What CO-16 means
The claim is missing information or contains a submission error. CO-16 almost always travels with a RARC (remark code) that pinpoints the exact missing element — fix it and resubmit.
Common causes
- Missing or invalid modifier, NPI, or referring provider
- Diagnosis pointer or required field left blank
- An accompanying RARC specifies the precise defect
How to appeal CO-16
Read the RARC that accompanies the CO-16 to identify the exact missing field, correct it, and resubmit with any required documentation. Most CO-16s are correct-and-resubmit, not formal appeals.
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Remitavo drafts a payer-specific CO-16appeal — citing the carrier's own policy — straight from your remittance file. Send a sample and we'll show you.
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