OA-102: Major Medical Adjustment

What Does OA-102 Mean?

OA-102 appears in coordination of benefits situations where the major medical adjustment from the primary payer does not assign clear responsibility. The balance may need to be submitted to a secondary payer for further adjudication under their benefit structure.

CARC 102 surfaces when the payer adjudicates your claim under the major medical benefit tier of the patient's plan and applies an adjustment based on that tier's specific coverage rules. Many insurance plans divide benefits into tiers — basic and major medical — with different deductibles, coinsurance rates, and coverage limits for each. When a service falls under the major medical tier, the financial rules can differ significantly from basic benefits.

This code is particularly relevant for plans that maintain separate deductible and out-of-pocket accumulations for major medical services. A patient might have a fully satisfied basic deductible but still have an unmet major medical deductible, causing charges to be applied differently depending on the benefit category. The payer uses CARC 102 to signal that the adjustment is specifically a major medical benefit calculation, not a standard fee schedule reduction or coverage denial.

From a billing perspective, the first step is always to verify that the service was correctly categorized. Coding errors can cause a service to be adjudicated under the wrong benefit tier — for example, a procedure that should fall under basic benefits might be classified as major medical due to an incorrect CPT code or missing modifier. If the categorization is correct, the adjustment is a legitimate application of the plan's benefit structure, and your response depends on the group code: write off the CO portion and collect the PR portion from the patient.

How to Resolve

Verify the service was categorized under the correct benefit tier, then post the contractual adjustment and bill the patient for their major medical cost-sharing.

1. Submit to the secondary payer File the claim with the secondary payer including the primary ERA showing the OA-102 adjustment. The secondary plan will apply their own benefit tier rules.
2. Process the secondary response Post adjustments based on the secondary payer's ERA. Any remaining balance after all payers adjudicate becomes the patient's responsibility.

Common RARC Pairings

The RARC code tells you exactly what triggered the OA-102:

How to Prevent OA-102

• Collect complete insurance information for all payers at registration to ensure proper COB sequencing
• Verify major medical benefit structures with both primary and secondary payers before rendering high-cost services

General Prevention

• Verify the patient's benefit structure before rendering services, paying attention to whether the service falls under basic or major medical benefits
• Obtain prior authorization for services that fall under the major medical benefit tier when required by the payer
• Use accurate procedure and diagnosis codes to ensure claims are adjudicated under the correct benefit category
• Check the patient's remaining major medical benefits and maximums before scheduling services
• Educate patients about their major medical benefit structure, including deductibles, coinsurance, and maximums, before services are rendered
• Monitor claim remittances for patterns of major medical adjustments to identify systemic coding or billing issues

Also Filed As

The same CARC 102 may appear with different Group Codes:

Related Denial Codes