835 Denial Combination

CO-50+N115

CO

Contractual Obligation · Service-Line Level Adjustment

Medical Necessity

What This Combination Means

The service was denied as medically unnecessary based on a specific Local Coverage Determination policy. The RARC N115 directs you to the exact LCD that defines coverage criteria for this service. This combination indicates the denial is grounded in published Medicare contractor policy rather than generic medical necessity criteria.

Financial Responsibility

provider writeoff

The provider must write off the denied amount per contractual obligation with the payer. The patient cannot be billed for this adjustment.

65%

Appeal Success

60-90 days (appeal process)

Avg. Resolution

Hard

Difficulty

Yes

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-50+N115 combination — not generic advice.

Appealable:Medical necessity denials based on LCD criteria are appealable when clinical documentation supports that coverage requirements were met.
  1. 1

    Access the specific LCD referenced in the denial

    Visit www.cms.gov/mcd or contact the contractor to obtain the exact LCD policy that governed this denial decision

  2. 2

    Compare clinical documentation against LCD coverage criteria

    Verify whether the service met all specified indications, frequency limitations, diagnosis requirements, and documentation standards outlined in the LCD

  3. 3

    Prepare and submit a formal appeal with LCD-specific justification

    If documentation supports coverage under the LCD criteria, file an appeal including the clinical records and a detailed explanation of how each LCD requirement was satisfied

Specialty Context

How CO-50+N115 typically presents across different practice types.

Dental

Medical

Common for diagnostic tests, durable medical equipment, surgical procedures, and therapeutic services where LCDs define specific coverage parameters such as qualifying diagnoses, frequency limits, or prior conservative treatment requirements

Behavioral Health

May apply to intensive outpatient programs, psychological testing, or extended therapy sessions where LCDs establish medical necessity thresholds, diagnosis criteria, or session limits for Medicare coverage

Individual Code References

View the standalone definition for each code in this combination.

CARC 50RARC N115

Medicare Contractor Guidance for CARC 50

FCSO + Noridian + uhc + aetna + bcbs_az

This denial reason code is received when a procedure code is billed with an incompatible diagnosis for payment purposes, and the ICD-10 code(s) submitted is/are not covered under an LCD or NCD.

How to Prevent CARC 50 Denials

  • ✓

    Refer to the Active / Future / Retired LCDs medical coverage policies for a list of procedure codes relating to services addressed in the LCD, and the diagnoses for which a service is or is not considered medically reasonable and necessary.

  • ✓

    Report only the diagnosis(es) for the treatment date of service.

  • ✓

    Be proactive, and stay informed on Medicare rules and regulations, and maximize the self-service tools available on the First Coast website.

CMS IOM Pub. 100-08, Chapter 13 - Local Coverage DeterminationsNoridian Medicare PortalModifier Lookup Tool

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Synthesized from official definitions — not from training data

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