D6740 Dental Code: Porcelain Retainer Crown (vs D2740)

What D6740 reports

D6740 reports a porcelain or ceramic crown that serves as a retainer in a fixed partial denture. In plain terms: it is the anchor crown of a bridge. The crown caps a prepared natural tooth at one end of the span and connects to the pontic, the replacement tooth that fills the gap. The code covers the crown unit itself, fabricated in porcelain or ceramic and acting as part of the bridge assembly.

The defining feature is the role in the case, not the appearance of the crown. A retainer crown looks like any other porcelain crown. What makes it a D6740 is that it is splinted to a pontic and carrying a bridge, rather than restoring a single tooth on its own.

A classic three-unit bridge has three units, billed as three lines: a retainer crown on each end and a pontic in the middle. If both ends are all-ceramic retainers, that is two D6740s plus one D6245 porcelain pontic.

D6740 vs D2740: the distinction that drives the code

This is where the code gets miscoded, and it is the reason most people land on this page. D2740 and D6740 describe crowns made of the same material, prepared and seated the same way, that can be indistinguishable in the mouth. The split is functional.

D2740 is a single porcelain/ceramic crown that stands alone on a natural tooth. It restores one tooth and connects to nothing.

D6740 is a porcelain/ceramic crown that anchors a bridge. It is joined to a pontic and shares the load of replacing a missing tooth.

The test is simple: is there a pontic in the case? If the crown is splinted to a pontic, it is a retainer, and the retainer code applies. If the crown is by itself, it is a single crown.

Billing a bridge: retainers and pontic together

A fixed bridge is never one code. Each unit is its own line, each with its own tooth number:

• Retainer crowns on the anchor (abutment) teeth. For all-ceramic, that is D6740 on each.
• A pontic for each replaced tooth in the span. For all-ceramic, that is D6245.

Match the material across the whole bridge so the units read as one prosthesis. Porcelain/ceramic retainers (D6740) go with a porcelain/ceramic pontic (D6245). If the bridge is porcelain fused to high noble metal instead, the retainers are D6750 and the pontic is D6240. Mixing an all-ceramic retainer with a PFM pontic on the same span is a red flag that something was coded by habit rather than by what was made.

D6740 vs the implant retainer codes

D6740 is for a tooth-supported bridge. The retainer crown caps a prepared natural tooth. The moment the anchor is an implant rather than a tooth, you are in a different family and D6740 no longer applies.

For a single implant restoration, the codes are D6058 (abutment-supported porcelain/ceramic crown) or D6065 (implant-supported porcelain/ceramic crown, no separate abutment). For a bridge anchored on implants, the abutment-supported retainer for a porcelain/ceramic fixed partial denture is D6068, the implant-world analog of D6740.

The distinguishing axis here is what the crown sits on, a natural tooth or an implant, not what the crown is made of. Confirm the support before you pick the code. A tooth-supported retainer code on an implant case will deny, and an implant retainer code on a natural-tooth bridge will too.

Coverage reality: the missing-tooth clause decides

Whether D6740 gets paid usually has less to do with the crown and more to do with the tooth it helps replace. Bridge benefits run through the plan’s missing-tooth clause, and that clause is where most bridge claims are won or lost.

Plan-dependent factors that decide the case:

• The missing-tooth clause. Many plans exclude replacement of a tooth that was already missing before the patient’s coverage started. If the pontic position fails that clause, the carrier can deny the pontic, and sometimes the whole bridge, regardless of how cleanly the retainers are coded.
• Frequency and replacement limits. Plans that cover bridges typically limit how often a prosthesis in a given area will be replaced, often once every five to seven years, varying by contract.
• Alternate benefit and downgrade. A plan may alternate-benefit a bridge against a different treatment, or downgrade the material (paying an all-ceramic bridge at a lower-cost material allowance). The patient owes the difference where the contract permits.
• Abutment status. Some plans want documentation that the anchor teeth genuinely need crowns, not just that they border the gap.

Because the retainers and pontic are billed as separate lines, a plan can pay part of a bridge and deny another part. Check the missing-tooth clause before prep, not on the EOB.

Documentation that supports the claim

A retainer crown claim sits inside a bridge claim, so the documentation has to explain the whole prosthesis, not just one crown:

• Tooth numbers for every unit. Each retainer and the pontic carry their own tooth number. The pontic position is what the missing-tooth clause is keyed to.
• The missing tooth and when it was lost. A date of extraction or a note that the tooth was congenitally absent or lost during coverage is what answers the missing-tooth clause. This is the single most important piece of documentation on a bridge.
• A preoperative radiograph. Most carriers want a film showing the edentulous space and the condition of the abutment teeth.
• Why the abutments need crowns. A short narrative tying the anchor teeth’s condition to the need for full-coverage retainers, so the retainer crowns don’t read as elective.
• Material. Note that the retainers and pontic are porcelain/ceramic so the claim and the lab slip agree.

When to bill D6740

Bill D6740 when you seat a porcelain or ceramic crown that serves as a retainer in a tooth-supported bridge, connected to a pontic, on a prepared natural tooth.

Do not bill D6740 for:

• A single porcelain/ceramic crown that stands alone. Use D2740.
• A retainer crown of a different material. Use D6750 for porcelain fused to high noble metal, and the matching code for other materials.
• A crown anchored on an implant. Use the implant retainer family (D6058, D6065, D6068) depending on the case.
• The pontic itself. The replacement tooth is its own code (D6245 for porcelain/ceramic).

What to get right in your PMS

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

1. Build the bridge as separate units in the treatment plan. Each retainer and pontic should be its own line with its own tooth number, not one lumped “bridge” entry. That is how the claim has to go out and how the missing-tooth clause gets applied.
2. Keep D6740 distinct from D2740 in your code table. One fuzzy “porcelain crown” entry is how a retainer gets billed as a single crown. Make the standalone crown and the retainer crown separate, clearly labeled line items.
3. Capture the missing-tooth date at treatment planning. The date the pontic-position tooth was lost is the field that decides the claim. Get it into the record before the claim goes out, not after a denial.
4. Predetermine the whole bridge. Send the retainers and pontic together on the pre-d so the carrier rules on the prosthesis as a unit, including the missing-tooth clause and any material downgrade.
5. Post the EOB unit by unit. A plan can pay the retainers and deny the pontic, or downgrade the material. Reconcile each line against the contract so the patient’s balance reflects what the plan actually allowed.