There is no single list of Delta Dental attachment requirements, and that is the first thing to understand before you spend an afternoon looking for one. Delta Dental is a federation of independent member companies, each of which writes its own processing policies, so documentation that clears a crown in one state can come back as incomplete in another. What stays consistent is the shape of the rule: radiographs for restorative and surgical work, periodontal charting for periodontal therapy, prior placement dates for replacements, and a narrative only where an image cannot show the reason.
That shape is more useful than a list, because it tells you what to gather at the appointment rather than what to hunt for after a denial.
What attachments are needed for dental claims?
Most claims need nothing attached. A prophylaxis, an exam, bitewings, a simple anterior restoration: these adjudicate on the code and the date. Documentation is requested where the plan is asked to pay for something a code alone does not justify.
| Procedure group | Common CDT codes | Documentation usually requested |
|---|---|---|
| Posterior composites | D2391, D2392, D2393, D2394 | Pre-op bitewing or periapical showing the lesion or failed restoration |
| Crowns and onlays | D2740, D2750, D2751, D2752 | Pre-op periapical, plus narrative or photo when the image cannot show a fracture |
| Core buildups and posts | D2950, D2954 | Pre-op periapical and a statement of remaining tooth structure |
| Endodontics | D3310, D3320, D3330 | Pre-op periapical and the final fill image |
| Scaling and root planing | D4341, D4342 | Dated six point pocket charting, plus radiographs showing bone levels |
| Periodontal surgery | D4210, D4240, D4260, D4261 | Charting, radiographs, narrative, often a prior authorization |
| Extractions | D7140, D7210, D7220, D7230, D7240 | Radiograph showing the tooth and the reason for removal |
| Implants and implant restorations | D6010, D6057, D6058, D6104 | Radiographs, narrative, plan history for the missing tooth |
| Prosthetics, removable and fixed | D5110, D5120, D5213, D5214, D6240, D6245 | Prior placement date, extraction dates, radiographs, narrative |
| Orthodontics | D8070, D8080, D8090, D8680 | Banding date, total case fee, months of active treatment |
| Occlusal guards | D9944, D9945, D9946 | Narrative giving the diagnosis, since guards are often excluded |
One line deserves singling out. The buildup, D2950, is asked to prove itself more than anything else in general practice, because it is billed on the crown's date and plans want to know it was a buildup rather than a base under a preparation. A pre-operative periapical plus one sentence on how many walls were missing answers it.
Where the rules for your patient's plan are published
Each member company publishes a dentist handbook and a processing policy manual on its provider site, and those, not the national brand site, are the authority for the plan you are billing. As of this writing, several also publish a prior authorization chart, which answers a different question: prior authorization is permission before treatment, an attachment is evidence with the claim.
Three points follow:
- Bill the company that holds the plan, not the one in your state. The payer ID on the member card routes the claim, and an employer headquartered elsewhere means a plan administered elsewhere.
- Keep the handbook you actually read. Save the PDF with its download date. When a claim denies for documentation you believe you sent correctly, that dated policy is the argument.
- Check the code, not the category. D4341 and D4342 are the same procedure at different extents and can carry different expectations.
How the attachment reaches the claim
An image in your chart is not an attachment. It becomes one when it is linked to the claim in a way the payer's system can follow. Three routes do that, and each fails differently.
| Route | How the claim references it | Where it commonly fails |
|---|---|---|
| Attachment service | Attachment control number on the claim, carried in the 837D PWK segment | Number typed on the claim but the upload never completed, or the reverse |
| Payer provider portal | Uploaded against the claim after submission | Uploaded to the wrong claim, or after the claim finalized |
| Mail or fax | Paper claim with copies, or a cover sheet citing the claim number | Arrives separated from the claim and is never matched |
That PWK segment carries a report type code and an attachment control number. Common report type codes include RB for radiology films, P6 for periodontal charts and OZ for support data for claim, plus a transmission code saying whether the attachment comes electronically, by mail, by fax, or on request. Your clearinghouse companion guide confirms the values that connection accepts.
The mismatch is the failure mode to guard against. A claim announcing an attachment that never arrived denies for missing documentation, and an attachment uploaded without the control number sits unmatched. If denials cluster on claims where staff are certain the images went out, check that first and treat it as a process problem, as in our guide to fixing dental claim authorization bottlenecks.
What makes an attachment fail review
Reviewers decide in seconds from a small image on a screen. The avoidable rejections are mechanical.
- Wrong image for the question. A bitewing does not show a periapical radiolucency, and a panoramic image rarely justifies a single crown.
- No orientation or identification. Images should carry the patient name, the date taken and clear left and right orientation.
- Too old. Pre-operative images should reflect the condition at the time of treatment. A radiograph from three years ago does not document today's fracture.
- Everything, sent hopefully. A full mouth series on every claim slows review and does not help. Send the image that answers the question.
- A narrative describing the procedure rather than the reason. A reviewer knows what a crown is. The narrative supplies the finding: the cusp that fractured, the recurrent decay under the existing restoration, the remaining tooth structure. If narratives read as justification for a higher code, overcoming a dental claim denial for upcoding covers how to reframe them.
Documentation cannot fix a benefit problem. If the plan applies an alternate benefit, pays a porcelain crown at the base metal rate, or excludes a service outright, a perfect radiograph changes nothing. Our explanation of what an alternate benefit provision means separates a claim needing evidence from one needing a conversation with the patient.
Why are dentists getting rid of Delta Dental?
Practices that reduce participation cite the contracted fee schedule against their costs, changes to that schedule at renewal, and staff time spent on documentation and appeals. Practices that stay cite patient volume. Since each member company negotiates its own schedules and tiers, a colleague's experience in another state does not transfer. The decision is arithmetic you can do yourself:
- What percentage of collections comes from that network, by location.
- The write off percentage on that book, your usual fee minus the contracted allowable, not billed minus paid.
- Administrative hours absorbed per claim, including attachments and appeals.
- How many of those patients would realistically stay if you went out of network.
If the answer is close, the cheaper first move is fixing the documentation workflow, not the contract, because denial rework is the cost you control.
Will Delta Dental pay for a retainer?
Two different things get called a retainer, and mixing them up produces a bad estimate.
An orthodontic retainer, D8680, is coverable only where the plan carries an orthodontic benefit. Many plans treat retention as part of the global case fee for comprehensive treatment, D8070, D8080 or D8090, and pay nothing separately for D8680. Where a plan does pay it separately, an age limit and a lifetime orthodontic maximum usually apply, and replacing a lost retainer is commonly excluded. The documentation needed is the banding date, total case fee and months of active treatment.
An occlusal guard, D9944 through D9946, is what a patient often calls a retainer when they mean a nightguard. That is a separate benefit category, frequently excluded, and where covered a narrative giving the diagnosis is expected. Verify both before quoting.
How to get around the missing tooth clause?
You do not get around it. You find out about it before treatment planning and build the case that it does not apply.
A missing tooth provision excludes replacement of a tooth already missing when coverage started. The workable moves: confirm during verification whether the plan carries the provision at all, since many do not; document the extraction date, and if the tooth came out while this plan or a prior plan was in force, submit that evidence with the claim; check whether the plan instead uses a prior placement time limit, commonly quoted at five to seven years between replacements, which is a different rule with a different answer; and check for secondary coverage.
What must not be attempted is adjusting an extraction date or a tooth number. That is fraud, with consequences reaching your state dental board and your license. Where the claim denies anyway, why a dental implant claim was denied works through the appeal path, and how long you have to appeal covers the deadlines, which vary by plan and state and should be confirmed with your state insurance department.
Build the sheet once, use it every day
Practices that rarely see a documentation denial are not more diligent at submission. They decided once, per payer and per code, what gets attached, then made that decision impossible to skip. Curo carries those per payer rules alongside the claim and holds one about to go out without what the rule asks for, which you can check against your own denial pattern through claims automation.
Building the sheet by hand works too. Take your last hundred denials, pull the ones citing missing or insufficient documentation, and sort by code. Four or five codes will account for most, and buildups, scaling and root planing, and crowns usually lead. Write the rule for those first, keep it where claims are submitted, and revisit when a member company reissues its handbook.