How do I resolve a CO-16+M55 denial?

Verify whether the anti-emetic drug was administered with a covered oral anti-cancer drug: The claim must demonstrate the drug was given in conjunction with anti-cancer treatment to meet coverage criteria If anti-cancer drug relationship exists, submit corrected claim with both the anti-emetic and associated oral anti-cancer drug codes: Include documentation showing the anti-emetic was administered as part of covered anti-cancer therapy If no anti-cancer drug relationship exists, write off the denied amount and educate patient about coverage limitations: Self-administered anti-emetics without accompanying oral anti-cancer treatment are not covered under this plan

835 Denial Combination

CO-16+M55

Contractual Obligation · Claim-Level Adjustment

Missing Information

What This Combination Means

The claim for anti-emetic medication was denied due to a billing error or missing information related to the coverage criteria for self-administered anti-emetic drugs. The payer is indicating that these drugs are only reimbursable when administered in conjunction with a covered oral anti-cancer medication, and the claim either failed to demonstrate this connection or was billed incorrectly.

Financial Responsibility

provider writeoff

The provider must write off the denied amount per contractual obligation. The patient cannot be billed for this anti-emetic drug that did not meet coverage criteria.

N/A

Appeal Success

Immediate (write-off)

Avg. Resolution

Easy

Difficulty

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-16+M55 combination — not generic advice.

Not Appealable:This is a CO group code submission error for a service that does not meet the payer's coverage criteria without accompanying oral anti-cancer treatment.

1
Verify whether the anti-emetic drug was administered with a covered oral anti-cancer drug
The claim must demonstrate the drug was given in conjunction with anti-cancer treatment to meet coverage criteria
2
If anti-cancer drug relationship exists, submit corrected claim with both the anti-emetic and associated oral anti-cancer drug codes
Include documentation showing the anti-emetic was administered as part of covered anti-cancer therapy
3
If no anti-cancer drug relationship exists, write off the denied amount and educate patient about coverage limitations
Self-administered anti-emetics without accompanying oral anti-cancer treatment are not covered under this plan

Specialty Context

How CO-16+M55 typically presents across different practice types.

Dental

Medical

Common in oncology practices billing for anti-nausea medications (ondansetron, aprepitant) where the claim must clearly link the anti-emetic to a covered oral chemotherapy agent like capecitabine or temozolomide

Behavioral Health

Individual Code References

View the standalone definition for each code in this combination.

CARC 16 RARC M55

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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