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 and the diseased tissue around it, and closes. It treats a periapical lesion on a tooth that has already had root canal therapy, or one whose apex cannot be reached from inside the canal.

Included in the code:

• Curettage. Cleaning out and irrigating the bony defect at the surgical site is part of the procedure, with no separate line.
• Suture removal. It has no CDT code of its own, though the post-operative visit can be reported with D0171 when the plan recognizes it.

Not included, and billed separately when done:

• The root-end filling. D3430, per root. The apicoectomy descriptor says 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 with periradicular surgery; D3431 is biologic material used for the same purpose.
• The root canal itself, 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 first. Root count only matters after that, and reading it in the wrong order produces the miscodes.

• D3410, anterior. One code, one tooth, with no first-root qualifier.
• D3421, premolar, first root. Reports one root. Older CDT editions called these teeth bicuspids, and many carrier policies still use that word, so search both terms when looking up a payer’s rule.
• D3425, molar, first root. Reports one root.
• D3426, each additional root. An add-on that depends on a base code being on the claim, the same way the timed sedation increments depend on a first increment.

D3421 and D3425 both say “first root” and point to D3426 when more than one root is treated. D3410 does neither, which is why a routine anterior case is one surgical line and a routine molar case is two or three. A three-rooted upper molar with all three root ends resected 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 alone.

The two-rooted anterior

Mandibular incisors occasionally have two roots, and the codebook does not directly address that case. D3426’s descriptor presents it as typical of premolar and molar surgery, which describes the usual case without forbidding others, and its nomenclature is not limited by tooth type. On the other side, D3410 is the one base code with no first-root qualifier and no cross-reference to the add-on.

Treat it as a documented exception. Send the operative note and a radiograph showing both roots resected. If the add-on is rejected, the codebook’s route 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, excludes retrograde filling material. The filling is D3430, and its unit is the root sealed, not the filling placed. If two fillings go into one root, the codebook sends the case to D3999 with a description instead of a second unit. The AAE’s coding scenario for an upper first molar with two roots resected and each given a root-end filling reports the molar base code, one additional-root unit, and D3430 twice.

On an anterior tooth that is usually D3410 plus one unit of D3430. Because there is no counting to do on a single-rooted tooth, this is where the D3430 line most often goes missing and the filling is absorbed into the surgical line.

Why the claim needs the retreat-versus-resect answer

Surgical endodontics is reviewed against clinical criteria, and carriers first ask why the tooth was not retreated nonsurgically. UnitedHealthcare’s surgical endodontics policy, DCP010.15, effective May 1, 2026, lists these indications for an apicoectomy:

• Failed retreatment of endodontic therapy, listed first.
• 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.
• Obturating material extended far enough past the apex to interfere with healing.

The same policy says an apicoectomy is not indicated when root or bony configurations prevent surgical access, neurovascular structures may be involved, or the tooth has a hopeless prognosis.

That is one carrier’s list, but the pattern is common. The nonsurgical alternative on an anterior tooth is D3346, retreatment of previous root canal therapy. The narrative should name the specific reason retreatment was not the path: it was already attempted and failed, the canal is blocked, or a post makes re-entry destructive. A narrative that only describes the surgery does not answer the reviewer’s question.

Nearby procedures that are not an apicoectomy

These codes get used by mistake because they also involve surgery on a root. They differ in 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 on the remaining roots.
• D3920, hemisection. The tooth is separated through the furcation into sections, each with a root and the crown above it, and one or more sections may be removed. 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, with the root resorption repair codes D3471 through D3473, replaced D3427 in CDT 2021. D3427 still appears in 2026 carrier documents such as Cigna’s DPPO guidelines, so a payer policy naming it is quoting a deleted code.

D3450 and D3920 both require a multi-rooted tooth, so neither applies to an anterior case, but coding the whole surgical block from one mental model misroutes the molar cases. The surgical codes and the rest of the endodontic family are mapped in the root canal dental codes guide.

Documentation that supports the claim

• A preoperative radiograph showing the periapical lesion. The 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 state it in the note.
• The reason nonsurgical retreatment was not chosen. 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 the tooth, including the date of the original root canal, since waiting-period and frequency rules key on it. Store that date where the biller can see it.
• Lesion size, when a graft or regenerative material is on the claim. At least one carrier requires a lesion of one centimeter or larger for those codes.

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

What to get right in your PMS

1. Put the root behavior in the code labels. “Apicoectomy, anterior, per tooth” next to “Apicoectomy, premolar, first root” shows the difference at the moment of selection.
2. Keep D3430 as its own line that accepts multiple units. Don’t build it into the D3410 fee or default it to a quantity of one. If your system supports procedure sets, an anterior apicoectomy set that posts D3410 and D3430 together makes dropping the filling a deliberate act.
3. Tie D3426 to a base code. If your system supports linked procedures, set the additional-root code so it cannot post without D3421 or D3425 on the same date and tooth. That prevents orphan-line rejections and flags the rare anterior case for review.
4. Separate the periradicular graft codes from the periodontal ones. D3428, D3429, D3431, and D3432 belong to periapical surgical sites. D4263, D4264, D4266, and D4267 are periodontal codes that at least one carrier rules out at a surgical root canal site.