835 Denial Combination

CO-45+N435

CO

Contractual Obligation · Service-Line Level Adjustment

Contractual Obligation

What This Combination Means

This combination indicates the payer reduced the charge because the service was provided more frequently than the contracted fee schedule or policy allows for the given time period, and no documentation was submitted to support medical necessity for the additional frequency. The reduction is a contractual adjustment, not a fee schedule reduction based solely on rate differences. The RARC clarifies that the CARC 45 adjustment is specifically due to exceeding frequency limits rather than standard rate discrepancies.

Financial Responsibility

provider writeoff

The provider must write off the adjusted amount per contractual obligation. This amount represents the portion of the charge that exceeded allowed frequency limits and cannot be balanced billed to the patient.

N/A

Appeal Success

Immediate (write-off)

Avg. Resolution

Easy

Difficulty

No

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-45+N435 combination — not generic advice.

Not Appealable:This is a contractual fee schedule adjustment based on frequency limitations in the provider's contract with the payer, which is not subject to appeal.
  1. 1

    Post the contractual adjustment to the patient account

    Write off the amount identified as exceeding frequency limits per the contracted fee schedule

  2. 2

    Review contract frequency limitations for this service code

    Verify the specific frequency caps or time period limits in your payer contract to understand what triggered this adjustment

  3. 3

    Update authorization or scheduling protocols

    Implement checks to identify frequency-limited services at scheduling or authorization stages to prevent future contractual adjustments

Specialty Context

How CO-45+N435 typically presents across different practice types.

Dental

Common for prophylaxis cleanings billed more than twice per benefit year, fluoride treatments exceeding age or frequency limits, or bitewing X-rays performed beyond the contracted schedule (e.g., twice per calendar year).

Medical

Frequently seen with physical therapy visits exceeding per-period limits, routine preventive services billed too frequently (e.g., annual wellness visits, screening mammograms), or injections with defined frequency caps in the contract.

Behavioral Health

Typical for outpatient therapy sessions exceeding contracted visit limits per time period without prior authorization, or psychological testing billed more frequently than the contracted allowance specifies.

Individual Code References

View the standalone definition for each code in this combination.

CARC 45RARC N435

Medicare Contractor Guidance for CARC 45

Noridian

Payment was made for this claim conditionally because an HHA episode of care has been filed for this patient.

How to Prevent CARC 45 Denials

  • ✓

    Ensure eligibility is verified in the Noridian Medicare Portal for Home Health Episode History (HHEH)

  • ✓

    Utilize the Consolidated Billing Tool on the Noridian Medicare website to inquire on items covered in a HHA episode of care, prior to providing

Noridian Medicare PortalConsolidated Billing ToolFee Schedule

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Synthesized from official definitions — not from training data

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