What D3240 means

D3240 covers pulpal therapy with a resorbable filling on a posterior primary tooth, excluding the final restoration. "D" is dental, "32" is the pulpotomy/pulpectomy endodontic group, and "40" is this posterior primary-tooth pulpal therapy. When a baby (primary) back tooth (a baby molar) has pulp that's too affected for a pulpotomy (e.g., the infection/inflammation extends into the radicular/root pulp, so just removing the coronal pulp isn't enough), a more complete pulp treatment is needed — essentially a 'baby root canal.' The pulp is removed from the canals, they're cleaned, and filled with a resorbable material (a filling that breaks down/resorbs over time, importantly as the baby tooth's roots naturally resorb when the permanent tooth comes in). This is for posterior (back) primary teeth — the baby molars. The code excludes the final restoration (coded separately).

So it's a baby root canal on a baby molar — removing the pulp and filling the canals with a resorbable material — so the baby tooth can be kept until it naturally falls out.

The key feature is the resorbable filling: because a baby tooth's roots naturally resorb (dissolve) as the permanent tooth develops and pushes up (allowing the baby tooth to become loose and fall out), the canal filling for a baby tooth must be resorbable too — so it resorbs along with the roots, allowing the normal exfoliation (falling out) of the baby tooth and the eruption of the permanent tooth. This code (D3240) is for posterior (back) primary teeth — the baby molars (the first and second primary molars); D3230 is the equivalent for anterior (front) primary teeth. Baby molars have multiple canals (more than front baby teeth), so this is somewhat more involved than the anterior version. It's distinct from a pulpotomy (D3220, which preserves the radicular pulp). After the pulpal therapy, the baby molar is typically restored with a stainless steel crown (separate). Coverage is under endodontic benefits; documentation supports the claim.

When it's typically used

D3240 is reported for pulpal therapy with a resorbable filling on a posterior primary (baby back/molar) tooth — a baby root canal removing the pulp from the canals and filling them with a resorbable material — when the pulp is too affected for a pulpotomy, so the baby molar can be retained until it naturally falls out. It's distinct from a pulpotomy (D3220) and from the anterior primary equivalent (D3230).

How much does D3240 cost?

Pulpal therapy on a posterior primary tooth is a moderate fee, often roughly 250 to 450 USD depending on region — for the baby root canal on a baby molar (removing the pulp and filling the canals with a resorbable material). It's somewhat more than the anterior version (baby molars having multiple canals). The final restoration (typically a stainless steel crown) is separate.

Is D3240 covered by insurance?

Covered under endodontic benefits for treating a primary tooth (retaining it). Documentation of the pulp condition and the pulpal therapy supports the claim. The final restoration (typically a stainless steel crown, D2930) is coded separately. It's distinct from a pulpotomy (D3220) and is specifically for posterior primary teeth (D3230 for anterior). Verifying coverage helps.

A baby root canal on a baby molar

Pulpal therapy on a posterior primary tooth is a baby root canal on a baby molar, and understanding it clarifies this procedure.

When a baby (primary) back tooth — a baby molar — has pulp that's too affected for a pulpotomy (where only the coronal pulp is removed and the radicular pulp preserved), a more complete pulp treatment is needed. This happens when the infection/inflammation extends into the radicular (root) pulp, so the radicular pulp can't be preserved. The treatment is essentially a 'baby root canal' (pulpal therapy) on the baby molar: the pulp is removed from the canals (both coronal and radicular), the canals are cleaned, and they're filled with a resorbable material. This is analogous to a root canal on a permanent molar (removing the pulp and filling the canals), but adapted for a baby molar (with a resorbable filling). After the pulpal therapy, the baby molar is typically restored with a stainless steel crown.

So a baby root canal on a baby molar treats a baby back tooth whose pulp is too affected for a pulpotomy — removing the pulp from the canals and filling them (with a resorbable material) — so the baby molar can be retained (rather than extracted). This is valuable because retaining the baby molar (until it naturally falls out) preserves its functions — holding space for the permanent tooth (premolar) that will replace it, aiding chewing, and maintaining the arch — so saving a salvageable baby molar (rather than extracting it) helps avoid the issues that premature loss can cause (space loss, alignment problems). Baby molars are particularly important space holders (their early loss can lead to the permanent teeth drifting and crowding), so saving them when feasible is valuable. The dentist performs a baby root canal on a baby molar when its pulp is too affected for a pulpotomy but the tooth can be saved. For patients (parents), understanding that pulpal therapy on a baby molar is a baby root canal — removing the pulp from the canals and filling them (with a resorbable material), when the pulp is too affected for a pulpotomy — clarifies this procedure. It saves a baby molar with more extensive pulp involvement. The dentist performs it to retain the tooth. Understanding this helps parents see that a baby root canal on a baby molar treats a back baby tooth whose pulp is too affected for a pulpotomy — removing the pulp and filling the canals (with a resorbable material) — so the baby molar can be retained until it naturally falls out, preserving its important space-holding and functional role, rather than extracting it.

Why the filling must be resorbable

The resorbable filling is the key feature, and understanding why clarifies this baby-tooth adaptation.

The defining feature of this procedure (versus a permanent-tooth root canal) is the resorbable filling — and understanding why it must be resorbable clarifies the baby-tooth adaptation. Baby teeth are temporary: a baby tooth's roots naturally resorb (dissolve away) as the permanent tooth beneath develops and pushes up — this root resorption is what allows the baby tooth to become loose and fall out (exfoliate) at the right time, making way for the permanent tooth. So a baby molar's roots are designed to resorb. If the canals of a baby molar were filled with a non-resorbable material (like the gutta-percha used in permanent teeth), that material wouldn't resorb along with the roots — it could interfere with the normal resorption and exfoliation (potentially preventing the baby tooth from falling out properly, or affecting the permanent tooth's eruption). To avoid this, the canal filling for a baby tooth must be resorbable — so it resorbs along with the roots, allowing the normal exfoliation of the baby tooth and eruption of the permanent tooth.

So the resorbable filling (e.g., materials suited for primary teeth that resorb) is essential for a baby root canal — it lets the treated baby molar still follow its natural course (resorbing and falling out at the right time) rather than being hindered by a non-resorbable filling. This is the key difference from a permanent-tooth root canal (which uses a non-resorbable filling, since permanent teeth don't resorb and are meant to be kept permanently). The dentist uses a resorbable filling for the baby molar's canals. For patients (parents), understanding why the filling must be resorbable — so it resorbs along with the baby molar's naturally-resorbing roots, allowing the tooth to fall out normally and the permanent tooth to come in — clarifies this baby-tooth adaptation. The resorbable filling lets the treated baby molar follow its natural course. The dentist uses it for the baby molar. Understanding this helps parents see that the baby root canal uses a resorbable filling (unlike a permanent-tooth root canal's non-resorbable filling) — because a baby molar's roots naturally resorb as the permanent tooth comes in, so the filling must resorb too, allowing the treated baby molar to fall out normally at the right time without interfering with the permanent tooth's eruption, an essential adaptation for treating a temporary baby tooth.

Anterior vs posterior primary teeth

There are separate codes for front and back baby teeth, and understanding this clarifies the coding.

Pulpal therapy with a resorbable filling has two codes, divided by whether it's a front or back baby tooth. D3240 (this code) is for posterior (back) primary teeth — the baby molars (the first and second primary molars). D3230 is for anterior (front) primary teeth — the baby incisors and canines. So the code depends on whether the baby tooth being treated is a back tooth (D3240) or a front tooth (D3230). This parallels how permanent-tooth root canals are divided by tooth type, though for baby teeth it's a simpler anterior/posterior split.

The distinction reflects differences between front and back baby teeth: back baby teeth (molars) have multiple canals (more than front baby teeth, which usually have one), making the posterior pulpal therapy somewhat more involved than the anterior version (similar to how permanent molars are more complex than permanent front teeth). So the posterior code (D3240) is for the more complex back baby molars (multiple canals), and the anterior code (D3230) for the simpler front baby teeth. The dentist uses the code matching the baby tooth type (posterior or anterior). Both involve the same fundamental procedure (removing the pulp, filling the canals with a resorbable material), applied to a back or front baby tooth respectively. For patients (parents), understanding that there are separate codes for back (D3240) and front (D3230) baby teeth clarifies the coding. The code depends on the baby tooth being a back or front tooth. The dentist uses the appropriate code. Understanding this helps parents see that pulpal therapy on a baby tooth is coded D3240 for a back baby tooth (molar) or D3230 for a front baby tooth (incisor/canine) — the code matching the tooth's position — both being the baby root canal procedure (removing the pulp and filling with a resorbable material), with this code (D3240) specifically for the back baby molars (which have multiple canals, making it somewhat more involved than the front version).

After the pulpal therapy: the crown

A baby molar pulpal therapy is followed by a crown, and understanding this clarifies the complete treatment.

A baby molar pulpal therapy treats the pulp, and the baby molar then needs a final restoration (the code excludes it). For a baby molar, the typical final restoration is a stainless steel crown (D2930) — providing durable, full-coverage protection for the tooth. The reasons: a baby molar that needed pulpal therapy usually had significant decay (reaching the pulp), so much of the tooth's structure may be compromised; and the baby molar, having had the pulp removed, needs robust protection to function (chewing) until it naturally falls out. A stainless steel crown provides this durable, full-coverage protection (more reliable than a filling for such a tooth), helping the baby molar last until exfoliation. So the typical sequence is: pulpal therapy (treat the pulp), then a stainless steel crown (restore and protect the baby molar). The crown is coded separately from the pulpal therapy.

So the pulpal therapy is part of a treatment that includes restoring the baby molar with a crown — the pulpal therapy addressing the pulp, the crown protecting and restoring the tooth. The combination retains the baby molar in function until natural exfoliation. After treatment, the tooth is monitored (at regular dental visits) to confirm it stays healthy and the crown serves well, until the baby molar naturally falls out (with the permanent premolar then erupting). The dentist performs the pulpal therapy and the crown as part of treating the baby molar. For patients (parents), understanding that a baby molar pulpal therapy is followed by a stainless steel crown clarifies the complete treatment. The pulpal therapy treats the pulp; the crown protects the tooth. The dentist does both as part of retaining the tooth. Understanding this helps parents see that a baby molar pulpal therapy is part of a treatment that includes a stainless steel crown — so the baby molar is treated (the pulp) and protected (the crown) — retaining it in function until it naturally falls out, with the pulpal therapy and the crown together preserving the salvageable baby molar, an important space holder, until the permanent tooth is ready to come in.

Frequently asked questions

What is the D3240 dental code?

It's pulpal therapy with a resorbable filling on a posterior (back) primary (baby) tooth — a 'baby root canal' on a baby molar, removing the pulp from the canals and filling them with a resorbable material. It retains a baby molar whose pulp is too affected for a pulpotomy, until it naturally falls out.

What is a baby root canal on a molar?

Pulpal therapy on a baby molar — removing the pulp from the canals and filling them (with a resorbable material), when the pulp is too affected for a pulpotomy. It's analogous to a permanent-molar root canal but adapted for a baby tooth (resorbable filling), to retain it until it naturally falls out.

Why must the filling be resorbable?

Because a baby tooth's roots naturally resorb (dissolve) as the permanent tooth comes in, allowing the baby tooth to fall out. The filling must resorb along with the roots — a non-resorbable filling could interfere with the normal exfoliation and the permanent tooth's eruption. So a resorbable material is used.

What's the difference from D3230?

D3240 is for posterior (back) primary teeth (baby molars, which have multiple canals — somewhat more involved), and D3230 is for anterior (front) primary teeth (incisors and canines, usually one canal). The code depends on whether the baby tooth is a back or front tooth.

How much does it cost?

Often around 250 to 450 USD for the baby root canal on a baby molar (removing the pulp and filling the canals with a resorbable material), somewhat more than the anterior version (baby molars having multiple canals). The final restoration (typically a stainless steel crown) is separate.

What happens after the pulpal therapy?

The baby molar is typically restored with a stainless steel crown (D2930) — durable, full-coverage protection so the tooth functions until it naturally falls out. So the pulpal therapy (treating the pulp) plus a crown (protecting the tooth) retains the baby molar. The crown is coded separately.

This page is an independent, plain-language explanation for general information only. It is not billing, coding, or clinical advice. For the official CDT descriptor and current-year wording, refer to the American Dental Association.