CO 208 denial code
Claim adjustment reason code 208. Often reported as CO 208.
NPI does not match payer records
Unofficial reference. This is our own plain-English explanation, not the official code text. Payer rules differ. Verify with the payer and the official X12 code list. AlphaPrefix is not affiliated with X12, CMS or any payer. Data last updated .
What 208 means
The NPI on the claim is valid in form but does not line up with what the payer has on file for that provider.
The number itself is fine, but the payer's enrollment records tie it to a different provider, location or tax ID, or have no record of it at all.
This usually points to an enrollment or credentialing gap rather than a typo. Claims will keep failing until the payer's file and your claim agree.
Group codes seen with 208
On a remittance, 208 comes after a group code. These are the ones it is most often reported with:
- CO 208 (Contractual Obligation): The provider's side of the ledger. The reduction comes from the payer contract or a rule the provider has to follow, and the patient normally cannot be billed for it.
The payer chooses the group code for each adjustment, so the same reason code can appear with another group code on your remittance. Read the two together. More about group codes.
Common causes
- The provider is not yet enrolled or credentialed with this payer under that NPI.
- The claim pairs an individual NPI with a group NPI or tax ID the payer has not linked.
- The billing NPI was swapped with the rendering NPI on the claim.
- The provider's practice location or tax ID changed and the payer was not updated.
What to do next
- Compare the NPI, tax ID and address on the claim with the payer's enrollment record.
- Contact provider enrollment to update or complete the payer's file if it is out of date.
- Correct the billing and rendering provider fields if they were swapped, then resubmit.
- Track claims for that provider until enrollment is confirmed so they can be refiled.
Related codes
- 206 (reason code) NPI missing
- 207 (reason code) NPI in an invalid format
- 16 (reason code) Missing information or billing error
Source
Official wording: X12 Claim Adjustment Reason Codes list. The explanation on this page is our own plain-English wording, not the X12 text.
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