835 Denial Combination
CO-97+M15
Contractual Obligation · Service-Line Level Adjustment
Coding ErrorWhat This Combination Means
This combination indicates the payer has bundled multiple separately-billed services into a single payment according to established coding rules. The adjusted service was already compensated within another procedure's payment, and the provider must contractually accept the bundled rate rather than separate reimbursement for each component.
Financial Responsibility
provider writeoff
The provider is contractually obligated to write off the adjusted amount since bundling is part of the fee schedule agreement. The patient cannot be billed for this contractual adjustment.
N/A
Appeal Success
Immediate (write-off)
Avg. Resolution
Easy
Difficulty
No
Appealable
Step-by-Step Resolution
Steps tailored specifically to this CO-97+M15 combination — not generic advice.
- 1
Verify which primary procedure received payment and which component services were bundled
Check the ERA loop 2110 Service Payment Information REF segment to identify the primary paid service and confirm the bundling logic applied
- 2
Post the contractual adjustment as a write-off in your practice management system
Apply the CO-97 adjustment to the bundled line item and zero out the balance since this is a non-billable contractual obligation
- 3
Update charge entry workflows to prevent future bundling denials
Educate billing staff on NCCI edits and payer-specific bundling rules to bill only the primary comprehensive code when components are performed together
Specialty Context
How CO-97+M15 typically presents across different practice types.
Dental
Common when separately billing prophylaxis components (scaling, polishing) that should be billed as a single preventive service code, or when billing individual radiograph codes that bundle into a full mouth series.
Medical
Frequently occurs with surgical procedures where incision, closure, and anesthesia are billed separately but bundle into the primary surgical CPT code, or when laboratory panels are billed as individual tests rather than the comprehensive panel code.
Behavioral Health
May apply when billing individual psychotherapy and evaluation/management codes on the same date of service that bundle under specific CPT guidelines, or when crisis intervention components are billed separately instead of using the comprehensive crisis code.
Individual Code References
View the standalone definition for each code in this combination.
Medicare Contractor Guidance for CARC 97
FCSO + NoridianThere are a few scenarios that exist for denial reason code CO 97. Please review the associated remittance advice remark code (RARC) noted on the remittance advice for your claim and then refer to the specific resources and tips to prevent the denial.
How to Prevent CARC 97 Denials
- ✓
RARC M15 (Bundled services): If the procedure code has a 'b' status on the Medicare Physician Fee Schedule (MPFS) database, the service should not be billed to Medicare. Check your most frequently billed procedure codes on the First Coast fee schedule lookup tool — if status is 'b', do not bill Medicare.
- ✓
RARC M144 (Pre/post-operative care): If billing for split care, coordinate split-care billing activities with other provider(s) involved in the patient's care, and ensure the surgical code is billed before the services for post-operative care are billed.
- ✓
RARC N70 (Consolidated billing): Before providing services to a Medicare beneficiary, determine if a home health episode exists. Ask the beneficiary if they are receiving home health services under a home health plan of care. Always check beneficiary eligibility prior to submitting your claim via SPOT.
Need to resolve this denial?
Get a complete resolution plan with appeal guidance for this exact combination in seconds.
Generate a free resolution plan & appeal letter →Synthesized from official definitions — not from training data