D6740 is the CDT code for an all porcelain/ceramic retainer crown — the anchoring crown placed on an abutment tooth as part of a fixed bridge. It reports a single retainer crown that is part of a bridge, not a standalone crown.
Informational only — confirm the official CDT descriptor and your payers' rules independently. This is general guidance, not billing, coding, or clinical advice.
When to Use the D6740 Code
Report D6740 when an all-ceramic/porcelain crown serves as a retainer — the abutment-supporting unit — within a fixed bridge. The retainer crown is cemented or bonded onto a prepared abutment tooth and connects to the pontic that replaces the missing tooth. It applies to anterior or posterior teeth, as long as the crown is part of a bridge.
Pick the code by standalone versus bridge unit. D6740 is a retainer crown in a fixed partial denture; the nearly identical-looking D2740 is a single, standalone all-ceramic crown not part of a bridge. The distinction is whether the crown anchors a bridge or stands alone. Each bridge unit is coded separately, so each retainer crown (D6740) and the pontic (such as D6245) are their own line items.
Documentation & Clinical Scenarios
Bridges are major, frequently reviewed benefits, so documentation should establish the bridge and the retainer's role:
- Tooth numbers for the abutment tooth (retainer crown) and the pontic, plus the full bridge span.
- A narrative noting the crown material (all porcelain/ceramic) and that it is a bridge retainer, not a standalone crown.
- Pre-operative radiograph(s) showing the abutment teeth and edentulous space.
- Dates — preparation and seat dates, since many payers tie the benefit to the seat date.
The pontic and any second retainer crown are billed under their own codes. Document that the abutment tooth is restorable and suitable to support a bridge, and keep the supporting evidence in the chart even when no pre-authorization is required, in case of post-payment review.
Insurance & Billing Tips
- Distinguish D6740 from D2740 on the claim. Coding a bridge retainer as a standalone crown (or vice versa) can trigger denials or incorrect benefits.
- Verify bridge benefits and missing-tooth clauses. Coverage may hinge on whether the tooth was missing before the plan's effective date.
- Expect possible alternate benefits. Some plans reimburse an all-ceramic retainer at the rate of a metal-based alternative.
- Code each unit. Each retainer crown and the pontic are separate line items on the bridge claim.
- Check frequency and waiting periods. Bridges often carry replacement frequency limits and may have waiting periods on new plans.
Example Case
A 48-year-old patient is missing an upper lateral incisor and elects an esthetic fixed bridge. The dentist prepares the two adjacent teeth as abutments and plans all-ceramic retainer crowns connected to a ceramic pontic. The office submits a pre-estimate with a radiograph; the plan confirms coverage with the tooth documented as missing after the effective date. The bridge is seated, and the claim is filed with D6740 for each retainer crown and a pontic code (D6245) for the false tooth, using the seat date. Because each unit was coded correctly as bridge components rather than standalone crowns, the claim is paid at the expected level.
Patients call about "getting a bridge" for a missing tooth, not D6740. DentalReception AI answers and books those calls 24/7, captures insurance details, and routes clinical and billing questions to your team. See how it handles crown calls, or book a demo.
Frequently Asked Questions
What's the difference between D6740 and D2740?
Whether the crown is part of a bridge. D6740 is an all-ceramic crown serving as a retainer in a fixed bridge — it anchors the bridge to an abutment tooth. D2740 is a single, standalone all-ceramic crown not connected to a bridge. They use the same material and look alike, but the coding differs by function. Use D6740 when the crown supports a bridge and D2740 when it restores one independent tooth.
Does D6740 cover the whole bridge?
No. D6740 is one retainer crown — a single anchoring unit. The pontic (the replacement tooth, such as D6245) and any second retainer crown are billed separately under their own codes. A three-unit bridge typically appears on the claim as two retainer crowns plus one pontic, each documented and coded individually rather than as a single bridge charge.
Will insurance cover a D6740 retainer crown?
Usually under major services, with conditions. Many plans cover bridge components subject to a missing-tooth clause, frequency limits, and waiting periods, and some apply an alternate benefit that reimburses an all-ceramic retainer at a metal-based rate. Coverage often hinges on whether the tooth was missing before the plan's effective date. Verify bridge benefits before treatment so the patient estimate is accurate.
Do I need a pre-authorization for a D6740 bridge?
Many plans recommend or require a pre-estimate for bridges, submitted with radiographs showing the abutment teeth and the edentulous space, plus a narrative noting that the crown is a retainer in a fixed bridge. Because bridges are major benefits subject to missing-tooth clauses and frequency limits, getting the pre-estimate back before the prep appointment lets you quote the patient an accurate out-of-pocket amount.
Confirm the current CDT descriptor and your specific payer policies before billing — browse the full dental code library or see our insurance verification feature.