835 Denial Combination
CO-236+N184
Contractual Obligation · Service-Line Level Adjustment
Coding ErrorWhat This Combination Means
The claim was denied because procedures billed together on the same date violate NCCI coding edits or state fee schedule bundling rules. The payer is specifically instructing that the technical component (TC modifier 26 or no modifier) and professional component (modifier 26 or TC) must be submitted on separate claim lines or separate claims rather than bundled together.
Financial Responsibility
provider writeoff
The provider must write off the denied amount as a contractual adjustment. The patient cannot be billed for services denied due to incorrect coding or bundling that violates payer coding policies.
N/A
Appeal Success
1-2 billing cycles after corrected claim submission
Avg. Resolution
Medium
Difficulty
No
Appealable
Step-by-Step Resolution
Steps tailored specifically to this CO-236+N184 combination — not generic advice.
- 1
Identify the procedure codes and modifiers that were bundled inappropriately on the original claim
Determine which services represent the technical component versus the professional component based on the original claim submitted
- 2
Separate the technical and professional components onto distinct claim lines with appropriate modifiers (26 for professional, TC for technical)
Ensure each component is billed with the correct modifier to indicate separate services as required by NCCI and payer policy
- 3
Submit corrected claim with frequency code 7 showing the separated technical and professional component billing
Reference the original claim number and ensure all supporting documentation reflects the separated component billing structure
Specialty Context
How CO-236+N184 typically presents across different practice types.
Dental
Medical
Common for radiology, pathology, and cardiology services where technical equipment/facility charges must be separated from physician interpretation charges; frequently seen with diagnostic imaging and laboratory procedures
Behavioral Health
Rare in behavioral health as most services do not typically involve separate technical and professional components; may apply to psychological testing with equipment-based assessments
Individual Code References
View the standalone definition for each code in this combination.
Medicare Contractor Guidance for CARC 236
FCSO + uhc + aetna + bcbs_azThis procedure or procedure/modifier combination is not compatible with another procedure or procedure/modifier combination provided on the same day according to the National Correct Coding Initiative. This denial is received when the service(s) has/have already been paid as part of another service billed for the same date of service.
How to Prevent CARC 236 Denials
- ✓
If an NCCI associated modifier is clinically appropriate, apply the appropriate modifier to the minor/column 2 code only. Effective with date of service July 1, 2019, modifier 59 or subsets may be applied to either the major or minor code for Part B services only.
- ✓
Refer to the modifier policy indicator column in the PTP edit tables: 0=modifier not allowed, 1=modifier is allowed, 9=not applicable.
- ✓
Never append a modifier to solely bypass an NCCI PTP edit.
- ✓
Validate for the appropriate procedure/modifier combination via the Modifier lookup tool.
- ✓
Procedures are to be reported with the most comprehensive code.
- ✓
Stay up to date with the quarterly CMS updates on NCCI page.
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