D4346 Dental Code: Scaling for Gingival Inflammation

What D4346 reports

D4346 reports a full-mouth therapeutic scaling for a patient with generalized moderate to severe gingival inflammation whose bone and attachment are intact. The work removes plaque, calculus, and stain from tooth surfaces above and below the gumline to treat active inflammation, not to maintain a healthy mouth.

Two conditions have to be true together. The inflammation is generalized (widespread across the mouth, not one or two isolated spots) and moderate to severe (swollen, bleeding tissue, not a little marginal redness). And there is no bone loss and no attachment loss, which keeps the case out of periodontitis and the SRP codes. The code is for the patient too inflamed for a routine cleaning but without the bone destruction that defines periodontal disease.

The clinical threshold that defines the code

D4346 sits between two more familiar codes.

On the lighter side is the routine prophylaxis (D1110 for adults, D1120 for children), preventive maintenance for healthy gums or mild, localized gingivitis. D4346 is therapeutic, and most educators and carriers anchor “generalized” to bleeding on probing at roughly 30% or more of the teeth. Below that, with only scattered or mild inflammation, the visit is a prophy.

On the heavier side is scaling and root planing (D4341 and D4342), which treats periodontitis: bone loss visible on radiographs and clinical attachment loss, with deliberate instrumentation of the exposed root surfaces. With D4346, the pockets are inflammatory, not the result of attachment destruction, and the bone support is intact.

Why it’s a single full-mouth code

D4346 is reported once for the entire mouth, never per quadrant or per tooth. The SRP codes are the opposite: D4341 for a quadrant with four or more affected teeth, D4342 for one to three, up to four quadrants. D4346 is one line for the whole-mouth treatment, however many teeth were scaled.

A claim that reports D4346 four times, or with a quadrant designation, signals a misunderstanding of the code and draws scrutiny.

The oral evaluation has to come first

The CDT descriptor builds the exam into the code. D4346 is reported after a dentist has examined the patient, assessed the periodontium, and determined that the generalized inflammation warrants therapeutic scaling rather than a prophy.

In practice, an evaluation (D0120 periodic or D0150 comprehensive) with periodontal charting and current radiographs supports the claim. It establishes the two facts the code depends on: the inflammation is generalized and moderate to severe, and there is no bone loss. D4346 with no documented evaluation behind it leaves the central clinical judgment unrecorded.

The evaluation and D4346 are separate procedures and can be reported on the same date when both were performed.

What you cannot bill alongside D4346

• A prophylaxis on the same day. D4346 already scales the full mouth above and below the gumline, so D1110 or D1120 on the same date covers the same surfaces twice. It denies and can read as unbundling.
• SRP on the same teeth. D4346 and D4341/D4342 describe mutually exclusive conditions: no bone loss versus bone loss. A claim carrying D4346 and SRP together on the same arch invites a denial and a records request.

Documentation that supports the claim

Carriers that cover D4346 want the generalized inflammation and the absence of bone loss spelled out, because those two facts separate it from a prophy on one side and SRP on the other. The chart, and the claim where the carrier accepts attachments, should capture:

• Periodontal charting. Probing depths and the distribution of inflammation across the mouth, showing the condition is generalized rather than localized.
• Bleeding on probing. A recorded BOP percentage is the single most useful data point, since many carriers anchor coverage to roughly 30% or more of the teeth.
• No bone loss and no attachment loss. Current radiographs and a note confirming intact bone support.
• The oral evaluation. That a dentist examined the patient and determined therapeutic scaling was indicated.
• A short narrative. One or two sentences: generalized moderate-to-severe gingival inflammation, BOP percentage, no radiographic bone loss, full-mouth therapeutic scaling performed.

A generic “gums inflamed, scaling done” note does not carry this code. Make sure the charting, BOP findings, and no-bone-loss note travel with the D4346 line, not only in the clinical record.

Coverage reality: verify, don’t assume

Coverage for D4346 varies more than for a routine prophy. Some plans cover it with documentation. Some don’t recognize the code at all or fold it into the prophy benefit, and the patient may owe the difference or the full fee depending on plan language and network status. Frequency rules differ too: a plan might allow it once in a benefit period or count it against the same frequency as a prophy.

Before treatment, ask specifically about D4346 coverage, frequency, and the documentation standard, including the bleeding-on-probing threshold, which covering carriers often write into policy at around 30% of teeth. Submitting charting below the plan’s stated threshold is a predictable denial. Where the plan doesn’t cover it and patient billing is allowed, give the patient the out-of-pocket number before the appointment.

After D4346: what recare looks like

Once the inflammation resolves, a D4346 patient typically returns to routine prophylaxis (D1110 or D1120), often on a tightened recall interval of three or four months while the tissue stabilizes, then a standard schedule.

The follow-up is not periodontal maintenance. D4910 is the recare path after SRP for a patient who lost attachment, and a D4346 patient did not. Putting a D4346 patient on a D4910 recall claims a periodontal-maintenance history the chart doesn’t show, and a carrier reviewing the sequence will see the mismatch.