Quick Explanation
Denial code CO-102 (Major Medical Adjustment) occurs when a claim's payment is adjusted because the services rendered fall under the patient's major medical insurance policy rather than their standard basic health coverage. This shift often involves the application of a major medical deductible, coinsurance limits, or a transition of liability to a secondary payer under coordination of benefits (COB) rules.
Common Causes for CO-102
Denials with code CO-102 typically happen for the following specific reasons:
- The patient's basic coverage limits have been exhausted, causing the claim to transition to and be adjusted under major medical benefit rules.
- Improper sequencing or failure to update coordination of benefits (COB) information between basic health plans and major medical policies.
- The billed services are specifically carved out of standard health benefits and are subject to the deductible and coinsurance of a major medical rider.
- Incorrect billing of a secondary or supplemental policy as the primary payer, triggering a major medical adjustment.
How to Prevent CO-102 Denials
To avoid receiving this denial in the future, implement these specific checks:
- Perform comprehensive real-time eligibility (RTE) checks prior to service to identify the active primary, basic, and major medical insurance hierarchies.
- Obtain updated coordination of benefits (COB) information from the patient at least annually or whenever policy changes occur.
- Map payer-specific contracts in the practice management system to accurately route services covered under major medical riders versus basic plans.
- Submit the primary Explanation of Benefits (EOB) clearly showing basic benefit exhaustion when billing the major medical plan for remaining balances.
Appeal Letter Template for CO-102
If you believe this claim was denied incorrectly, you can use the following template to submit an appeal.
[Your Practice Header]
[Date]
[Payer Name]
[Appeals Department Address]
RE: Appeal for Claim [Claim Number]
Patient: [Patient Name]
ID: [Patient ID]
Date of Service: [Date]
Denial Code: CO-102 - Major Medical Adjustment
Dear Appeals Department,
I am writing to appeal the denial of the above-referenced claim, which was denied with code CO-102: "Major Medical Adjustment".
We are writing to formally appeal the adjustment applied under denial code CO-102 on claim [Claim Number] for services rendered on [Date of Service]. The medical documentation enclosed confirms that the services provided were medically necessary and comply fully with CMS guidelines and American Medical Association (AMA) billing regulations. The patient's basic coverage was correctly exhausted, and the claim was subsequently submitted to the major medical policy in accordance with standard coordination of benefits (COB) protocols. We request that you review the attached primary EOB and clinical chart notes, reverse the major medical adjustment, and adjudicate this claim for full payment under the appropriate major medical policy benefits.
Attached please find:
1. A copy of the original claim.
2. The relevant medical records supporting the service.
3. [Any other supporting documents].
We respectfully request that you reprocess this claim for payment.
Sincerely,
[Your Name]
[Title]
[Practice Name]
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