CO-95: Plan Procedures Not Followed

What Does CO-95 Mean?

CO-95 places the financial burden on the provider. The payer is saying your practice failed to follow a required plan procedure — typically by not obtaining prior authorization or by rendering a service that required a referral without one on file. Under your contract, you agreed to follow these procedures, and the payer is holding you to that commitment. You cannot bill the patient for CO-95 denials.

When CARC 95 appears on a remittance, the payer is telling you that someone — either the provider or the patient — did not follow a required procedural step outlined in the insurance plan before the service was delivered. This is one of the most preventable denial codes in medical billing because it almost always traces back to a verification gap in the pre-service workflow.

The most frequent trigger is a missing prior authorization. The payer required pre-approval for the service, and the authorization was not obtained before care was rendered. Missing referrals are the second most common cause, particularly for plans that require a primary care physician referral before the patient can see a specialist. Non-compliance with step therapy protocols, where the payer requires the patient to try lower-cost treatments before more expensive ones, is another trigger.

The group code paired with CARC 95 determines the financial impact. CO-95 places the responsibility on the provider — you rendered the service without following the required plan procedure, and your contract holds you liable. PR-95 places it on the patient — they sought care without obtaining their plan's required referral or following other member-side procedures. In both cases, the accompanying RARC code will specify exactly which plan procedure was not followed, so always read the remark code before deciding on your resolution strategy.

Common Causes

How to Resolve

Identify the specific plan procedure that was missed, attempt to satisfy it retroactively, and either resubmit or appeal with supporting documentation.

1. Identify the missed procedure Review the RARC to determine whether the issue is a missing prior authorization, referral, step therapy requirement, or other plan procedure.
2. Request retroactive authorization Contact the payer's utilization management department and request retroactive authorization. Provide clinical documentation, medical records, and a clinical rationale supporting the necessity of the service.
3. Resubmit with authorization Once retroactive authorization is granted, resubmit the claim with the authorization number. If denied retroactively, proceed to formal appeal.
4. File a formal appeal Submit a written appeal with the medical record, clinical documentation, and a letter explaining why the plan procedure was not followed and why the service was medically necessary.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-95:

How to Prevent CO-95

• Verify prior authorization requirements for every service before rendering care using real-time eligibility and benefits tools
• Maintain a payer-specific authorization database organized by procedure code and update it as payer policies change
• Implement automated authorization tracking that alerts staff when an authorization is pending, expired, or not yet obtained
• Train scheduling and front desk staff to verify authorization status at every scheduling, confirmation, and check-in touchpoint

General Prevention

• Verify prior authorization requirements for every service before rendering care using real-time eligibility and benefits verification tools
• Maintain a reference database of payer-specific authorization requirements organized by procedure code and plan type
• Implement automated prior authorization tracking that flags pending or expired authorizations before the date of service
• Train front desk and scheduling staff to check authorization status at scheduling, confirmation, and check-in touchpoints
• Establish a process for obtaining retroactive authorization within payer-allowed timeframes when emergent services are rendered
• Conduct regular audits of denied claims with CARC 95 to identify patterns in missed authorizations or referrals

Also Filed As

The same CARC 95 may appear with different Group Codes:

Related Denial Codes