CARC 16 Denial Appeal
Lacks information / billing error
Claim/service lacks information or has submission/billing error(s) which is needed for adjudication. At least one Remark Code must be provided.
Why CARC 16 hits behavioral-health claims
BH claims require specific modifiers, taxonomy matches, and session times; CARC 16 is a 'wrapper' code — the payer pauses adjudication until you supply the exact field named by the accompanying remark code (RARC).
The winning argument
The claim contained all standard required information; the specific item named by the accompanying RARC is now supplied/attached, and the claim must be reprocessed.
- Identify the exact missing element from the paired RARC and correct only that.
- Requests exceeding standard X12 requirements are an administrative burden that should be documented.
Public sources you can cite
Every argument traces to a verified public source — no invented citations.
Sample appeal letter body
Replace the {{placeholders}} with your own information before sending.
This letter is an appeal and corrected submission for the claim for {{patient_reference}} on {{dates_of_service}}, denied under CARC 16 (lacks information) with remark code {{rarc_code}}. We have supplied the specific item identified by that remark code: {{missing_information_provided}}. All required clinical and demographic fields compliant with X12 standards are included. Please reprocess this claim for payment.You'll need to supply: patient_reference, dates_of_service, rarc_code, missing_information_provided
What this argument cannot ground
Honest gaps — no fabricated sources.
- CARC 16 is administrative; there is no BH-specific parity argument for the code itself — only for the underlying item the RARC requests.
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