Dental Crown Codes: D2740, D2950 and Seat Date Billing

Dental crown codes sit in the D2700 range of the CDT Code, and most of them differ only by the material the crown is made from. D2740 is the code offices most often use for an all-ceramic crown, D2950 covers a core buildup placed under a crown when the tooth needs one, and the crown seat dental code question (does the claim carry the prep date or the seat date?) sends back more claims than the codes themselves. This guide looks at each piece from the billing side: what carriers check, where crown claims stall, and how to send one a reviewer can approve the first time.

This article is general information, not coding advice. Choosing a code is the treating dentist’s decision, based on what was done and what the clinical record shows. We describe codes here in our own plain words; for the exact nomenclature and descriptors, use the current CDT manual published by the American Dental Association.

What are the main dental crown codes?

Single crowns on natural teeth are grouped by material. In general terms, the families look like this:

• Resin-based crowns, made indirectly from composite or resin, at the start of the range.
• All-ceramic crowns, where D2740 is the code for a crown made entirely of porcelain or ceramic.
• Porcelain fused to metal crowns, D2750 through D2753, split by the type of metal under the porcelain.
• Three-quarter crowns, a smaller group for partial coverage restorations.
• Full cast metal crowns, D2790 through D2792, again split by metal class, plus a separate code for titanium.

Prefabricated crowns (such as stainless steel crowns) and the interim crown code D2799 sit nearby but follow different rules, and crowns on implants or bridge abutments use their own ranges. Because the metal class decides which porcelain-fused or cast code applies, ask your lab to state the alloy on the lab slip and keep that slip in the chart. A mismatch between the lab slip and the claim is an easy reason for a carrier to question the code.

When does a carrier pay for D2740 or another crown?

A carrier does not pay simply because a crown code exists. It pays when the record shows the tooth needed one. Cigna’s published coverage guidelines for its dental PPO plans are a good example: they allow a crown when the submitted information confirms extensive decay or fracture that a filling cannot restore, and they decline crowns placed only for cosmetic reasons, to change the bite height, or for wear without symptoms. Teeth with a questionable periodontal, endodontic or restorative outlook are also declined.

Other limits show up on the benefits check rather than on the claim itself:

• Replacement frequency. Most plans will not pay for a new crown on the same tooth until a set number of years has passed since the last one was placed.
• Age limits. A 2023 Delta Dental handbook of national processing policies, for example, listed crowns and onlays as not a benefit for children under 12.
• Waiting periods and coinsurance. Crowns are usually classed as major services, which can carry a waiting period and a lower coverage percentage.
• Alternate benefits. Some plans pay a crown at the rate of a less costly option and leave the difference to the patient. The ADA describes paying under a different, lower-cost code than the one reported as downcoding.

Our team gathers these details during Insurance Verification & Eligibility, so the patient estimate reflects the plan before the tooth is prepped.

What documentation should go with a crown claim?

Whatever dental crown codes appear on the claim, a reviewer at the carrier has to be able to see the problem. A typical crown submission includes:

• A recent preoperative periapical or bitewing image that shows the decay, fracture or failing restoration.
• An intraoral photo when a crack or fracture does not show up on an x-ray.
• A short narrative: the tooth number, what the dentist found, and why a filling would not hold.
• For a replacement, the prior placement date and the reason the old crown failed, such as recurrent decay, broken porcelain or open margins.
• Periodontal charting when bone levels could raise a question about the tooth’s outlook.

Keep the narrative factual and tied to the chart. The same Delta Dental handbook states that narratives are not treated as legal documentation and that the dental record is what counts in a review, so the narrative should summarize the clinical notes, not stand in for them.

How should D2950 core buildups be documented?

D2950 is the code for a core buildup, which replaces missing tooth structure so a crown has enough to hold on to. It is a separate procedure from the crown, and it is one of the most frequently denied lines on a crown claim. The ADA’s guidance on D2950 explains that a buildup is meant for teeth that lack enough structure to retain the crown, and that it should not be reported when material only fills undercuts, box forms or small irregularities in the preparation. The ADA also opposes bundling as a way to reduce benefits, and says that a plan which bundles the buildup into the crown should allow the combined fee.

Carrier rules add their own conditions. Cigna’s PPO guidelines, for instance, do not allow a buildup when there is no major decay or fracture, when it is not needed to retain the final restoration, when it is done on the same date and tooth as delivery of the final crown (with possible exceptions for same-day CAD-CAM crowns), or when it goes with an inlay or onlay.

Useful documentation for a buildup:

• A preoperative image showing how much tooth structure is missing.
• A chart note describing what was left after decay and old restorations were removed, ideally with a photo.
• A statement, in the dentist’s own words, that the buildup was needed for retention.
• The correct date. Buildups are usually placed at the prep appointment, so the buildup line normally carries that date while the crown follows the carrier’s completion rule.

Should a crown claim use the prep date or the seat date?

This is the crown seat dental code question every front desk asks, and the plan decides the answer. Many carriers treat a crown as a multistage procedure that is reported once it is finished. The 2023 Delta Dental handbook defined the completion date for crowns, inlays, onlays and fixed bridges as the day the final restoration is cemented, whatever cement is used. Premera Blue Cross Blue Shield of Alaska moved crown, bridge and denture payments from the prep date to the seat date in January 2022, describing the change as matching standard industry practice.

Plans and contracts can differ, so confirm before you bill:

• Which date the plan wants on the claim, and whether it treats a same-day milled crown differently from a lab crown.
• Whether the patient’s coverage is still active on the seat date. If coverage ends between prep and seat, a plan that pays on the seat date can deny the claim or take back a payment.
• Whether the benefit year turns over between the two visits, which changes which year’s maximum and deductible apply.

Billing on the prep date when the plan requires the seat date can lead to recoupments or contract trouble, and the reverse can delay payment. Our Dental Claims Management team checks each carrier’s rule before a crown claim leaves the practice software.

Why do crown claims get denied?

1. Missing or weak images. The x-ray is missing, too old, or does not show the problem.
2. Replacement inside the frequency window. The plan’s history shows a crown on that tooth within its replacement period.
3. Buildup not supported. The record does not show that retention required it, or it was billed on the seat date.
4. Material code mismatch. The claim names one material class and the lab slip another.
5. Alternate benefit applied. The plan paid at the rate of a less costly restoration.
6. Wrong date of service. The claim carries the prep date for a plan that pays on completion.
7. Interim crown billed as a routine temporary. Cigna’s guidelines, for example, limit D2799 to interim crowns left in place for an extended period, generally six months or more, while routine temporaries are part of the crown fee.

When a denial arrives, read the remark code on the EOB first, then decide whether the fix is a corrected claim, a missing attachment or a written appeal. Our Denial Management & Appeals team works these cases, and our guide on how to appeal a denied dental claim explains the steps.

How does our dental RCM team check crown claims?

We work inside your own Open Dental, Dentrix or Eaglesoft database, so the checks happen where the claim is built. The same steps apply across all dental crown codes, whatever the material:

• At treatment planning, we confirm the replacement history, prior placement date, waiting period, alternate benefit language and the plan’s date-of-service rule.
• When the plan or the patient wants one, we send a pre-treatment estimate with the images and narrative already attached.
• We hold crown claims until the date the carrier requires and compare the material code against the lab slip.
• We attach the x-rays, photos and narrative, then track the claim until it is paid or answered.

Practices with heavy restorative schedules, such as prosthodontics and general dentistry offices, see the most crown claims, so these checks tend to matter most there. For a wider view of the code set, see our dental billing codes guide.

Want crown claims that arrive complete?

If crowns and buildups keep coming back with requests for more information, book a free consultation. We will look at how your office documents and dates crown claims and point out the gaps carriers are likely to question.