> ## Documentation Index
> Fetch the complete documentation index at: https://dso.getlemma.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Dental attachments

> How claim attachments work in dentistry: the NEA FastAttach workflow and NEA numbers, DentalXChange's integrated service, payer request-for-information cycles, and the 2026 HIPAA attachments rule (X12 275, compliance May 2028).

An **attachment** is clinical documentation sent to a payer in support of a claim or predetermination. Common examples include radiographs, periodontal charts, narratives, and intraoral photographs. Much of the current dental workflow relies on proprietary reference numbers because HIPAA did not specify a claims-attachment transaction for decades. Under the standard finalized in 2026, covered entities must support the X12 **275** transaction by **May 26, 2028**.

## Why dental claims need attachments

Dental payers use both the submitted code and supporting evidence to adjudicate major work. The following procedure families commonly require documentation:<sup>1</sup>

| Procedure family                    | What payers typically want                                                                                                       |
| ----------------------------------- | -------------------------------------------------------------------------------------------------------------------------------- |
| **Crowns and fixed prosthodontics** | Pre-operative radiographs; a narrative on why the tooth needs full coverage; replacement-interval history for replacement crowns |
| **Scaling and root planing (SRP)**  | Periodontal charting (pocket depths) and radiographs showing bone loss                                                           |
| **Implants**                        | Radiographs, narrative, and often the missing-tooth history                                                                      |
| **Extractions and oral surgery**    | Radiographs                                                                                                                      |
| **Orthodontics**                    | Records supporting the case; requirements vary widely by plan                                                                    |

Each payer publishes its own documentation policy by procedure. Maintain a payer-specific list of the CDT codes that require attachments and submit the documentation with the claim when the policy calls for it. Otherwise, the claim may pend while the response deadline continues to run.

## The NEA FastAttach workflow

For decades HIPAA had no adopted attachment standard, so the industry used shared repositories and reference numbers carried on claims. A widely used service is **NEA FastAttach**, now owned by **Vyne Dental**:<sup>2</sup>

1. The practice uploads the documentation (radiographs, charting, narrative) to NEA's repository.
2. NEA returns a unique **NEA number** for the attachment set.
3. The biller places the NEA number in the claim's remarks (or the field the payer's companion guide designates).
4. The payer retrieves the attachment from the repository during adjudication.

Common failures include uploading documentation without placing the NEA number on the claim and using a repository that the member's plan does not retrieve from. Not every payer participates with every attachment vendor, so check the vendor's current payer list.

## DentalXChange's integrated service

**DentalXChange** (legally EDI Health Group, Inc.) offers an attachment service within its ClaimConnect clearinghouse platform. Attachments can follow the same workflow as the 837D submission without separate repository software.<sup>3</sup> A group comparing clearinghouses should ask whether claims, attachments, and real-time eligibility share one connection or require separate products. See [The clearinghouses, compared](/reference/vendors/clearinghouse-comparison).

## The request-for-information cycle

When a payer needs more documentation, it may pend the claim and request information:

1. The payer suspends adjudication and issues a request, currently by letter, portal message, or a remittance carrying an information-request code. Examples include CARC 252, "an attachment/other documentation is required," or CARC 16 with a RARC naming the missing element. See [CARC codes](/reference/edi/carc-codes).
2. The practice has a response window; miss it and the claim denies for failure to provide requested information.
3. The response goes back through the payer's designated channel; attachment vendor, portal upload, or mail.

Each request can delay payment. Attach documentation at submission when the payer's policy requires it, and route new information requests promptly. A predetermination for major work can also identify documentation requirements before treatment. See [Get predeterminations](/guides/billing/get-predeterminations).

Beginning with the 2028 compliance date, this cycle uses standard transactions: the payer sends an electronic **277 RFAI** (Request for Additional Information), and the provider responds with a **275**.

## The 2026 final rule

On **March 24, 2026**, CMS published the HIPAA claims-attachment standard it first proposed in December 2022:<sup>4</sup>

| Element                     | Detail                                                                                                                                                                 |
| --------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Rule**                    | Administrative Simplification: Adoption of Standards for Health Care Claims Attachments Transactions and Electronic Signatures, **91 Fed. Reg. 14350** (Mar. 24, 2026) |
| **Effective date**          | May 26, 2026                                                                                                                                                           |
| **Compliance date**         | **May 26, 2028**                                                                                                                                                       |
| **Attachment transmission** | **X12N 275** (version 006020X314), Additional Information to Support a Health Care Claim or Encounter                                                                  |
| **Payer requests**          | **X12N 277 RFAI** (version 006020X313), Request for Additional Information                                                                                             |
| **Attachment content**      | HL7 C-CDA R2.1 templates and the HL7 CDA attachment implementation guide                                                                                               |
| **Signatures**              | An HL7 digital-signature standard for electronic signatures on attachments                                                                                             |
| **What was dropped**        | The 2022 proposal (87 Fed. Reg. 78438) also covered **prior-authorization attachments**; the final rule finalizes **claims attachments only**                          |
| **Who it binds**            | Covered entities; health plans, clearinghouses, and providers transmitting the covered transactions electronically; the rule does not carve dental in or out by name   |

What it means in practice:

* **Claims-attachment workflows must change.** Covered entities must support payer requests through the 277 RFAI and responses through the 275 by May 26, 2028. Existing attachment vendors may preserve a similar upload experience while changing the underlying transaction.
* **Ask vendors for a written implementation plan.** If a PMS, clearinghouse, or attachment-vendor contract extends beyond the compliance date, confirm testing dates, fees, contract changes, and support for a transition period. See [Choose a clearinghouse](/guides/billing/choose-a-clearinghouse).
* **Predetermination and preauthorization attachments are not covered.** Those remain subject to payer-specific channels because the final rule did not adopt the proposed prior-authorization attachment standard.

## Sources

1. Payer documentation demands for crowns, SRP, and implants per attachment-vendor and payer guidance: Vyne Dental, [FastAttach](https://vynedental.com/fastattach/); GEHA, [NEA FastAttach payer instructions](https://www.geha.com/en/resource-center/provider-resources/nea-fastattach). Requirements are payer- and plan-specific; consult each payer's documentation policy.
2. Vyne Dental, [FastAttach](https://vynedental.com/fastattach/); [FastAttach user manual (PDF)](https://vynedental.com/wp-content/uploads/2020/10/Dental_FastAttach_User_Manual-2019-07-22.pdf); Open Dental, [claim attachments documentation](https://www.opendental.com/manual/claimtabattach.html).
3. DentalXChange, [ClaimConnect attachment service](https://payconnect.dentalxchange.com/provider/claimconnect/AttachmentPage); [ClaimConnect services](https://payconnect.dentalxchange.com/provider/claimconnect/ClaimServices).
4. Administrative Simplification: Adoption of Standards for Health Care Claims Attachments Transactions and Electronic Signatures, 91 Fed. Reg. 14350 (Mar. 24, 2026). [Federal Register](https://www.federalregister.gov/documents/2026/03/24/2026-05676/administrative-simplification-adoption-of-standards-for-health-care-claims-attachments-transactions); [full text (GovInfo)](https://www.govinfo.gov/content/pkg/FR-2026-03-24/html/2026-05676.htm); proposed rule: 87 Fed. Reg. 78438 (Dec. 21, 2022), [Federal Register](https://www.federalregister.gov/documents/2022/12/21/2022-27437/administrative-simplification-adoption-of-standards-for-health-care-attachments-transactions-and).