OA-183: Referring Provider Not Authorized to Refer

What Does OA-183 Mean?

OA-183 is less common and typically appears when the referral authorization issue does not fit neatly into the provider's contractual obligation. This may occur when the payer is still investigating the referring provider's eligibility or when the adjustment involves a coordination issue between the referring and rendering providers.

CARC 183 appears on your remittance when the payer determines that the referring provider listed on the claim does not have the authority to refer the patient for the specific service that was billed. This is not a question about whether the service itself was appropriate or covered — the payer is specifically rejecting the referral source.

The most common triggers are credential-related. The referring provider's medical license may have expired, their NPI may be inactive, or they may not be enrolled with the payer's network. In managed care plans that require referrals from primary care physicians, the referring provider may not be designated as the patient's PCP or may lack the specialty qualifications the payer requires for that particular referral type. Another frequent cause is simply data entry error — the wrong NPI was entered on the claim, or the referring provider's information does not match the payer's records.

This denial creates a workflow bottleneck because you cannot simply fix a code and resubmit — you need to first determine whether the referring provider is actually eligible, and if not, whether a new referral from a different provider is needed. If the referring provider is eligible but the payer's records are outdated, you may need to coordinate between the provider and the payer to update enrollment information before resubmitting.

How to Resolve

Verify the referring provider's eligibility status with the payer, correct any information errors, and resubmit with valid referral documentation.

1. Contact the payer for details Request clarification on why the OA designation was used and what specific information the payer needs to resolve the referring provider authorization issue.
2. Provide requested documentation Submit any credential documentation, referral forms, or enrollment verification the payer requests to resolve the adjustment.

How to Prevent OA-183

• Establish proactive communication with payers when referral authorization questions arise
• Document all payer correspondence about referring provider eligibility for future reference

Also Filed As

The same CARC 183 may appear with different Group Codes:

Related Denial Codes