 2x/year | Rarely | Excess frequency is patient responsibility unless disclosed |
| Alternating-friendly plan | 2x D4910 + 2x D1110 | Yes, on a defined schedule | Must follow the exact alternating sequence |
| Medicaid (state-dependent) | Varies; often limited or excluded for adults | Varies | Many states exclude adult perio maintenance |
Two compliance notes: when frequency exceeds the plan limit, the excess visit is typically the patient's financial responsibility - disclose it in advance. And never re-bill a denied D4910 as D1110 to force payment; that is a coding integrity problem, not a workaround.
Common D4910 denials and how to fix them
| Denial reason | Why it happens | Fix |
|---|---|---|
| No history of SRP/surgery on file | Payer has no record of active therapy | Submit the prior SRP (D4341/D4342) or surgery date and record with the claim |
| D4910 billed too soon after therapy | Visit fell inside the healing window | Schedule first maintenance ~90 days post-therapy; document the completion date |
| Downcoded to D1110 | Payer reclassifies maintenance as prophy | Appeal with perio charting and a narrative establishing the perio diagnosis and prior treatment |
| Frequency over plan limit | More visits than the plan covers | Verify limits at eligibility; bill excess to the patient with prior written disclosure |
| Alternating prophy denied | Plan does not allow D1110 for perio patients | Confirm alternating policy before the visit; if not allowed, bill D4910 only |
Documentation that survives an audit
- Date of completed active therapy (SRP or surgery) recorded in the chart.
- Periodontal charting showing probing depths, attachment loss, and bleeding points.
- A short clinical narrative linking the maintenance visit to the prior diagnosis and treatment.
- Eligibility notes capturing the plan's frequency limit and alternating policy.
Frequently asked questions
The CDT does not specify a fixed waiting period, but most payers expect the first periodontal maintenance visit roughly 8 to 12 weeks (about 90 days) after active therapy is completed. Document the completion date of the SRP or surgery so the timing is defensible.
Sometimes. Some payers allow alternating D4910 and D1110 on a defined schedule, but many will not reimburse a routine prophylaxis for a patient who has transitioned to periodontal maintenance. Always verify the specific plan's alternating policy in writing before the visit.
Periodontal maintenance is commonly performed 3 to 4 times per year, typically every three months. Coverage caps vary: standard PPOs often allow four per year, while conservative plans may limit to two. Confirm the frequency limit during eligibility verification.
Payers downcode when they have no record of prior active periodontal therapy or when policy reclassifies maintenance as a prophy. Fix it by submitting the prior SRP or surgery date, periodontal charting, and a clinical narrative establishing the perio diagnosis, then appeal.
It depends on the state. Adult periodontal maintenance is limited or excluded under many state Medicaid programs, while others cover it with frequency caps. Always check the specific state Medicaid dental benefit and verify the patient's eligibility before scheduling.