D4910 — Periodontal maintenance

What periodontal maintenance involves

Periodontal maintenance is the recall visit for someone who has been treated for periodontitis. It is not a cleaning with a different name: it includes scaling above and below the gumline at every site, updated probing measurements, an assessment of whether any site has deteriorated, and localised re-treatment of sites that have. Polishing is part of it, but it is the smallest part. Once a patient has had periodontal therapy they generally remain on this code indefinitely, at an interval of three to four months rather than six.

When this treatment is used

Reported after active periodontal treatment — scaling and root planing or periodontal surgery — has been completed and the patient has moved into the maintenance phase. It is not appropriate for a patient who has never had periodontal therapy.

Why three months, and why it is not negotiable

The interval is not arbitrary. The bacterial populations in treated periodontal pockets repopulate over roughly nine to twelve weeks, and the evidence for three-month recall in treated periodontitis patients is strong: those who keep to it lose substantially fewer teeth over decades than those who drift back to six monthly visits. This is where the benefit design fights the clinical need. Most plans cover two cleanings or maintenance visits per year, and many count prophylaxis and periodontal maintenance against that same allowance of two. A patient who needs four visits a year is therefore paying for two of them. Some plans do cover four maintenance visits annually for documented periodontal patients, and it is worth checking rather than assuming.

Going back to a regular cleaning

Patients often ask when they can return to D1110. The technically correct answer is usually never: periodontitis is a managed condition, the attachment that was lost does not grow back, and the sites that were diseased remain the sites at risk. Alternating between maintenance and prophylaxis — which some offices do to work around benefit limits — is not clinically coherent, and some plans specifically disallow it. What can change is the interval. A stable patient with good home care may reasonably move from three months to four.