Crown codes: choosing between D2740, D2750, D2790 and D6740
Two things decide a crown code: what it is made of, and what it sits on. Get the second one wrong and the claim is not underpaid, it is describing a different procedure.
Crowns are high-volume and high-value, which makes small systematic coding errors expensive in a way single denials are not. Three decisions cover almost all of it: the restoration's material, whether it sits on a natural tooth or part of a bridge, and whether the payer will honour the material you actually used.
D2740 and D6740 are not the same restoration
This is the error worth checking for first, because it is systematic rather than occasional — practices tend to get it consistently right or consistently wrong.
The D2000 series covers restorations on natural teeth. The D6000 series covers prosthodontics: the retainer crowns that anchor a fixed bridge, and restorations on implants. A ceramic crown on a natural molar is D2740. A ceramic crown serving as the abutment retainer of a three-unit bridge is D6740, and it is billed alongside the pontic rather than on its own.
- A single D6740 with no pontic on the claim is internally inconsistent — a bridge retainer with nothing to retain.
- Billing D2740 for a bridge retainer understates the case and frequently causes the bridge to be processed as separate single units, which can be denied as a mismatch against the prosthodontic frequency rules.
- A crown on an implant is neither of these. It is D6058 or D6065, decided by whether a separate abutment exists. The implant codes page covers that choice.
The material codes, and the downgrade that follows them
Within the natural-tooth series the split is by material: all-ceramic, porcelain fused to metal, and full cast metal, with the metal-bearing codes subdividing again by noble metal content.
The subdivision matters because it drives reimbursement, and because the alternate benefit clause is the single biggest source of underpayment in crown billing. Many plans will pay a posterior crown at the base metal rate regardless of what was delivered, leaving the difference with the patient.
- Where the downgrade is contractual, no narrative changes it. What changes the outcome is telling the patient before treatment, so the balance is expected rather than disputed.
- Where it is discretionary, a specific clinical reason can hold the higher material: aesthetic zone, documented metal sensitivity, parafunctional load.
- Report the metal content accurately. Billing a high noble code for a base metal restoration is not an aggressive position, it is a false claim.
Date of service: prep or seat
Most payers want the seat date, treating the procedure as complete on insertion. A minority accept the preparation date. The distinction decides which benefit year a crown falls into, and with annual maximums it decides whether the patient has coverage at all.
- Confirm the carrier's rule at verification rather than assuming it, particularly for cases prepped in December and seated in January.
- Where a patient loses coverage between prep and seat, the rule the carrier uses determines whether anything is payable. This is worth knowing before the prep, not after.
What justifies the crown in the first place
A crown on a tooth that could have held a filling is the denial that documentation actually prevents, and it is worth more attention than the material codes get.
- A pre-operative radiograph showing the extent of the existing restoration or the caries.
- A photograph where the issue is a fracture or cuspal involvement a radiograph will not show.
- A note on how much tooth structure remains, in terms a reviewer can picture: which cusps are missing, what proportion of the tooth is existing restoration.
- The reason a direct restoration was not appropriate, written specifically rather than as a template line.
- The seat date of any previous crown on that tooth, which answers the replacement frequency limit before it is asked.
The codes that travel with a crown
Several adjacent procedures are billed separately and are regularly either bundled by the payer or forgotten by the practice.
- Core build-ups are a frequent bundling target. They are payable where the build-up genuinely replaces missing tooth structure, and routinely denied where they are described as filling undercuts for the preparation. The build-up and post codes page covers the distinction.
- Recementing an existing crown is its own code and is not part of a new crown.
- A laboratory-fabricated provisional is separate from a chairside temporary, which is included in the crown fee. Billing a chairside temporary separately is an unbundling flag.
Questions
What is the dental code for a crown?
It depends on the material and on what the crown sits on. For an all-ceramic crown on a natural tooth it is D2740; porcelain fused to metal and full cast metal have their own codes, subdivided by noble metal content. A crown acting as the retainer on a fixed bridge is in the D6000 series instead — D6740 for the ceramic equivalent — and a crown on an implant is different again.
What is the difference between D2740 and D6740?
What the crown sits on. D2740 is a ceramic crown on a natural tooth, in the restorative series. D6740 is the ceramic retainer crown of a fixed bridge, in the prosthodontic series, and it is billed with the pontic that it anchors. A D6740 appearing on a claim with no pontic contradicts itself, and a bridge retainer billed as D2740 often causes the bridge to be processed as unrelated single units.
Why was our crown paid at a lower rate than we billed?
Almost always an alternate benefit or downgrade clause, which pays posterior crowns at the base metal rate whatever material was delivered. Where that is contractual, no appeal or narrative changes it. The practical answer is to identify it at verification and put the patient's share in the treatment plan they sign, rather than discovering it on the explanation of benefits.
Do you bill a crown on the prep date or the seat date?
Most payers want the seat date and treat the procedure as complete on insertion, though a minority accept the preparation date. It is contractual, so confirm it at verification. It matters most for cases prepped in one benefit year and seated in the next, where the rule decides which annual maximum applies and occasionally whether anything is payable at all.
Why was our core build-up denied with the crown?
Build-ups are a common bundling target. They are generally payable where the build-up replaces genuinely missing tooth structure and generally denied where the documentation suggests it filled undercuts to improve the preparation. The note and the pre-operative radiograph decide it, so describe what was missing rather than what was done.