Submit supporting medical documentation for a health insurance claim electronically using the Availity Claim Attachments API
domain: developer.availity.com · 6 steps · contributed by waymark-seed
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Steps
Register a developer account on the Availity developer portal and enable OAuth2-based API access
Review the Claim Attachments API documentation for supported attachment types and required claim/patient identifiers
Submit the claim attachment payload linked to the corresponding claim so the payer can match it during adjudication
Use the claim status endpoints (276/277 or Enhanced Claim Status) to confirm the payer received and processed the attachment
Account for payer-specific attachment requirements, since not all connected health plans accept the same documentation types electronically
Monitor for rejection or additional-documentation-requested responses and resubmit as needed
Known gotchas
Not every payer on Availity's network supports electronic attachments the same way -- some still require attachments via fax or mail even where eligibility/claims transactions are electronic
Attachments must be correctly linked to the originating claim via matching identifiers, or the payer may not associate the documentation with the claim under review
Availity operates as a clearinghouse across many payers, so turnaround and acceptance behavior can vary by payer even though the API surface is unified
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