D3410 Dental Code: Anterior Apicoectomy Billing Guide

What D3410 covers

D3410 reports surgery on the root of an anterior tooth: the surgeon raises a flap, opens the bone over the root end, removes the apical portion of the root along with the diseased tissue around it, and closes. It is the surgical answer to a periapical lesion on a tooth that has already had root canal therapy, or on one where the apex cannot be reached from inside the canal.

Two things sit inside the code and are not separately reportable. Cleaning out and irrigating the bony defect at the surgical site is treated as part of the procedure, so there is no separate line for curettage. Suture removal at the follow-up visit has no CDT code of its own either, though the post-operative visit itself can be reported with D0171 when the plan recognizes it.

Several things that commonly happen at the same surgery are not inside the code:

• The root-end filling. That is D3430, per root. The apicoectomy descriptor says plainly that retrograde filling material is not included.
• A bone graft at the site. D3428 for the tooth, D3429 for each additional contiguous tooth in the same surgical site. Both include non-autogenous graft material.
• A membrane or biologic material. D3432 is the resorbable barrier placed in conjunction with periradicular surgery; D3431 is biologic material used for the same purpose.
• The root canal itself, if it happens on the same tooth at a separate visit. Anterior endodontic therapy is D3310.

Tooth type first, then root count

The apicoectomy family splits on tooth type, and only after that does root count enter the picture. Reading it in the wrong order is what produces the miscodes.

• D3410, anterior. One code, one tooth. Its nomenclature carries no first-root qualifier.
• D3421, premolar, first root. Reports one root. Older editions of CDT called these teeth bicuspids, and plenty of carrier policies still print that word, so search both terms when hunting a payer’s rule.
• D3425, molar, first root. Reports one root.
• D3426, each additional root. An add-on. It has no standalone meaning and depends on a base code being on the claim, the same way the timed sedation increments depend on a first increment.

The structural detail that decides most of these claims is in the nomenclature itself. D3421 and D3425 both say “first root” and both point you to D3426 when more than one root is treated. D3410 says neither. On an anterior tooth the apicoectomy is written as a single per-tooth service, which is why a routine anterior case generates one surgical line and a routine molar case generates two or three.

So a three-rooted upper molar with all three root ends resected at one surgery is D3425 plus two units of D3426. An upper first premolar with both roots treated is D3421 plus one unit of D3426. A maxillary central incisor is D3410, full stop.

The two-rooted anterior

Anterior teeth are single-rooted almost always, but not quite always, and mandibular incisors occasionally have two. The codebook does not directly address that case. The additional-root code’s descriptor presents it as typical of premolar and molar surgery, which describes the usual case rather than forbidding anything else, and nothing in its nomenclature limits it by tooth type. Pulling the other way, D3410 is the one base code with no first-root qualifier and no cross-reference to the add-on, while its two siblings have both.

Treat it as a documented exception rather than a habit. Send the operative note and a radiograph showing both roots resected with the claim. If the add-on is rejected, the route the codebook uses for procedures its codes do not describe is D3999, unspecified endodontic procedure, reported with a narrative.

The retrograde filling is a separate line

Every code in this family, including the add-on, states that retrograde filling material is not included. The filling is D3430, and its unit is the root.

The per-root unit is more precise than it first reads. D3430 counts roots that received a root-end seal, not fillings placed. If two fillings go into one root, the codebook does not tell you to report two units. It sends that case to D3999 with a description. The AAE’s own coding scenario for an upper first molar, where two of the roots were resected and each received a root-end filling, reports the molar base code, one additional-root unit, and D3430 twice, one unit for each root sealed.

On an anterior tooth, that math is usually simple: D3410 plus one unit of D3430. Simple is exactly why the line goes missing. On a molar claim the biller is already counting roots and the second D3430 gets caught; on a single-rooted anterior there is no counting to do and the filling quietly rides along inside the surgical line where it was never supposed to be.

Why the claim needs the retreat-versus-resect answer

Surgical endodontics is reviewed against clinical criteria, not just paid off a fee schedule, and the criterion carriers lead with is why the tooth was not retreated non-surgically instead. UnitedHealthcare’s surgical endodontics policy, DCP010.15, effective May 1, 2026, lists failed retreatment of endodontic therapy first among the indications for an apicoectomy, followed by an apex that cannot be accessed because of calcification or another anomaly, a suspected perforation or root fracture that requires visualization, persistent symptoms after endodontic therapy that need further diagnosis, and obturating material extended far enough past the apex to interfere with healing. The same policy names cases where an apicoectomy is not indicated: root or bony configurations that prevent surgical access, possible involvement of neurovascular structures, and a tooth with a hopeless prognosis.

That list is one carrier’s, but the shape of it is common, and it tells you what the narrative has to establish. The non-surgical alternative on an anterior tooth is D3346, retreatment of previous root canal therapy. A narrative that names the specific reason retreatment was not the path, whether it was already attempted and failed, or the canal is blocked, or a post makes re-entry destructive, answers the reviewer’s actual question. A narrative that only describes the surgery does not.

Nearby procedures that are not an apicoectomy

Three codes get reached for by mistake because they all involve surgery on a root. The axis separating them is how much of the tooth comes out and whether the crown is cut.

• D3450, root amputation, per root. An entire root is removed from a multi-rooted tooth and the crown stays intact, supported by the remaining roots. Reported per root.
• D3920, hemisection. The tooth is separated through the furcation into sections, each containing a root and the portion of the crown above it, and one or more of those sections may be removed. The codebook draws the boundary directly: if the crown is sectioned, it is hemisection rather than root amputation. It does not include the root canal therapy.
• D3501, surgical exposure of a root surface on an anterior tooth, without apicoectomy or repair of root resorption. The root is exposed, observed, and closed, with no root end taken. D3502 and D3503 are the premolar and molar versions. These, together with the root resorption repair codes D3471 through D3473, replaced the old D3427 in CDT 2021. D3427 still turns up in carrier documents years later, including 2026 editions such as Cigna’s DPPO guidelines, so a payer policy naming it is quoting a code that no longer exists.

Both D3450 and D3920 require a multi-rooted tooth, so neither is a live alternative on an anterior case. They matter here because a practice that codes the whole surgical endodontic block off one mental model will misroute the molar cases.

Documentation that supports the claim

The apicoectomy narrative carries more weight than most, because the claim is reviewed on clinical criteria rather than adjudicated on a code alone:

• A preoperative radiograph showing the periapical lesion. This is the single most-requested attachment on a pended apicoectomy claim. A postoperative image confirming the resection helps on appeal.
• The tooth number and the root or roots treated. Root count is what a carrier audits when additional-root units are on the claim, so it has to be explicit in the note rather than inferred from the tooth.
• The reason non-surgical retreatment was not the chosen path. Failed prior retreatment, an inaccessible or calcified apex, a suspected fracture or perforation, or persistent symptoms after endodontic therapy.
• The operative note, covering the flap, the amount of root end resected, whether a root-end filling was placed and in which root, and any graft or membrane material with its quantity.
• The endodontic history on that tooth, including the date of the original root canal therapy, since waiting-period and frequency rules key on it.
• Lesion size, when a graft or regenerative material is on the claim. At least one carrier conditions those codes on a lesion of one centimeter or larger.

What to get right in your PMS

The menus differ across Open Dental, Dentrix, Eaglesoft, Curve, and Carestream, but the setup that prevents these denials is the same:

1. Label the three base codes by tooth type, and put the root behavior in the label. “Apicoectomy, anterior, per tooth” next to “Apicoectomy, premolar, first root” makes the structural difference visible at the moment of selection instead of two weeks later on a rejection.
2. Keep D3430 as its own line item and let it take multiple units. A template that defaults every procedure to a quantity of one undercounts every multi-rooted case, and a fee schedule that quietly rolls the root-end filling into the surgical fee loses the line entirely.
3. Do not build D3430 into the D3410 fee. This is the specific error the anterior code invites, because the single-root case never forces anyone to count. If your system supports procedure sets, build an anterior apicoectomy set that posts D3410 and D3430 together, so dropping the filling becomes a deliberate act.
4. Tie D3426 to a base code. If your system supports linked or dependent procedures, set the additional-root code so it cannot post without D3421 or D3425 on the same date and tooth. That kills the orphan-line rejection and flags the rare anterior case for a human to look at.
5. Separate the periradicular graft codes from the periodontal ones in the pick list. D3428, D3429, D3431, and D3432 belong to periapical surgical sites. D4263, D4264, D4266, and D4267 are periodontal codes that at least one carrier explicitly rules out at a surgical root canal site. Adjacent numbers, different site families.
6. Store the original endodontic treatment date where the biller can see it. Waiting-period and frequency edits key on the date of the root canal on that tooth, and reconstructing it from the chart at appeal time is slower than reading it off the claim screen.

For how the procedure lines, units, and remarks field are filled in on the claim itself, see the ADA dental claim form guide.