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Mission Statement

The mission of the Attachments WG is to provide HL7 artifacts that support the exchange of additional supporting information amongst payers/utilization management organizations (UMO’s) and providers related to:

- healthcare claims or encounters - healthcare services review (e.g., prior authorizations/precertifications, referrals) - post adjudicated claim audits


The Attachment Work Group supports HL7’s mission to create and promote its standards. The Attachments Work Group will develop specifications using the principles and language of the Services Aware Interoperability Framework (SAIF) Canonical Definition (CD). The Attachments Work Group standardizes supplemental information needed to support health care insurance. Our purpose is to encourage the use of HL7 for uniform implementation of this supplemental information.

Work Products and Contributions to HL7 Processes The Attachments implementation guide is based on CDA Release 2.0 Consolidated CDA Templates built upon HL7 version 3 messaging. This guide includes Document types such as, but not limited to, Continuity of Care; History and Physical; Operative Report; Progress Notes; Diagnostic and Imaging Reports; Discharge Summary; Consultation Notes; Procedure Notes; Care Plan; Periodontal and Unstructured Documents.

The Attachments Work Group is active in contributing to the development of the FHIR standard and participates actively in HL7 joint work group efforts.

Formal Relationships With Other HL7 Groups

The Attachments Work Group coordinates its work products with other work groups such as, but not limited to; Structured Documents Work Group and FHIR Management.

Formal Relationship With Groups Outside of HL7

The HL7 Attachments Work Group works jointly with the insurance subcommittee of Accredited Standards Committee X12 (ASC X12), American Dental Association Standards Committee on Dental Informatics (ADA SCDI), National Council for Prescription Drug Programs (NCPDP), and other standards development organizations as guided by the Board of HL7. The work group also collaborates with Workgroup for Electronic Data Interchange (WEDI) and the Regenstrief Institute in conjunction with the LOINC® (Logical Observation Identifiers Names and Codes) Committee.

Active Projects

Periodontal Attachment Implementation Guide

AWG Documents

AWG Projects