Claim adjustment reason code
Denial code CO-184 meaning
CARC 184, usually seen as CO-184: The prescribing or ordering provider is not eligible to order the service billed.
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- Reason code
- CARC 184
- Short name
- Ordering provider not eligible
- Plain meaning
- The prescribing or ordering provider is not eligible to order the service billed.
- Group codes
- CO-184: Contractual obligation. The provider absorbs the amount under its contract or the payer's rules. Do not bill the patient for it.
Plain-English summary written by Rivvi. X12 owns the CARC list and its exact wording, which is not reproduced here. Read it on the X12 CARC list (list dated November 1, 2025, checked October 23, 2026). This page does not decide how a claim is paid.
Common causes
- The ordering provider is not enrolled with the payer, or is not allowed to order this service.
- For Medicare, the ordering provider is not in PECOS.
What to check before resubmitting
- Check the ordering provider's NPI, name and enrollment.
- Correct the ordering provider on the claim.
Remark codes that often come with it
Related reason codes
Related pages
Questions
What does denial code CO-184 mean?
The prescribing or ordering provider is not eligible to order the service billed. This is Rivvi's plain-English summary of CARC 184. X12's exact wording is on x12.org.
How do I fix CO-184?
Check the ordering provider's NPI, name and enrollment. Correct the ordering provider on the claim.
Can I bill the patient for CO-184?
With group code CO, no. CO means the provider absorbs the amount under its contract or the payer's rules.
Which group codes come with CARC 184?
Most often CO (contractual obligation). The group code, not the reason code, says who owes the amount.
What is the difference between a CARC and a RARC?
A claim adjustment reason code (CARC) says why a claim line was paid differently than billed. A remittance advice remark code (RARC) adds detail, such as which field is missing.