CO-207CO group · Administrative

CO-207 denial code: National Provider Identifier is not valid

CO-207 is a stricter edit than a missing identifier: a number is present, and it does not pass. That narrows the cause considerably.

CO-207 fires when an NPI submitted on the claim is not a valid identifier. An NPI is ten digits with a check digit, so an invalid one is either mistyped, the wrong length, or a number that has been deactivated in the national registry.

What CO-207 means

The payer validated the identifier and it failed. Because the NPI carries a check digit, a single transposed character produces an invalid number rather than someone else's — which is useful, since it means a CO-207 is almost never pointing at the wrong provider, only at a mistyped or retired one. Deactivated numbers are the cause practices miss most, particularly after a retirement, a practice sale, or an individual number left in a template after the provider left.

Why CO-207 fires

  • A digit was transposed or dropped when the number was entered or mapped.
  • A legacy or state identifier was submitted where an NPI was expected.
  • The NPI was deactivated in the national registry and no longer validates.
  • A group NPI was placed in an individual field, or the reverse, and fails that field's validation.

Is CO-207 worth appealing?

Sometimes worth appealing

Correct and resubmit. The only appeal here is over timely filing when the correction falls outside the window and the original submission did not.

How to resolve or appeal CO-207

  1. 1

    Check the number in the registry

    Confirm the NPI is active and belongs to the entity type the field expects before assuming it was mistyped.

  2. 2

    Correct at the source

    Fix it in the practice management record, not only on this claim, or the same edit will fire on every claim built from the same template.

  3. 3

    Resubmit as corrected

    Send it as a correction so the original receipt date is preserved.

CO-207 — frequently asked

Can an NPI stop being valid?
Yes. Numbers are deactivated on retirement, death or at the provider's request, and a deactivated number fails validation from that date forward even though it was correct for years.
Is this the same as CO-208?
No. CO-207 means the number itself does not validate. CO-208 means the number is valid but does not match what the payer has on file for that provider — a different problem with a different fix.

Related guides

CO-206 · AdministrativeCO-208 · AdministrativeCO-16 · Administrative

Sources

Reason-code meanings are paraphrased from the X12 Claim Adjustment Reason Code list for plain-language reference; they are not reproduced verbatim. This is general information, not legal, coding, or medical advice — always confirm against the payer's remittance and policy.

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