Enroll as a trading partner in the Availity developer portal (developer.availity.com) and obtain OAuth 2.0 client credentials; all Availity REST API calls require an OAuth bearer token.
Construct a well-formed X12 270 batch file per the 005010X279A1 implementation guide: one ISA/GS envelope, one ST per subscriber group, Loop 2000C per subscriber with NM1*IL (insured) and one EQ segment per service type being queried.
Submit the batch file to the Availity HIPAA Transaction API batch eligibility endpoint; retrieve the transaction ID from the response and poll for completion using the status endpoint.
When the 271 response file is available, correlate each 271 subscriber loop back to the original 270 using TRN02 (subscriber trace number) which you assigned at submission time.
Parse each 271 EB segment, map coverage status to appointment records, and flag any subscriber where EB01=1 (inactive/no coverage) or where an AAA rejection is present.
Write the reconciliation results to a structured store and trigger re-verification workflows for any patient whose coverage status changed since the last check.
Known gotchas
Availity requires trading partner enrollment before transactions are accepted; attempting API calls without completed enrollment returns authorization errors that look like credential failures.
Batch 271 files can contain responses interleaved from multiple payers if your 270 routed to multiple networks; always key reconciliation on TRN02, not on file position.
Availity's OAuth token has a limited TTL; long-running batch jobs must refresh the token before expiry or all mid-job requests will return 401.
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