AGAR Guide

Provider & Credentialing

AR Guide Knowledge

Provider type, enrollment, credentialing, network status, and facility certification issues.

Denial Decoder

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Check first

Check these before anything else

  • Provider enrollment / credentialing status with the payer
  • NPI and taxonomy on file
  • Rendering vs. billing provider on the claim
  • Network status for the date of service
  • Facility certification for the specific service
  • CARC 170 / 208 / 242 and the accompanying remark code

Verify payer-specific rules: Heads up

Enrollment, credentialing and network requirements are payer-specific and change over time. Confirm the provider's status with the payer for the exact date of service before appealing or resubmitting.

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What it means

The payer will not pay because of something about the provider — the provider type cannot bill the service, the provider is not enrolled or credentialed with the payer, the facility is not certified for the service, or an out-of-network provider was used when network status matters.

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Common causes

  • Provider type or specialty not recognized for the service
  • Provider not enrolled or credentialed with the payer
  • NPI not matched to the payer's records
  • Facility not certified for the billed service
  • Out-of-network provider used for a service requiring network status

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What AR should verify

  • Confirm the provider's enrollment and credentialing status with the payer
  • Verify the NPI against the provider's enrollment records
  • Check the rendering vs. billing provider on the claim
  • Confirm the facility's certification for the specific service
  • Check the provider's network status for the date of service

Recommended workflow

What to do next

  1. Complete provider enrollment or credentialing, then resubmit
  2. Correct the provider information (NPI, taxonomy) and resubmit
  3. Have the appropriate provider type bill the service if scope rules apply
  4. If the arrangement is correct, appeal with provider credentials or certification documentation

Don’t assume

Avoid these shortcuts

  • The provider is enrolled just because they have billed before
  • The NPI on the claim matches the payer's records
  • The rendering provider was the one billed
  • Network status is the same across all payers
  • A credentialing denial means the service was not rendered

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Documentation

  • Provider enrollment and credentialing confirmation
  • NPI and taxonomy records
  • Facility certification documentation
  • Network status verification for the date of service

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Escalation

  • Credentialing: when enrollment is incomplete or lapsed
  • Client: when provider information was provided incorrectly
  • Supervisor: when the payer's provider records are incorrect despite enrollment

QA checkpoint

Confirm before closing

  • Verify provider enrollment before billing a new payer
  • Track credentialing renewals and NPI updates
  • Confirm the rendering provider matches the service billed

AR Guide knowledge

Related guides

Missing InformationEligibility & Coverage

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.

About this guidance: Note

AR Guide knowledge is general reference content written by our team — it is not payer-specific policy and never replaces the payer’s documentation or your contract. Always confirm specifics with the payer.