835 Denial Combination

CO-16+N286

CO

Contractual Obligation · Service-Line Level Adjustment

Missing Information

What This Combination Means

The claim was denied because the referring provider's primary identifier (typically NPI) is either absent, incomplete, or invalid in the claim submission. The payer requires this information to process the claim under contractual terms. The provider must write off the denied amount and cannot balance bill the patient for this billing error.

Financial Responsibility

provider writeoff

The provider must absorb this adjustment as a contractual write-off because the claim contained a billing error related to referring provider identification. The patient has no financial liability for this submission error.

N/A

Appeal Success

2-4 weeks (corrected claim reprocessing)

Avg. Resolution

Medium

Difficulty

No

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-16+N286 combination — not generic advice.

Not Appealable:This is a correctable billing error requiring claim resubmission with proper referring provider information, not an appeal of a coverage or payment determination.
  1. 1

    Verify the referring provider's current NPI and taxonomy code

    Check NPPES registry to confirm the referring provider's active Type 1 (individual) NPI that should be reported in loop 2310A of the 837 claim

  2. 2

    Confirm referring provider information matches payer requirements

    Ensure the NPI qualifier and identifier format align with this specific payer's submission guidelines, as some payers require additional legacy identifiers alongside NPI

  3. 3

    Submit a corrected claim with complete referring provider identification

    Resubmit using claim frequency code 7 with properly populated referring provider NPI in the appropriate field, ensuring all required identifier elements are present and valid

Specialty Context

How CO-16+N286 typically presents across different practice types.

Dental

Medical

Common for referral-dependent specialties including radiology, laboratory services, physical therapy, and specialist consultations where referring provider NPI is mandatory for medical necessity documentation and network compliance verification

Behavioral Health

Frequently occurs when primary care physicians refer patients for psychiatric evaluation or therapy services, as referring provider information is often required for coordinated care documentation and authorization validation

Individual Code References

View the standalone definition for each code in this combination.

CARC 16RARC N286

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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