What is the difference between D3222 and D3220?

Two axes: how much pulp comes out, and why. D3220, the therapeutic pulpotomy, removes all of the pulp inside the crown down to the dentinocemental junction and medicates the root pulp, and its descriptor states outright that it is not to be used for apexogenesis. D3222 removes only a portion of the pulp, and its stated aim is exactly apexogenesis: keeping the remaining pulp vital on a permanent tooth with incomplete root development so the root can keep growing and the apex can close. If the tooth is immature and the goal is continued root formation, D3222 is the only code of the two that fits; billing D3220 there contradicts the descriptor you are billing under.

Can D3222 be billed on a primary tooth or a fully developed permanent tooth?

No on both. The nomenclature restricts the code to a permanent tooth with incomplete root development. A primary tooth needing pulp therapy goes to D3220 or the primary-tooth pulpal therapy codes, and a mature permanent tooth has no root left to develop, so apexogenesis is not a coherent treatment goal there. That case is a pulp cap, a therapeutic pulpotomy, or root canal therapy depending on the diagnosis. At least one published carrier guideline enforces the axis mechanically, limiting the benefit to teeth with radiographically incomplete roots.

Is D3222 the first stage of a root canal?

No, and the descriptor says so directly: the procedure is not to be construed as the first stage of root canal therapy. The treatment goal is the opposite of a root canal: the pulp is kept alive so the root can finish forming. That exclusion has billing consequences. Hawaii Dental Service's published endodontic guidelines, as one example, make the partial pulpotomy not billable to the patient when root canal therapy or apexification (D3351–D3353) is performed by the same office; the pulpotomy fee folds into the definitive treatment. If the plan from the start is a root canal and the pulp is being removed for pain relief in the interim, the code for that visit is D3221, pulpal debridement, not D3222.

If the pulp later dies anyway, what codes apply then?

The case moves to a different family, and the choice depends on how far the root got. If the root matured enough for conventional treatment, it is standard endodontic therapy: D3310, D3320, or D3330 by tooth type. If the apex is still open and the pulp is necrotic, the options are apexification (D3351 for the initial visit, with D3352 interim visits and D3353 completion) to induce a hard-tissue barrier at the apex, or pulpal regeneration (D3355 initial, D3356 interim, D3357 completion). Note the bundling risk on timing: a plan that folds the pulpotomy into subsequent endo when both come from the same office will apply that rule regardless of the clinical honesty of the sequence, so verify how the plan in hand handles a failed apexogenesis case.

What documentation supports a D3222 claim?

The open apex is the coverage condition, so a pre-operative radiograph showing incomplete root development is the load-bearing attachment. Beyond that: the tooth number, the diagnosis (traumatic exposure or deep caries with vital pulp), a note that only a portion of the pulp was removed with the remainder left vital, the medicament placed, and the stated goal of continued root development. Chart the follow-up plan too: apexogenesis is monitored over months with periodic radiographs, and those later films are what prove the treatment worked if the claim is ever audited.

D3222 Dental Code: Partial Pulpotomy for Apexogenesis

D3222 is the CDT code for removing a small portion of the pulp on a permanent tooth whose root is still forming, then medicating the rest so it stays vital and the root can finish developing.

Bill the wrong pulpotomy code on a traumatized young tooth and the claim contradicts itself: D3220's descriptor explicitly forbids using it for apexogenesis, which is the entire purpose of this procedure. D3222 exists for one clinical corner, a vital permanent tooth, usually a kid's incisor after trauma or a young molar with deep caries, whose apex is still open. The incomplete root development in its nomenclature is a coverage condition. Carriers that publish guidelines for the code make radiographic proof of the open apex the thing the benefit turns on, and bundle the code away entirely if root canal therapy follows too soon from the same office.

On this page

What D3222 covers
The axis against D3220: depth and intent
The bundling trap: what happens near a root canal
When the pulp isn’t vital: the neighbor procedures
Building the claim
FAQs

What D3222 covers

D3222 reports a partial pulpotomy on a permanent tooth whose root has not finished forming: a small portion of exposed or inflamed pulp is removed, the wound is dressed with a medicament, and the remaining pulp is left vital on purpose. The purpose is apexogenesis: the tooth’s own pulp finishes building the root, lengthening it and closing the apex, which a dead tooth cannot do. The descriptor adds one boundary in plain terms: the procedure is not to be construed as the first stage of root canal therapy.

The typical patients are young. A nine-year-old fractures a central incisor on a playground and exposes vital pulp; a twelve-year-old’s first molar has deep caries reaching a pulp that is still healthy. In both, the root walls are thin and the apex is wide open, and removing the pulp entirely would freeze the root at that stage: thin-walled, fracture-prone, and hard to treat forever after. The partial pulpotomy trades a small amount of tissue for the chance to let the root finish.

What the code is not: it is not the primary-tooth pulpotomy workhorse (that world belongs to D3220 and the primary pulpal-therapy codes), not an emergency pain visit (D3221, pulpal debridement), and not a pulp cap; D3110 covers medicament over an exposure with no pulp tissue removed at all.

The axis against D3220: depth and intent

The pulpotomy pair is a genuine two-axis distinction, and both axes have to point at D3222 before you bill it:

How much pulp is removed. D3220 takes all of the coronal pulp, down to the dentinocemental junction. D3222 takes a portion, typically just the surface layer of inflamed tissue at the exposure, and deliberately leaves the rest of the coronal pulp in place.
Why. D3220’s aim is preserving the root pulp of a tooth (overwhelmingly a primary molar) until exfoliation or restoration. D3222’s aim is apexogenesis: continued physiological root formation on an immature permanent tooth.

The codebook then closes the door on mixing them: the D3220 descriptor states it is not to be used for apexogenesis. That sentence was added specifically to push apexogenesis cases onto this code, and it makes D3220-for-an-open-apex not a judgment call but a descriptor conflict. A carrier that reviews the chart on a young permanent tooth can recode or deny the claim on the descriptor alone.

The bundling trap: what happens near a root canal

The not-first-stage-of-root-canal sentence is where the money moves. Two situations look similar in the chair and bill completely differently:

The pulpotomy is the definitive treatment. Vital immature tooth, pulp preserved, root left to develop, follow-up scheduled. That is D3222, billed on its own.
The pulp is being removed ahead of planned endo. The tooth is headed for a root canal and this visit is pain control or interim management. That is D3221, pulpal debridement, or palliative treatment, not D3222, and not D3220 either.

Carriers enforce the boundary with bundling rules rather than trust. Hawaii Dental Service’s published endodontic guidelines make the partial pulpotomy not billable to the patient when root canal therapy or the apexification codes D3351–D3353 are performed by the same dentist or office; the pulpotomy fee disappears into the definitive procedure. The window and mechanics of that rule are plan-dependent, but the shape is common: a D3222 followed shortly by same-office endo on the same tooth reads to a payer as a root canal that was started under the wrong code. When apexogenesis genuinely fails and endo becomes necessary, the chart’s monitoring record, the serial radiographs showing why the plan changed, is what separates a failed vital-pulp therapy from a miscoded staged root canal.

When the pulp isn’t vital: the neighbor procedures

D3222 requires living pulp, because dead tissue cannot build a root. The immature permanent tooth with a necrotic pulp belongs to two different ladders:

Apexification: D3351 (initial visit), D3352 (interim medication replacement), D3353 (final visit, including the completed root canal). Medication induces a calcified barrier at the open apex so a conventional fill has something to seal against. The root does not grow further; the apex is closed artificially.
Pulpal regeneration: D3355 (initial), D3356 (interim), D3357 (completion, excluding final restoration). The regenerative alternative that attempts to restore vitality in the canal.

The distinction from D3222 is the starting tissue: apexogenesis continues a live root’s development, apexification and regeneration rescue a dead one. If the root has already matured by the time endo is needed, the case is ordinary root canal therapy: D3310, D3320, or D3330 by tooth type.

Building the claim

Confirm the coverage condition on film. The pre-op radiograph showing the open apex is the attachment the benefit turns on; submit it with the claim rather than waiting for the pend.
Bill D3222 with the permanent tooth number. The code does not apply to primary teeth, and a claim edit that checks code-to-dentition consistency will bounce a letter-coded tooth.
Write the note to the descriptor: portion of pulp removed, remainder vital, medicament placed, goal of continued root development. Avoid any phrasing that frames the visit as the start of endo.
Bill the restoration separately under the appropriate restorative code; the pulpotomy code does not include the final restoration.
Verify the plan’s bundling window before any later endo on the same tooth from your office, and keep the follow-up radiographs in the chart; they are both the clinical monitor and the audit defense.

For where attachments and narratives go on the form, see the ADA dental claim form guide.

FAQs

What is the difference between D3222 and D3220?: Two axes: how much pulp comes out, and why. D3220, the therapeutic pulpotomy, removes all of the pulp inside the crown down to the dentinocemental junction and medicates the root pulp, and its descriptor states outright that it is not to be used for apexogenesis. D3222 removes only a portion of the pulp, and its stated aim is exactly apexogenesis: keeping the remaining pulp vital on a permanent tooth with incomplete root development so the root can keep growing and the apex can close. If the tooth is immature and the goal is continued root formation, D3222 is the only code of the two that fits; billing D3220 there contradicts the descriptor you are billing under.
Can D3222 be billed on a primary tooth or a fully developed permanent tooth?: No on both. The nomenclature restricts the code to a permanent tooth with incomplete root development. A primary tooth needing pulp therapy goes to D3220 or the primary-tooth pulpal therapy codes, and a mature permanent tooth has no root left to develop, so apexogenesis is not a coherent treatment goal there. That case is a pulp cap, a therapeutic pulpotomy, or root canal therapy depending on the diagnosis. At least one published carrier guideline enforces the axis mechanically, limiting the benefit to teeth with radiographically incomplete roots.
Is D3222 the first stage of a root canal?: No, and the descriptor says so directly: the procedure is not to be construed as the first stage of root canal therapy. The treatment goal is the opposite of a root canal: the pulp is kept alive so the root can finish forming. That exclusion has billing consequences. Hawaii Dental Service's published endodontic guidelines, as one example, make the partial pulpotomy not billable to the patient when root canal therapy or apexification (D3351–D3353) is performed by the same office; the pulpotomy fee folds into the definitive treatment. If the plan from the start is a root canal and the pulp is being removed for pain relief in the interim, the code for that visit is D3221, pulpal debridement, not D3222.
If the pulp later dies anyway, what codes apply then?: The case moves to a different family, and the choice depends on how far the root got. If the root matured enough for conventional treatment, it is standard endodontic therapy: D3310, D3320, or D3330 by tooth type. If the apex is still open and the pulp is necrotic, the options are apexification (D3351 for the initial visit, with D3352 interim visits and D3353 completion) to induce a hard-tissue barrier at the apex, or pulpal regeneration (D3355 initial, D3356 interim, D3357 completion). Note the bundling risk on timing: a plan that folds the pulpotomy into subsequent endo when both come from the same office will apply that rule regardless of the clinical honesty of the sequence, so verify how the plan in hand handles a failed apexogenesis case.
What documentation supports a D3222 claim?: The open apex is the coverage condition, so a pre-operative radiograph showing incomplete root development is the load-bearing attachment. Beyond that: the tooth number, the diagnosis (traumatic exposure or deep caries with vital pulp), a note that only a portion of the pulp was removed with the remainder left vital, the medicament placed, and the stated goal of continued root development. Chart the follow-up plan too: apexogenesis is monitored over months with periodic radiographs, and those later films are what prove the treatment worked if the claim is ever audited.

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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.