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CARC 16Missing Information Appealable

Claim/service lacks information or has submission/billing error(s)

Quick Action: Read the RARC code to identify the exact missing info, correct it, and resubmit within 48 hours.
Typically seen with:CO — Contractual ObligationOA — Other Adjustment
~85.00%
Estimated appeal win rate for CARC 16 denials

What Does CARC 16 Mean?

CARC 16 — "Claim/service lacks information or has submission/billing error(s)" — is a Claim Adjustment Reason Code used by payers to indicate why a claim or service line was adjusted. This code falls under the Missing Information category.

Common Causes

Here are the most common reasons this denial code appears on your remittance advice:

  • Missing or invalid patient demographics (name, DOB, member ID)
  • Incorrect or missing National Provider Identifier (NPI)
  • Diagnosis codes that are outdated, invalid, or not coded to highest specificity
  • Missing referring or ordering provider information
  • Submission or billing format errors in the claim data

Is CARC 16 Appealable?

Yes, CARC 16 is appealable. With proper documentation and a well-crafted appeal, this denial code has an estimated win rate of approximately 85.00%. This is one of the higher-success-rate denial codes — prioritize these appeals.

How to Appeal CARC 16

Follow these steps to maximize your chances of a successful appeal:

1 Read the paired RARC code — it tells you exactly what information is missing
2 Cross-reference claim data against the patient's insurance card and EHR records
3 Correct the specific error identified by the RARC code
4 Resubmit with frequency code 7 (replacement claim) within 48 hours
5 Do NOT formally appeal — this is a correction, not a dispute

Related RARC Codes

These Remittance Advice Remark Codes are commonly paired with CARC 16. The RARC tells you the specific reason for the adjustment.

M76 Missing/incomplete/invalid diagnosis or condition
MA04 Secondary payment cannot be considered without the identity of or payment information from the primary payer
MA130 Your claim contains incomplete and/or invalid information, and no appeal rights are afforded because the claim is unprocessable
MA36 Missing/incomplete/invalid patient name
N30 Patient ineligible for this service
N362 The number of Days or Units of Service exceeds our acceptable maximum
N386 This decision was based on a National Coverage Determination (NCD)

Appeal Letter Template

.DOCX

Customize the fields below to generate a ready-to-send appeal letter for CARC 16. Downloads as a formatted Word document.

Letter Body (editable)

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March 26, 2026

[Payer Name]

[Payer Address]

RE: Appeal for Claim #[Claim Number]
Patient: [Patient Name] | Member ID: [Member ID]
Date of Service: [Date of Service] | Denied Amount: $[Denied Amount]

Dear Claims Review Department,

I am writing to formally appeal the denial of the above-referenced claim, denied with CARC 16: "Claim/service lacks information or has submission/billing error(s)".

Our appeal is based on the following:

  • Read the paired RARC code — it tells you exactly what information is missing
  • Cross-reference claim data against the patient's insurance card and EHR records
  • Correct the specific error identified by the RARC code
  • Resubmit with frequency code 7 (replacement claim) within 48 hours
  • Do NOT formally appeal — this is a correction, not a dispute

We have reviewed the common reasons for this denial and can confirm that the following do not apply to this claim:

  • Missing or invalid patient demographics (name, DOB, member ID)
  • Incorrect or missing National Provider Identifier (NPI)
  • Diagnosis codes that are outdated, invalid, or not coded to highest specificity
  • Missing referring or ordering provider information
  • Submission or billing format errors in the claim data

Recommended action: Read the RARC code to identify the exact missing info, correct it, and resubmit within 48 hours.

Enclosed please find supporting documentation for your review. We respectfully request reconsideration and payment of $[Denied Amount].

Sincerely,

[Provider Name]

[NPI] | [Phone]

[Practice/Organization Name]

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