Dental claim attachments: what payers require and how to send them

What counts as a dental claim attachment

An attachment is any document that goes with a claim, or follows it, to back up the procedures billed. The lists payers publish include X-rays, periodontal charts, narratives, chart notes, photos, lab slips, pathology and operative reports, anesthesia records, and the primary payer's explanation of benefits ^{[4] [6] [7]}.

• X-rays. The image type matters. Delta Dental wants a periapical (PA) for crowns, buildups, root canals, implant restorations and bridge abutments, and will not take a panoramic image (pano) in its place ^[4].
• Periodontal charts. Aetna wants a dated chart of the whole mouth that records six depths in millimeters on each tooth, plus furcation class and mobility grade ^[6].
• Narratives. Aetna wants the narrative to name the clinical condition behind the treatment ^[6]. Humana also wants to know why the work was done ^[7].
• Photos. Delta Dental wants photos alongside X-rays for cracked teeth, buildups, crowns and front tooth fillings when the image alone does not show the need ^[4]. Blue Cross Blue Shield of Michigan says photos and models cannot stand in for X-rays ^[8].
• Other papers. A secondary plan often wants to see the primary payer's EOB ^[13], and Aetna and Humana ask for anesthesia records on general anesthesia and deep sedation codes ^{[6] [7]}.

Which procedures usually need which attachment

Payers do not want attachments on every claim. Delta Dental says only the codes in its documentation table always need support, and asks offices to hold back documents on other codes until it requests them ^[4]. Aetna says a routine cleaning or small filling needs only a complete claim unless it asks for more ^[6]. Check the current document for the specific plan before you rely on any example here.

For scaling and root planing, UnitedHealthcare takes a full series or a pano ^[9], the ADA points offices to bitewings, or at times a full mouth series, and away from a pano ^[14], and Humana rules out panos for several gum disease codes ^[7]. Cigna wants the chart within six months ^[10], while Humana and Delta Dental allow up to a year ^{[7] [4]}.

How attachments travel to the payer

There are three routes: an electronic attachment network that the electronic claim points to, the payer's own portal, and the mail ^{[3] [8] [4]}.

On an electronic claim, the X12 837 Dental transaction, the image does not ride inside the claim ^[3]. A PWK segment tells the payer that supporting documents exist and how to find them, using a report type code, a transmission code and an attachment control number ^[3]. When the document goes through an electronic attachment network, the control number is the reference number the network gives you ^[3].

That control number is where linking breaks. Cigna's companion guide says attachment reference numbers typed into the claim's free text note belong in the PWK segment instead ^[3].

Commenters on the federal rule told HHS that each payer runs its own portal and that juggling many logins is a real burden ^[1]. By mail, Delta Dental accepts good copies, not your only originals, and returns nothing without a stamped envelope ^[4]. Humana says not to send photocopied X-rays ^[7], and Blue Cross Blue Shield of Michigan destroys films once it has scanned them ^[8].

The federal attachment rule, CMS-0053-F

HIPAA called for a national claims attachment standard in 1996 ^[1]. On March 24, 2026, HHS published the final rule, known as CMS-0053-F, at 91 FR 14350 ^[1].

• Effective date: May 26, 2026 ^{[1] [2]}.
• Compliance date: May 26, 2028 ^{[1] [2]}.
• Scope: claims attachments only. HHS left a prior authorization attachment standard out of the final rule ^{[1] [2]}.
• Standards: the X12N 275 transaction, version 006020, for sending added information, and the X12N 277, version 006020, for a payer asking for it, plus HL7 attachment guides and an electronic signature standard ^{[2] [1]}.

Citing the 2024 CAQH Index, HHS reports that 37 percent of dental attachment transactions that year were fully electronic ^[1].

Why attachments get rejected or ignored

• Wrong image type, such as a pano where Delta Dental needs a PA ^[4].
• The root tip is cut off. Delta Dental and Aetna want it in view ^{[5] [6]}.
• The image is unclear or marked up. Aetna will not take X-rays with drawings or colored overlays ^[6].
• The image is too old. Aetna wants images under 36 months old ^[6], and Delta Dental wants crown images within a year of the prep ^[4].
• Tooth numbers or dates are missing. Delta Dental flags codes that do not match the count of qualifying teeth ^[5], and Aetna and Humana want X-rays dated ^{[6] [7]}.
• The attachment is not linked. Without the right attachment control number in the PWK segment, the payer may hold the document but cannot match it to the claim ^[3].

Office checklist for claim attachments

1. Look up the payer's current attachment list for each code on the claim ^{[4] [6] [7] [9]}.
2. Confirm how this payer takes attachments: which electronic attachment network, its portal, or mail ^{[3] [7] [8]}.
3. Check the image type against the code: PA, bitewing, full mouth series or pano ^{[4] [7] [14]}.
4. Make sure the root tip shows and the image is dated, free of drawings and inside the payer's age limit ^{[4] [5] [6] [7]}.
5. For gum disease claims, confirm the chart has six readings per tooth, is dated and falls inside the payer's window ^{[6] [7] [10]}.
6. Make sure the narrative names the clinical condition and the reason for the procedure ^{[6] [7]}.
7. Check that tooth numbers, surfaces and quadrants on the claim match the attachments ^[5].
8. On an electronic claim, confirm the attachment reference number sits in the PWK segment, not only in a note ^[3].

How Marathon handles attachments

Marathon matches X-rays and periodontal charts to each procedure on a claim and drafts a narrative where one is needed. Your team reviews the attachments and the narrative, then sends the claim. See how it connects to OpenDental and Dentrix.