D4241 is the CDT code for lifting a gum flap to clean the root surfaces of one to three adjacent teeth or tooth gaps in one quadrant, without reshaping bone.
- When to use: An isolated deep pocket or short run of pockets, one to three contiguous sites in a quadrant, did not resolve with nonsurgical therapy.
- When not to use: Four or more sites is D4240, a flap with bone reshaping is D4261, and cleaning without a flap is D4342.
- Billing note: Many plans downgrade to D4342 when the note reads like a deep cleaning, so document the flap and attach site-specific perio charting.
What D4241 covers
D4241 reports a gingival flap procedure with root planing on one to three contiguous teeth or tooth-bounded spaces within a single quadrant. The dentist raises a soft-tissue flap to reach the root surfaces and the pocket, removes granulation tissue, planes the roots clean under direct vision, and closes the flap. The root planing is part of the procedure and the fee. It is the same technique as D4240, applied where only one, two, or three adjacent sites in the quadrant needed surgical access.
It does not cover:
- The same flap procedure on four or more teeth in a quadrant. That is D4240.
- A flap that also reshapes or removes bone. That is osseous surgery, D4261 (one to three teeth) or D4260 (four or more teeth).
- Nonsurgical scaling and root planing with no flap. That is D4342 (one to three teeth) or D4341 (four or more teeth).
- A gingivectomy or gingivoplasty, which removes or recontours gum tissue rather than raising a flap for root access. That is D4211 (one to three teeth) or D4210 (four or more teeth).
- A separate line for the root planing on the same teeth. It is built into D4241.
When to bill D4241
Bill D4241 when:
- A soft-tissue flap is raised for access on one, two, or three contiguous teeth or tooth-bounded spaces in one quadrant.
- The roots are planed under direct vision and the flap is closed.
- No bone is reshaped or removed.
- The periodontal charting shows an isolated deep pocket or a short run of pockets that nonsurgical therapy did not resolve.
Count per quadrant: D4241 vs D4240
D4241 and D4240 are the same procedure. They differ only in how many contiguous teeth or tooth-bounded spaces in the quadrant were treated.
- D4241: one to three contiguous teeth or tooth-bounded spaces per quadrant.
- D4240: four or more contiguous teeth or tooth-bounded spaces per quadrant.
Gingival flap versus scaling and root planing
The line between a surgical flap and nonsurgical scaling and root planing is what gets D4241 downgraded most often.
- Scaling and root planing (D4342, D4341) cleans the root surfaces below the gumline with no flap raised. It is the nonsurgical phase, done first and re-evaluated.
- Gingival flap with root planing (D4241, D4240) surgically raises a flap so the roots can be cleaned under direct vision when the pockets are too deep for closed instrumentation, then closes it.
If the operative note never mentions raising and closing a flap, the claim reads as scaling and root planing, and a reviewer will reprocess it at the D4342 allowable. The note has to describe the surgical access, not just the cleaning.
Gingival flap versus osseous surgery
On one to three teeth, osseous surgery is D4261. It uses the same flap entry and closure as D4241 but also reshapes or removes bone. If the operative note describes osteoplasty or ostectomy, the procedure is D4261. Coding the flap procedure when bone was recontoured underbills and misstates what was done; coding osseous surgery when no bone was touched invites a denial when the carrier reads the note.
Top reasons D4241 gets denied or downgraded
- Downgrade to scaling and root planing. When the note does not document a flap, many plans reprocess D4241 at the D4342 allowable.
- No nonsurgical phase on file. Plans that require documented scaling and root planing and a re-evaluation before surgery will pend or deny a flap billed without it.
- Frequency limit on the quadrant. A repeat surgical procedure on the same quadrant inside the plan’s window denies for frequency.
- Charting that does not justify opening the tissue. On a one-to-three-tooth claim, the carrier wants to see the specific deep pockets that made surgical access necessary on those sites.
- Count confusion with D4240. A quadrant with four treated sites billed as D4241, or the reverse, gets flagged and reprocessed.
Documentation that supports the claim
The claim needs:
- Recent periodontal charting, usually within six months, showing the pocket depths on the specific teeth that justify a surgical flap. Link it to the claim line, not just the record.
- A diagnosis of periodontitis.
- The one to three teeth treated and the quadrant.
- Radiographs showing the bone loss on those sites.
- Evidence that nonsurgical therapy was done and re-evaluated and that disease remained on those sites.
The operative record should describe the flap elevation and the root planing and state that no bone was reshaped. On a small-span claim the reviewer looks closely at why surgery was needed on just those teeth, so the site-specific charting carries the claim.
Example case
A 49-year-old patient in periodontal maintenance has a 6 mm pocket on tooth #14 and a 5 mm pocket on the adjacent #15 that have not responded to repeated nonsurgical cleaning and localized scaling and root planing. Radiographs show bone loss between #14 and #15 but no defect that calls for osseous recontouring. The periodontist raises a small flap over #14 and #15, planes both exposed root surfaces, and closes. No bone is reshaped.
Billing for the visit:
- Confirm the plan’s periodontal surgery benefit and whether the prior nonsurgical therapy satisfies its prerequisites.
- Report D4241 on the upper left quadrant for teeth #14 and #15, because two contiguous teeth were treated with a flap.
- Do not add D4342 for the same teeth on this date. The root planing is included in D4241.
- Attach the periodontal charting showing the residual pockets on #14 and #15, the diagnosis, and recent radiographs.
- Add a one-line narrative: “Gingival flap with root planing, upper left quadrant, teeth #14 and #15, for residual pockets after nonsurgical therapy. No osseous involvement.”
- If the EOB reprocesses at the D4342 allowable, confirm the flap was clearly documented before deciding whether to appeal.
FAQs
- What is the difference between D4241 and D4240?
- The number of teeth or tooth-bounded spaces treated in the quadrant: one to three for D4241, four or more for D4240. The procedure is otherwise identical, a soft-tissue flap raised for root access and planing with no bone reshaping. A tooth-bounded space, an edentulous gap with a tooth on each side, counts toward the total the same way a tooth does. Count the contiguous treated sites in the quadrant from the perio chart, then pick the code.
- Can I bill D4241 for one tooth?
- Yes. D4241 covers one to three contiguous teeth or tooth-bounded spaces in a quadrant, so a single tooth that needs a surgical flap for root access falls under this code. The claim should identify the tooth and the quadrant and carry periodontal charting showing the pocket depth that justifies opening the tissue on that site.
- What is the difference between a gingival flap and osseous surgery on one to three teeth?
- Whether bone is reshaped. Osseous surgery on one to three teeth is D4261, which reshapes or removes the bone around the teeth. The gingival flap, D4241, raises a flap for root access and cleaning and leaves the bone alone. If the operative note describes osteoplasty or ostectomy, it is D4261; if it stops at flap access and root planing, it is D4241. Carriers read the note to confirm the code.
- Is D4241 the same as scaling and root planing?
- No. Scaling and root planing, D4342 for one to three teeth, is nonsurgical and raises no flap. D4241 is a surgical procedure that opens a soft-tissue flap to reach roots that could not be cleaned by closed instrumentation. The root planing is included in D4241, so you do not also bill D4342 on the same teeth on the same day. Many plans also expect completed nonsurgical therapy before they consider the surgical flap.
- Why was D4241 downgraded or denied?
- Usually because the documentation did not show a flap was raised, so the plan reprocessed it as scaling and root planing, D4342. Other common reasons are a missing nonsurgical phase, because many plans want SRP tried and re-evaluated first, and frequency limits on the quadrant. All of these are plan-dependent, so verify the periodontal benefit and make the operative note describe the flap and the root planing.
Related codes
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CDT codes are maintained by the American Dental Association. This page is an editorial billing guide, not the official ADA code descriptor. Verify current coverage policies with each carrier before submitting claims.