Highmark Now Accepting 275 Claim Attachments via EDI
Fri, Jan 23, 2026
Effective Jan. 23, 2026, we're significantly streamlining the claims process by accepting electronic 275 Claim Attachment (CA) transactions through Electronic Data Interchange (EDI).
What This Means for You
No More Faxing or Mailing: Claims requiring attachments can now be submitted electronically, eliminating the need for traditional methods like faxing or mailing.
Faster Claim Processing: Electronic 275 CA submissions will lead to quicker processing times for your correctly submitted claims.
Reduced Administrative Burden: This enhancement is designed to save your practice time and resources, allowing your staff to focus more on patient care.
How to Get Started
To begin utilizing 275 CA transactions via EDI, contact your practice management vendor, trading partner, or technical support area. They will assist you in enabling this feature for your practice or facility. This enhancement applies to both professional and institutional claim submissions.
Our Commitment to You
This new capability builds on our previous integration of 275 claim attachments through Availity Essentials in April 2025. It's another step in Highmark's ongoing commitment to implement innovative solutions that simplify your interactions with us and support your vital work in delivering high-quality patient care.
What Are Acceptable 275 CA Transactions?
Electronic claim attachments (275 CA) are supplemental documents that provide additional patient medical information to the payer in support of your claim submission. The 275 CA enhancement — also known as ANSI ASC X12 275, Version 210 — will allow the batch submission of additional claim documentation.
Common attachments include laboratory results, information from the member’s electronic medical record (EMR), list of medications, and certificates of medical necessity (CMNs).
When to Submit a 275 CA Transaction?
Some claims require additional documentation to support accurate and efficient processing by Highmark.
Why Submit a 275 CA Transaction?
Sending necessary attachments electronically offers a faster, more streamlined, and cost-efficient process over mailing or faxing an attachment.
What Highmark Products are Eligible to Receive 275 CA transactions?
All Highmark products — including Commercial, Medicare Advantage and ACA — are eligible to receive 275 CA transactions. The inclusion of the correct Highmark NAIC code is critical for successful 275 CA transactions. NAIC codes can be found in Chapter 6, Unit 2 of the Highmark Provider Manual.
Where Can Trading Partners Go for More Information?
Share the following information with your trading partner, clearinghouse, practice management vendor, or technical support area:
Details for implementing the new 275 CA capability are included in the Provider Companion Guide, which is available on the Resources section of our regional EDI sites:
For technical questions regarding this enhancement, EDI Operations can be reached at 800-992-0246.
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