D4910 Dental Code: Periodontal Maintenance Billing Guide

What D4910 covers

D4910 reports a periodontal maintenance visit on a patient who has completed active periodontal therapy. The visit includes removal of supragingival and sub-gingival plaque and calculus, site-specific scaling on residual pockets if present, and an evaluation of the patient’s perio status.

D4910 assumes a perio patient on a maintenance interval, typically three months apart, indefinitely.

It does not cover:

• A patient who has never had SRP or perio surgery. Use D1110.
• Active periodontal therapy. Use D4341 or D4342.
• Gingivitis treatment in the absence of bone loss. Use D4346.
• Localized antimicrobial delivery into a specific pocket. Use D4381.

Once a patient enters perio maintenance, they generally remain in it permanently. Reverting to D1110 long-term is not standard and creates documentation issues.

When to bill D4910

Bill D4910 when:

• The patient has documented history of SRP (D4341 or D4342) or periodontal surgery.
• The patient is on a maintenance recall (commonly three months).
• The chart reflects ongoing periodontitis or stable perio status.

Do not bill D4910 for:

• A patient with no prior perio therapy. The carrier will deny.
• A patient who has only had a prior prophy. The clinical history doesn’t support maintenance.
• Active SRP on a recurring pocket. Use D4341 or D4342, not maintenance.
• A purely gingivitis case. Use D1110 or D4346 depending on severity.

Top reasons D4910 gets denied

1. No perio therapy on file with the carrier. The most common cause. The carrier’s records don’t show prior D4341, D4342, or perio surgery for this patient. Without that history, the carrier denies and offers a D1110 alternate.
2. Frequency exceeded. The patient hit the D4910 cap (often four per benefit year). Some plans auto-convert the extra visit to a prophy at the D1110 allowable.
3. Documentation didn’t support maintenance. The chart shows healthy probing depths and no perio diagnosis. The carrier reclassifies the visit.
4. Patient is new to the practice. Even if the patient had SRP at a prior office, the new practice’s first claim under that carrier may be denied until the patient’s history is established with the carrier.
5. Mixed-frequency confusion. The plan pays two D4910 and two D1110 per year, but the practice billed three D4910 and one D1110, hitting the maintenance cap.

Patient qualification

The carrier qualifies the patient for D4910 by claim history, not by the chart at the new practice. A new patient who transfers in with a perio diagnosis and recall schedule may still see denials until:

• Prior perio therapy is on file (claim or appeal documentation).
• The patient’s plan year resets with the new practice as the provider of record.
• A current perio evaluation is documented and submitted with the first D4910 claim.

For transfer patients, attaching the prior perio chart and a current perio evaluation to the first D4910 claim helps the carrier connect the history.

Mixing prophy and maintenance in a single year

Many plans support a hybrid model: two D4910 visits and two D1110 visits per benefit year. The patient comes in every three months. The clinical case is still periodontitis, and the chart should reflect that at every visit. The choice of code on a given visit is a billing decision tied to which benefit pool funds the visit.

Common patterns:

• Two D4910 (covered as perio maintenance) and two D1110 (covered as preventive). The patient pays nothing if both benefits are at 100%.
• Four D4910, two paid as maintenance and two paid at the prophy allowable. The patient owes the differential on the last two if the plan converts.
• Three D4910 and one D1110, when the practice tries to bill mostly perio. Often hits the cap on the third or fourth visit.

The cleanest approach is to verify the plan’s recall benefit structure before the patient’s first visit of the year, then schedule the four visits with codes that match the benefit design.

Documentation that supports the claim

The claim needs:

• Patient history showing prior D4341, D4342, or perio surgery.
• Current perio status documented at the visit.
• Probing depths charted, even if stable.
• Any site-specific scaling performed.

For the patient record, document:

• Probing depths at six sites per tooth.
• Bleeding on probing, if present.
• Pockets that received site-specific instrumentation.
• Stability or progression compared to the prior visit.

A maintenance visit charted as “prophy completed, patient stable” is too thin for a perio code. The chart should reflect that the visit was a perio recall, not a routine cleaning.

D4910 versus D1110

The two codes are clinically and procedurally similar but apply to different patient populations:

• D1110 is for periodontally healthy patients on a routine recall, typically every six months.
• D4910 is for patients with a history of active periodontal therapy on a maintenance interval, typically every three months.

A patient on D4910 has a clinical case that justifies more frequent recalls and site-specific instrumentation as needed. A patient on D1110 has periodontal health and standard prophy needs.

Switching a perio patient back to D1110 long-term is not standard. The carrier eventually notices the pattern and may audit.

Example case

A 54-year-old patient completed SRP in all four quadrants 18 months ago. The patient is on a three-month maintenance recall and has had three D4910 visits since active therapy completed. The current visit is the fourth in the benefit year. Probing depths are stable (3-4mm with one residual 5mm at #30). No bleeding except at #30.

Billing steps:

1. Confirm the plan’s D4910 frequency cap. If the cap is four per year, this visit qualifies.
2. Code D4910 with the current perio chart and prior SRP history on file.
3. Site-specific scaling at #30 is part of the maintenance visit, not a separate code.
4. If the plan caps at two D4910 with a prophy alternate for the remaining two, the third or fourth visit may pay at the D1110 allowable. Plan ahead by coding two visits as D4910 (first and third of the year) and two as D1110 (second and fourth), or accept the downgrade on the fourth visit.

What to get right in your PMS

1. Verify the patient’s perio history is on file with the carrier before billing D4910. A new patient with perio diagnosis from a prior practice needs the history established before the first maintenance claim pays.
2. Document probing depths at every maintenance visit. A maintenance visit without a current chart looks like a prophy to an auditor.
3. Verify the plan’s recall benefit structure before scheduling the year’s visits. Two D4910 plus two D1110 is a common pattern. Four D4910 hits a cap on many plans.
4. Don’t revert to D1110 long-term once the patient is on maintenance. It looks like under-treatment of a perio case in an audit.
5. Code site-specific scaling at one or two pockets as part of the D4910 visit, not as a separate procedure code. Adding D4381 (localized antimicrobial) is a different procedure that requires its own documentation.