D4346 vs D4341 vs D4342: choosing the right scaling code

D4346 is the full-mouth scaling code for generalized moderate or severe gingival inflammation with no attachment loss and no bone loss. D4341 and D4342 are periodontal scaling and root planing, reported per quadrant once the dentist diagnoses periodontitis: D4341 when four or more teeth in the quadrant need it, D4342 when one to three do. D1110, the adult prophylaxis, covers a healthy mouth or gingivitis in a few spots. D4355 is a full mouth debridement that makes a later evaluation possible. The diagnosis picks the code. How long the cleaning took does not.

The diagnosis is the dentist's; the hygiene team and front desk own the chart, the next appointment, the patient conversation, and the questions to the plan. CDT is the American Dental Association's code set, and code names here are paraphrased; the ADA's CDT Code page and the current manual are the authority. The CDT codes glossary entry covers how the code set is organized.

What is the difference between D4346 and D4341?

Attachment loss decides it: D4346 treats inflamed gums where the bone and the gum's attachment to the tooth are still intact. D4341 and D4342 treat periodontitis, where attachment has been lost, the pockets are true pockets, and the radiographs show bone loss. The ADA added D4346 in CDT 2017, according to its coding education page, for the patient in between: widespread gum inflammation with no bone or attachment loss. For what counts as generalized, question 6 of the ADA Guide to Reporting D4346 borrows the American Academy of Periodontology's cutoff: 30% or more of the teeth.

Two details trip offices up. First, a deep probing number alone does not mean periodontitis. Swollen tissue can probe deep with no attachment loss at all, a pseudo-pocket, and the ADA's SRP claim submission sheet says that condition is reported as a prophylaxis or as D4346, not as SRP. Second, a slow or heavy cleaning is not D4346. The D4346 guide says extra time on its own does not qualify a visit.

Scope differs too. D4346 is reported once, for the full mouth. D4341 and D4342 are reported per quadrant, so one mouth can carry D4341 on the lower left and D4342 on the upper right.

Which scaling code fits the findings?

Each row pairs a finding with its code and the chart support that holds up when a plan asks.

The two prophylaxis-plus-SRP rows surprise people. SRP covers the teeth with bone loss, by quadrant; the prophylaxis covers the rest. The ADA's D4346 guide charts a prophylaxis plus SRP as applicable for bone loss, localized or generalized. If every tooth is being root planed, there is no prophylaxis to report. When some teeth are left over, whether the plan pays a prophylaxis on the same date is a question for the plan. D4346 is not reported with a prophylaxis, SRP, or debridement. For SRP only, the guide allows an exceptional claim with a narrative, and says it may not be paid.

The documentation checklist

Before an SRP claim goes out, a second person should be able to confirm these. The list follows the ADA's SRP claim sheet, which notes that D4341 and D4342 are not by-report codes, yet carriers ask for support anyway.

• A complete periodontal chart. Probing depths at six sites around each affected tooth, with attachment loss and bleeding on probing recorded, not just the deepest number.
• Radiographs that show bone levels. Diagnostic quality, labeled, taken before the treatment planning visit. The ADA sheet prefers bitewings or a full series and says not to send a panoramic image.
• A narrative stating the diagnosis. Periodontitis, in the dentist's words, with the treatment plan by quadrant.
• A narrative for four quadrants in one visit. Sedation, special needs, and transportation barriers are among the reasons the ADA lists. Some plans will not pay four quadrants on one date regardless.

What happens after each code?

This is where money leaks: the code is posted correctly, and then nothing gets booked.

SRP that was diagnosed and not scheduled is unscheduled treatment, the same as an unbooked crown, and easy to miss because the patient was just in the chair. Book every quadrant at diagnosis, and find the ones that slipped the way you find any other diagnosed work: in OpenDental, the Treatment Finder report lists planned procedures with no appointment. A patient who declines to book goes onto a treatment plan follow-up cadence with a named owner.

The ADA's guide says there is no set waiting period before a patient treated with D4346 returns to routine prophylaxis; the dentist decides when. It also says D4346 is not followed by periodontal maintenance, because no attachment was lost. After SRP, the patient moves to periodontal maintenance; the recall section of the D4910 vs D1110 guide covers switching the recall type in OpenDental.

How do you explain it to a patient who expected a regular cleaning?

The patient booked a cleaning, so the cost conversation happens before scaling starts, not at checkout. Once the dentist confirms D4346 or SRP, the hygienist pauses. The front desk quotes the fee from the patient's fee schedule (the in-network fee when the office participates) and the plan's share if benefits were verified, or says that share is unconfirmed. The patient agrees to the procedure and the cost first. Checkout only confirms and books the next visit. The names are illustrative.

For D4346, the hygienist in the chair:

"Your gums are inflamed in a lot of places, more than a regular cleaning can settle, and they bleed when I measure. The good news is the bone looks healthy. Dr. Patel wants a more thorough cleaning today to bring the inflammation down, and once it settles, she'll tell you when you can go back to regular cleanings."

For SRP, the hygienist in the chair:

"In these areas the gum has pulled away from the tooth, and the x-ray shows some bone loss. A regular cleaning only reaches above that. Dr. Patel wants to clean below the gumline in those sections. After that, you'll come in a little more often so we can keep it stable."

Before treatment starts, the front desk, if the plan was checked:

"What Dr. Patel recommended today is a different procedure than a regular cleaning, so your insurance may treat it differently. Here is what we found when we checked, and what your part would be. Are you comfortable going ahead?"

If it was not: "We haven't confirmed how your plan handles this one. Your fee for it is on this estimate. We can check with the plan and book it for another day, or go ahead today and you cover whatever part of that fee the plan doesn't pay."

At checkout, if the treatment is in sections: "Let's book the next one now while the good times are open."

If the patient says no, log the decline and the reason for whoever makes the follow-up call.

The code is the dentist's call. Whether the next visit is on the calendar before the patient reaches the parking lot is the team's.

What should you ask the plan before the claim goes out?

Frequencies, coverage, and documentation rules vary by plan. The ADA's D4346 guide says the best way to learn how a plan treats the code is to ask the carrier, for example with a predetermination. These are the questions, not the answers:

Put the answers on the verification form so nobody asks twice. The dental insurance verification workflow already has a line for whether periodontal maintenance shares a frequency with prophylaxis; add the D4346 and SRP questions beside it for patients whose last chart showed inflammation or pocketing.

One office or twenty: where the follow-through lives

A single office can run all of this with the tables above and one person who owns the unscheduled SRP list each week. Across several offices, it is hard to see which hygiene teams are booking the second visit without someone pulling reports office by office.

That follow-through is what we built Patient Outreach for. MyDentalForce builds one ranked daily call list per office from that office's own OpenDental, rebuilt every morning, covering due and overdue hygiene recall, unscheduled treatment (including SRP planned and never booked), and lapsed patients. Every call outcome is logged and written back to the practice management system. A single office's SRP list stops depending on one person remembering to run the Treatment Finder, and a group's managers see each office's activity and results without asking.

Print the findings table for the hygiene rooms and add the plan questions to your verification form this week. Then run the Treatment Finder for scaling and root planing with no appointment. First quadrants done with the rest waiting are the easiest calls on the list, because the patient already said yes once.