Denial code

CARC 16 denial code: meaning & whether to appeal

CARC 16: the exact X12 wording, how it is classified, and whether it is worth appealing.

Appealant EditorialX12 verified3 min read

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.

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