835 Denial Combination

CO-16+N394

CO

Contractual Obligation · Service-Line Level Adjustment

Missing Information

What This Combination Means

The claim was denied because the submitted progress notes or clinical report were either incomplete or did not meet payer validity standards. This is a submission error under the provider's contractual obligation to submit complete documentation, requiring the provider to write off the adjusted amount. The claim cannot be paid until properly documented progress notes are submitted.

Financial Responsibility

provider writeoff

The provider must write off the denied amount per contractual obligations with the payer. The patient cannot be billed for this adjustment because it results from the provider's failure to submit complete or valid progress notes.

N/A

Appeal Success

15-30 days (corrected claim submission)

Avg. Resolution

Medium

Difficulty

No

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-16+N394 combination — not generic advice.

Not Appealable:This is a CO group code for a submission error (incomplete/invalid progress notes), not a clinical or medical necessity dispute, making it a contractual write-off rather than an appealable denial.
  1. 1

    Retrieve the original progress notes submitted with the claim

    Identify specifically what was missing or invalid by comparing to payer documentation requirements for progress notes (date, signature, clinical content, treatment details)

  2. 2

    Obtain complete and compliant progress notes from the treating provider

    Ensure notes include all required elements: patient identification, service date, clinical findings, treatment provided, provider signature, and credentials per payer standards

  3. 3

    Submit a corrected claim with complete progress notes attached

    Use claim frequency code 7 (replacement) and include the complete, valid progress report addressing the deficiencies identified in the original submission

Specialty Context

How CO-16+N394 typically presents across different practice types.

Dental

Medical

Common for office visits, physical therapy, and chronic care management where detailed progress notes documenting treatment plans, patient response, and ongoing assessment are required for claim adjudication

Behavioral Health

Particularly frequent in behavioral health claims where progress notes must document treatment plan adherence, symptom changes, functional status, and medical necessity for continued therapy sessions

Individual Code References

View the standalone definition for each code in this combination.

CARC 16RARC N394

Medicare Contractor Guidance for CARC 16

FCSO + Noridian + uhc + aetna + bcbs_az

This RUC is received when a claim is submitted with missing, incorrect, or invalid information. For details pertaining to your claim, please refer to the remittance advice remark codes (RARCs) on the remittance advice (RA).

How to Prevent CARC 16 Denials

  • ✓

    Review the RARC on the remittance advice to identify which specific field has the error.

  • ✓

    Per Medicare guidelines, claims must be filed no later than 12 months after the date of service. RUCs are not considered filed/submitted.

CMS guidelines for completion of form CMS-1500 in the Medicare Claims Processing Manual (100-04), Chapter 26SPOTFee Schedule Lookup ToolCMS laboratory demographics lookupModifier lookup toolNoridian Medicare PortalNMPIVRSame or SimilarPECOSPDAC

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Synthesized from official definitions — not from training data

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