CO-148: Incomplete or Missing Information from Another Provider

What Does CO-148 Mean?

CO-148 is the standard pairing for this code. The CO group designation means the missing information is the provider's responsibility — the billing provider should have obtained and included the documentation from the other provider before submitting the claim. Under CO, the adjustment cannot be passed to the patient. The provider must obtain the missing documentation and resubmit.

CARC 148 appears on your remittance when the payer has determined that documentation from another healthcare provider — such as a referring physician, consulting specialist, or treating provider — was either not included with the claim or was incomplete. This is not a coverage denial or a medical necessity dispute. The payer is telling you that they cannot adjudicate the claim because they need information that should have come from a different provider involved in the patient's care.

The most common trigger is a missing referral letter or consultation report. When a patient is referred from one provider to another, the receiving provider is typically responsible for ensuring that the referring provider's documentation accompanies the claim. If that documentation is absent — whether because the referring provider never sent it, or it was lost in the handoff — the payer will return the claim with CARC 148. Other frequent causes include incomplete medical records from a collaborating provider, missing prior authorization documentation that the ordering provider obtained but did not share, and gaps in communication during the referral process.

From a workflow perspective, CARC 148 is a correctable denial. The claim itself is not being rejected on its merits — the payer simply needs more information to process it. Pay close attention to the accompanying RARC codes, which will specify exactly what information is missing. The fix is to obtain the missing documentation from the other provider, attach it to the claim, and resubmit.

Common Causes

How to Resolve

Identify what information from the other provider is missing, obtain it, and resubmit the claim with complete documentation.

1. Identify the missing documentation Review the RARC codes to determine exactly which information from the other provider is needed. Common items include referral letters, consultation reports, operative notes, and prior authorization documentation.
2. Obtain documentation from the other provider Contact the referring or treating provider and request the specific missing information. Be explicit about what the payer requires to avoid additional back-and-forth.
3. Resubmit with complete documentation Attach the obtained documentation to the claim and resubmit. Double-check that all required supporting documents are included before resubmission.
4. Implement workflow improvements Establish a documentation checklist for referral-based claims to ensure all required information from other providers is collected before the initial claim submission.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-148:

How to Prevent CO-148

• Create a standardized checklist for referral and consultation claims that verifies all required documentation from other providers is on hand before submission
• Implement EHR validation rules that flag claims missing required referral or consultation documentation before they are submitted
• Establish reliable communication channels with frequently referring providers to streamline document exchange
• Train billing staff to proactively request supporting documentation from other providers when scheduling referred patients

General Prevention

• Establish standardized inter-provider communication protocols to ensure all required documentation is shared before claims are submitted
• Implement EHR or practice management system validations that flag claims missing documentation from referring providers before submission
• Train billing staff to identify claims that require supporting documentation from another provider and to proactively request that documentation
• Conduct regular internal audits of claims that involve referrals or consultations to catch documentation gaps before submission
• Create a checklist for each referral or consultation-based claim to verify all required supporting documents from the other provider are included
• Maintain clear communication channels with frequently referring providers to streamline documentation sharing

Also Filed As

The same CARC 148 may appear with different Group Codes:

Related Denial Codes