835 Denial Combination

CO-16+N285

CO

Contractual Obligation · Claim-Level Adjustment

Missing Information

What This Combination Means

The claim was denied due to a missing, incomplete, or invalid referring provider name. This is a contractual billing error where the payer requires complete referring provider information but the submitted claim failed to include it properly. The provider must absorb this adjustment under their contract terms.

Financial Responsibility

provider writeoff

The provider must write off the denied amount per their contractual agreement with the payer. The patient cannot be billed for this contractual adjustment resulting from the billing error.

N/A

Appeal Success

1-2 billing cycles after corrected resubmission

Avg. Resolution

Medium

Difficulty

No

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-16+N285 combination — not generic advice.

Not Appealable:This is a contractual adjustment for a correctable billing error, not a medical necessity or coverage dispute; the proper remedy is claim correction and resubmission.
  1. 1

    Verify referring provider information in claim system and original documentation

    Confirm the referring provider NPI, name spelling, credentials, and completeness match payer enrollment records and claim submission requirements

  2. 2

    Update claim with complete and accurate referring provider name in all required fields

    Ensure referring provider name exactly matches the format required by the payer (first name, last name, credentials) and is linked to a valid NPI in Loop 2310A or applicable field

  3. 3

    Resubmit as a corrected claim using appropriate claim frequency code

    File with frequency code 7 (replacement claim) and include the original claim reference number to ensure proper adjudication with the corrected referring provider information

Specialty Context

How CO-16+N285 typically presents across different practice types.

Dental

Dental referrals from general dentists to specialists (endodontists, oral surgeons, periodontists) require complete referring provider information; ensure referring dentist NPI and name are accurately captured at time of specialist appointment scheduling.

Medical

Common in specialties requiring referrals such as physical therapy, specialist consultations, diagnostic imaging, and procedures; verify PCP or referring physician information is complete in practice management system before claim submission.

Behavioral Health

Behavioral health claims often require referring provider information when patients are referred by PCPs, psychiatrists, or other mental health professionals; ensure intake forms capture complete referring provider details including full legal name and NPI.

Individual Code References

View the standalone definition for each code in this combination.

CARC 16RARC N285

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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