835 Denial Combination

CO-16+N312

CO

Contractual Obligation · Claim-Level Adjustment

Missing Information

What This Combination Means

The payer has denied or adjusted this claim because the begin therapy date is missing, incomplete, or invalid, resulting in a submission error. This is a contractual adjustment that the provider must write off, indicating the claim was submitted with insufficient date information to process the therapy services. The RARC N312 specifies that the begin therapy date field is the exact data element causing the CARC 16 billing error.

Financial Responsibility

provider writeoff

The provider must write off this amount as a contractual obligation. The patient cannot be billed for this adjustment because the error stems from the provider's incomplete claim submission.

N/A

Appeal Success

7-14 days (corrected claim processing)

Avg. Resolution

Medium

Difficulty

No

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-16+N312 combination — not generic advice.

Not Appealable:This is a billing error due to missing required information, not a medical necessity or coverage determination, and must be corrected through claim resubmission rather than appeal.
  1. 1

    Locate the original therapy documentation and identify the valid begin therapy date

    The begin therapy date must reflect when the patient actually started the course of treatment, documented in clinical records

  2. 2

    Enter the complete begin therapy date in the appropriate claim field using CCYYMMDD format

    For institutional claims this is typically FL 12 (Admission Date) or condition codes; for professional claims it may be box 14 or box 19 depending on payer requirements

  3. 3

    Submit a corrected claim with frequency code 7 including the now-complete begin therapy date

    Ensure all other claim elements remain identical to avoid creating a duplicate claim scenario

Specialty Context

How CO-16+N312 typically presents across different practice types.

Dental

Medical

Common in physical therapy, occupational therapy, speech therapy, and rehabilitation services where begin therapy dates establish the baseline for progress reporting and plan of care timelines

Behavioral Health

Relevant for partial hospitalization programs, intensive outpatient programs, and ongoing psychotherapy where the begin therapy date establishes treatment episode parameters and may affect authorization periods

Individual Code References

View the standalone definition for each code in this combination.

CARC 16RARC N312

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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