EDI 277CA: Claim Acknowledgment
The EDI 277CA (Claim Acknowledgment) is the X12 transaction a payer returns after an 837 to report whether each claim passed pre-adjudication validation — the payer's business-rule edits. Unlike the technical TA1 and 999, the 277CA reflects data problems in specific claims that the billing team must correct and resubmit. Accepted claims then move to adjudication.
- Transaction
- 277CA — Claim Acknowledgment
- Direction
- Payer to provider (inbound)
- Pairs with
- 837 claim; follows TA1 and 999
What is the 277CA?
The 277CA is the payer telling you which of your submitted claims made it past the front door. After an 837 clears the envelope and syntax checks, the payer applies its own pre-adjudication business edits — is the member ID valid, does the provider exist in the network file, are required fields present — and returns a 277CA marking each claim accepted or rejected.
It is the last checkpoint before adjudication. A claim rejected here never reaches an 835.
How does it differ from the TA1 and 999?
| Ack | Checks | Who fixes it |
|---|---|---|
| TA1 | Interchange envelope integrity | EDI/software team |
| 999 | X12 syntax and implementation-guide edits | EDI/software team |
| 277CA | Claim-level business data | Billing team |
The TA1 and 999 are technical; the 277CA is a data problem for billers to correct.
How do you work a 277CA rejection?
- Pull the 277CA and read the claim status category and status codes for each rejected claim.
- Correct the underlying data — subscriber ID, provider NPI, diagnosis, required field.
- Resubmit as a corrected/new 837; there are no appeal rights because it never adjudicated.
- Track it — the timely-filing clock does not pause while a claim sits rejected.
Why do 277CA rejections get missed?
Frequently asked questions
The 277CA is the payer's claim-level acknowledgment of an 837. After the file passes the envelope (TA1) and syntax (999) checks, the payer runs each claim through pre-adjudication business edits and returns a 277CA saying, claim by claim, whether it was accepted for adjudication or rejected. A rejected claim never adjudicates and never appears on an 835 until you fix and resubmit it.
A 277CA rejection happens before adjudication — the claim was never processed, so there is no denial code on an 835, no appeal rights, and often no visibility in denial reports. A denial happens after adjudication and comes on the 835 with a CARC. A 277CA rejection is corrected and resubmitted as if it were a new claim; the timely-filing clock keeps running.
The 277CA uses X12 Claim Status Category Codes and Claim Status Codes to explain the acknowledgment. A category code gives the high-level status (accepted, rejected, pending) and the status code gives the specific reason — for example, a missing or invalid subscriber ID, an invalid provider identifier, or a missing required element.
Sources & further reading
Reviewed by the ImmediCare Solutions RCM team
Certified billers and coders handling claims across 50+ specialties nationwide. This entry is reviewed against current payer policy and CMS rules. Last review: Jul 5, 2026.
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