CO 95 denial code

Claim adjustment reason code 95. Often reported as CO 95 or PR 95.

Plan procedures not followed

Unofficial reference. This is our own plain-English explanation, not the official code text. Payer rules differ. Verify with the payer and the official X12 code list. AlphaPrefix is not affiliated with X12, CMS or any payer. Data last updated Nov 11, 2026.

What 95 means

The claim was reduced or denied because a step the member's plan requires was not completed.

The payer is saying a plan rule was skipped, without pointing to one of the more specific codes. Examples are a required referral, notification, specific network use or other administrative step written into the plan.

Because the code is broad, the remark codes and any policy reference on the 835 matter. Read them to learn which rule the payer applied before you decide how to respond.

Group codes seen with 95

On a remittance, 95 comes after a group code. These are the ones it is most often reported with:

• CO 95 (Contractual Obligation): The provider's side of the ledger. The reduction comes from the payer contract or a rule the provider has to follow, and the patient normally cannot be billed for it.
• PR 95 (Patient Responsibility): The amount is assigned to the patient. Deductibles, coinsurance and copays are the everyday examples. Whether you can collect it still depends on your contract and the patient's plan.

The payer chooses the group code for each adjustment, so the same reason code can appear with another group code on your remittance. Read the two together. More about group codes.

Common causes

• A required referral or notification was not on file for the service.
• The member used a service channel the plan does not allow, such as an out-of-network lab.
• The provider did not follow a plan rule on how a service must be ordered or delivered.

What to do next

1. Read the remark codes and policy reference on the remittance to identify the rule involved.
2. Check the member's plan documents and your contract for that requirement.
3. Send the missing referral or notification proof with a reconsideration if the step was in fact completed.
4. Note the group code before moving any amount to the patient.

Related codes

• 197 (reason code) No prior authorization on file
• 272 (reason code) Coverage or program guidelines not met