CO-101: Predetermination: Anticipated Payment

What Does CO-101 Mean?

CO-101 is the standard group code pairing for predetermination responses. The CO designation here does not mean the provider owes money — it simply means the anticipated adjustment is a contractual calculation based on the plan's benefit structure. The adjustment amount shows the difference between the submitted charges and the payer's anticipated allowed amount under the contract terms.

When CARC 101 appears, the payer is responding to a predetermination or pre-estimate request rather than processing a final claim. A predetermination is a prospective review where the payer evaluates the proposed service and provides an anticipated payment amount before the service is delivered. This gives the provider and patient advance visibility into what the payer is expected to cover.

CARC 101 is fundamentally different from a denial. No service has been rendered, no claim has been adjudicated, and no payment has been finalized. The payer is simply communicating: this is what we anticipate paying when you submit the actual claim. The predetermination amount is not a guarantee of payment — it is an estimate based on the patient's current eligibility, benefit structure, and the information provided in the predetermination request.

Predeterminations are most commonly used for high-cost procedures, dental services, and elective surgeries where advance cost information helps patients make informed decisions about their care. Some payers require predetermination for certain service categories before they will authorize the procedure. If the predetermination response is lower than expected or if the payer requests additional information, the provider should address those concerns before proceeding with the service to avoid payment surprises at the claim stage.

Common Causes

How to Resolve

Review the predetermination response, satisfy any outstanding requirements, and submit the actual claim with the predetermination reference number once services are rendered.

1. Validate the anticipated allowed amount Cross-reference the predetermination's anticipated allowed amount against your contracted fee schedule to ensure the payer's estimate aligns with your contract terms.
2. Address any payer concerns If the predetermination response indicates additional information is needed or the anticipated payment is lower than expected, contact the payer for clarification before rendering services.
3. File the actual claim upon service completion After delivering the service, submit the final claim referencing the predetermination number. The payer will adjudicate the claim based on the patient's eligibility at the time of service.
4. Request peer-to-peer if predetermination is unsatisfactory If the predetermination amount is significantly below expectations, request a peer-to-peer review with the payer's medical director to present additional clinical justification.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-101:

How to Prevent CO-101

• Submit complete predetermination requests with all required patient demographics, diagnosis codes, procedure codes, and clinical documentation
• Verify each payer's specific predetermination requirements before submitting requests
• Track predetermination submissions and follow up on pending requests to avoid delays
• Include the predetermination approval number on all subsequent actual claims to prevent processing delays

General Prevention

• Submit complete and accurate predetermination requests with all required patient demographics, diagnosis codes, procedure codes, and clinical documentation
• Verify the payer's specific predetermination requirements before submitting the request, as requirements vary by payer and service type
• Track predetermination submissions and follow up promptly on pending requests to avoid delays in service delivery
• Maintain a database of payer-specific predetermination requirements and update it regularly as payer policies change
• Train staff on the difference between predetermination requests and actual claims to ensure the correct submission type is used
• Include the predetermination approval number on all subsequent claims to prevent processing delays

Also Filed As

The same CARC 101 may appear with different Group Codes:

Related Denial Codes