Denial Codes / CARC 16
Denial Code CARC 16: Claim Lacks Information or Has Submission Errors
CARC 16 means the claim was denied because it lacks information needed for adjudication or has a submission or billing error. It is one of the most common denials and one of the most recoverable, because the fix is usually a missing field, not a coverage dispute.
What this denial means
The payer is saying it could not adjudicate the claim as submitted because something required is missing or wrong. A remittance advice remark code (an RARC, the N-code next to it) almost always names the specific field. CARC 16 without reading its paired RARC is half the story.
Why it happens
In practice this is rarely a coverage problem. It is a data problem: a missing referring provider NPI, an absent tooth number or surface, a blank prior-authorization field, an ICD-10 code that does not support the procedure, or a missing attachment the payer expects for that code. The claim never reached a clinical reviewer. It bounced at intake.
The appeal angle that works
Read the RARC paired with the 16, correct exactly the field it names, and resubmit as a corrected claim rather than a fresh one. Because CARC 16 is an administrative bounce and not a medical-necessity determination, the turnaround is usually fast once the missing element is supplied. If the RARC points at documentation, attach it on resubmission instead of waiting for a second denial.
Questions
Is a CARC 16 denial worth appealing?
Usually yes, because it is an administrative bounce, not a coverage decision. The claim was denied for a missing or incorrect field, so correcting that field and resubmitting as a corrected claim typically resolves it without a formal appeal.
How do I know what information is missing on a CARC 16?
Read the RARC (the remark code, usually an N-code) printed next to the CARC 16 on the remittance advice. The CARC says a claim lacks information; the paired RARC names the specific missing element.
The next step
If a number in here matched your practice, that leak is measurable. The 12-Month Missing Money Scan reads your last twelve months of claims and finds the money already earned but never collected. 25% of what is recovered, 20% if you prepay. No recovery, no fee.
Get your 12-Month Missing Money Scan