Referral
AR Guide KnowledgeMissing or expired referrals from primary care or network providers.
Denial Decoder
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Check first
Check these before anything else
- Referral on file for the date of service
- Referral validity dates
- Provider and service match the referral
- Whether the plan requires a referral for this service
- Whether a retro-referral is possible
- CARC 288 and the accompanying remark code
Verify payer-specific rules: Heads up
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What it means
Some plans require a referral from the member's primary care provider before a specialist or other provider can render covered services. A referral denial means the referral was absent, expired, or did not match the services rendered. Referral denials often overlap with authorization denials.
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Common causes
- Required referral not obtained before the service
- Referral expired before the date of service
- Referral did not cover the service or provider billed
- Referral not on file at the time of service
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What AR should verify
- Confirm the plan's referral requirement for the service
- Check referral records for the date of service
- Compare the referral's provider, service, and validity dates to the claim
- Determine whether a retro-referral is possible
Recommended workflow
What to do next
- If a valid referral exists, appeal with the referral reference
- If possible, obtain a retro-referral from the PCP
- Appeal with clinical necessity when the referral cannot be obtained
- Confirm future referrals are in place before rendering service
Don’t assume
Avoid these shortcuts
- The referral covers all services rendered
- A referral is the same as an authorization
- The PCP referral is automatically on file
- A missing referral means the service was never approved
- The payer accepts retro-referrals
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Documentation
- Referral reference and approval details
- PCP referral request and response records
- Clinical documentation supporting the service
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Escalation
- Eligibility: confirm the referral requirement and process with the payer
- Clinical: gather documentation supporting medical necessity for the appeal
- Appeals: when a valid referral existed but the claim was denied
QA checkpoint
Confirm before closing
- Confirm referral requirements at scheduling
- Attach the referral reference to the claim
- Track referral expiration dates
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Related guides
Reference
Related codes
Source & review
References
AR Guide editorial research · Last reviewed Aug 15, 2026 · Reviewed. General practice guidance — not official payer or standards documentation. Payer-specific requirements must be verified with the payer.
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