D3347 — Retreatment of previous root canal therapy — premolar
Retreatment is a second root canal on a tooth that has already had one. D3347 is the version for a premolar.
This code belongs to a set of three covering endodontic retreatment. The clinical detail lives in the endodontic retreatment guide; the code-level detail is here.
Everything below is specific to this code: what it pins down, what it is worth, how a payer handles it, and which codes it is not.
What has to be true for D3347 to apply
Tooth — a premolar, narrower than a molar and often with a single root, sitting just inside the visible part of the smile.
D3347 against the codes beside it
D3346 — Retreatment of previous root canal therapy — anterior: It applies to front tooths rather than premolars.
D3348 — Retreatment of previous root canal therapy — molar: It applies to molars rather than premolars.
Those two codes and D3347 are the whole group — nothing else describes this procedure. The safest question to ask is not "what does this cost" but "which code is going on the claim". The first answer changes; the second decides the first.
Every code in this group
These codes describe the same broad procedure and differ in one respect each. Each has its own page with its own fee range and coverage notes.
| Code | Procedure |
|---|---|
| D3347 | Retreatment of previous root canal therapy — premolar — this page |
| D3346 | Retreatment of previous root canal therapy — anterior |
| D3348 | Retreatment of previous root canal therapy — molar |
Questions about D3347
D3347 — what is it?
It is the entry for retreatment of previous root canal therapy, premolar. A practice cannot use it for anything broader than that, which is what makes the code useful to you.
Is D3347 expensive?
Typically $1,000–$1,900 before insurance, depending on local fees and the complexity of the individual case.
Does dental insurance cover D3347?
Usually yes, as basic / major treatment at typically 50–80% — but coverage turns on your own policy, its annual maximum and any waiting period.
What is the difference between D3347 and D3346?
D3346 is retreatment of previous root canal therapy, anterior: it applies to front tooths rather than premolars. The rest of the procedure is the same, which is why the two get substituted for one another on estimates.
Also known as: root canal retreatment, failed root canal, redo root canal, endodontic revision.