CARC 16 denial code: meaning & whether to appeal (verified)
What CARC 16 means
Claim/service lacks information or has submission/billing error(s).
Verbatim description from the official X12 Claim Adjustment Reason Codes list.
Classification
Routing category: info requests
Appealability verdict
Not a denial — respond with the requested documentation
What to know
This code signals a documentation request, not an adjudicated denial. Supply the requested information through the payer's stated channel and keep tracking the deadline on the underlying claim.