D4346 Dental Code Cost in 2026: Scaling for Gingival Inflammation

What D4346 is

D4346 is the CDT procedure code for "scaling in presence of generalized moderate or severe gingival inflammation, full mouth, after oral evaluation". It is a therapeutic cleaning for patients whose gums are widely inflamed (red, swollen, and bleeding on probing) but who do not yet have periodontitis: no clinical attachment loss and no bone loss on X-rays. The defining word is "generalized" — the inflammation must affect a substantial portion of the mouth, commonly cited as roughly 30% or more of the teeth, rather than one or two isolated areas.

The American Dental Association introduced D4346 in 2017 to fill a long-standing gap in the cleaning codes. Before 2017, a patient with widespread gingivitis was an awkward fit: too inflamed for a routine prophylaxis (D1110), but without the pocket depth and bone loss that justify scaling and root planing (D4341/D4342). Dentists either under-coded the visit as a prophy or over-coded it as SRP. D4346 created an accurate middle code: a full-mouth therapeutic scaling for gingivitis, billed once per visit. The American Dental Association publishes guidance on the code's intended use.

Because D4346 is defined by generalized inflammation, it is a single full-mouth code: one fee, regardless of how many teeth are treated. This is different from scaling and root planing, which is billed per quadrant and can generate up to four separate fees for a full mouth. It is also why D4346 costs far less than full-mouth SRP. This page is a cost reference, not clinical advice; the decision to perform D4346 is between you and your dentist.

The three codes side by side

D4346 sits between the routine cleaning and the deep cleaning. The cleanest way to understand it is to see all three on one row. The dividing line is the state of your gums and bone, documented in periodontal charting.

2026 cost of D4346

Cash range for D4346 in 2026: $100 to $300, with a typical figure around $185. These are our estimates anchored to FAIR Health Consumer claims medians and published practice fee ranges; the ADA discontinued its national fee survey in 2023, so no survey percentiles exist for 2026. Higher-cost metros (New York, San Francisco, Los Angeles, Boston) run toward $250 to $300; rural and Deep South practices run $100 to $170; the Midwest and South Central US sit in the middle. The fee is set above a routine prophylaxis because the procedure requires more chair time and instrumentation to remove deposits from inflamed, tender tissue.

Unlike full mouth debridement (D4355), which is normally allowed once per patient per dentist per lifetime, D4346 can recur: a patient who develops generalized gingivitis again later may have D4346 performed again, subject to whatever frequency limit the plan applies. It is also unlike scaling and root planing in that D4346 patients, having no bone loss, generally return to the standard six-month routine cleaning interval after the inflammation resolves rather than moving to indefinite three-to-four-month periodontal maintenance.

Insurance coverage: the inconsistent part

D4346 is the cleaning code most likely to surprise an insured patient, because carriers handle it inconsistently. Some PPO plans cover it as a basic service at 80% after the deductible; some cover it as a preventive service at 100%; some deny it and reprocess the claim as a routine prophylaxis (D1110), paying only the prophy allowance and leaving you to pay the gap; and some newer-code-averse plans exclude it entirely. The table below shows the common outcomes.

Two things protect you. First, ask the office to verify D4346 coverage and frequency with your carrier before the visit, not after. Second, know the same-day rule: D4346 and a routine prophylaxis (D1110) cannot be billed on the same date of service for the same patient, because they are mutually exclusive treatments of the same tissue. If you see both on the same day's claim, question it.

When D4346 is the right code (and when it is not)

D4346 is appropriate when periodontal charting shows generalized moderate-to-severe gingival inflammation — bleeding on probing across much of the mouth — with no pockets deep enough and no bone loss to diagnose periodontitis. It is not appropriate as a routine recall cleaning for a patient with healthy gums (that is D1110), and it is not a substitute for scaling and root planing once true periodontitis is documented (that is D4341/D4342). A patient who genuinely has periodontitis should not be billed D4346 instead of SRP, and a patient with healthy gums should not be billed D4346 instead of a prophy.

If you receive a treatment plan that recommends D4346, you are entitled to see the periodontal chart and ask which teeth show the inflammation that justifies the code. As with any cleaning-vs-deep-cleaning recommendation, a second opinion at a non-chain practice or a dental school clinic (paying for an exam, $85 to $150 cash) is your patient right if the recommendation feels uncertain. See our scaling and root planing page for the periodontitis code that sits one step up, and our deep cleaning page for the full picture.

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