Medical claim denials are frustrating, especially when the services provided were medically necessary and properly documented. In many cases, the issue isn’t the treatment itself but how the claim is interpreted by the insurance payer. One common example is the CO-97 Denial Code, which often occurs when a payer determines that a billed service is already included in the payment for another procedure.

Understanding why this denial occurs is essential for every healthcare provider and medical billing team. Instead of submitting unnecessary appeals or repeatedly correcting claims, identifying the root cause can help reduce payment delays and improve billing accuracy. In this guide, we’ll explain the CO-97 Denial Code in simple terms, explore its common causes, discuss practical solutions, and share proven strategies to help prevent similar denials in the future.

What Is the CO-97 Denial Code?

The CO-97 Denial Code means:

“The benefit for this service is included in the payment/allowance for another service or procedure that has already been adjudicated.”

Simply put, the insurance payer believes the denied service should not be paid separately because it is already included in the reimbursement for another procedure. This process is commonly known as bundling.

Receiving a CO-97 denial does not necessarily mean the provider made a billing mistake. In many situations, the service was performed correctly, but the payer’s reimbursement policy considers it part of another payable procedure.

Understanding Bundled Services in Medical Billing

Before resolving a CO-97 denial, it’s important to understand how bundling works.

Insurance companies often combine related medical services into a single payment instead of reimbursing each service separately. This approach helps standardize payments and reduce duplicate reimbursements for procedures that are routinely performed together.

For example, if a physician performs a surgical procedure that normally includes certain pre-operative or post-operative services, those related services may already be included in the primary procedure’s payment. Billing them separately without appropriate documentation or modifiers can result in a CO-97 denial.

Why Does the CO-97 Denial Code Occur?

Several billing situations can trigger a CO-97 denial.

Bundled Services

Some medical procedures automatically include related services under one payment. If both services are billed separately, the payer may deny the additional service because it is already included in the primary procedure.

Incorrect Modifier Usage

Modifiers such as Modifier 25, Modifier 59, XE, XS, XP, and XU help identify services that should be reimbursed separately.

If a required modifier is missing or used incorrectly, the payer may bundle the services and deny payment.

Duplicate Billing

Submitting the same procedure multiple times or billing overlapping services may cause the payer to classify one of the claims as bundled.

Coding Errors

Incorrect CPT or HCPCS coding can unintentionally group services together under payer bundling rules.

Accurate coding helps reduce these denials.

Payer-Specific Billing Policies

Every insurance company follows its own reimbursement guidelines.

A service that is separately payable under one payer may be bundled under another payer’s policy.

Reviewing payer-specific billing requirements before claim submission helps improve payment accuracy.

Common Billing Mistakes That Trigger CO-97

Many CO-97 denials occur because of preventable billing errors.

Some of the most common mistakes include:

Billing an Evaluation and Management (E/M) service without the appropriate modifier.
Submitting procedures that are already included in a global surgical package.
Reporting laboratory or diagnostic services separately when they are considered part of another procedure.
Using outdated CPT or HCPCS codes.
Failing to review National Correct Coding Initiative (NCCI) edits before claim submission.
Ignoring payer-specific reimbursement guidelines.

Regular claim reviews can identify these issues before they lead to denials.

Practical Example of a CO-97 Denial

A patient visits a physician for an office evaluation and also undergoes a minor procedure during the same appointment. The billing team submits claims for both services without appending the appropriate modifier to indicate that the evaluation was significant and separately identifiable.

The insurance payer processes the claim and determines that the office visit is included in the payment for the procedure. As a result, the office visit receives a CO-97 Denial Code.

After reviewing the physician’s documentation, the billing team confirms that the evaluation addressed a separate medical concern unrelated to the procedure. The claim is corrected with the appropriate modifier and supporting documentation before being resubmitted. Once reviewed, the payer approves the corrected claim.

This example highlights the importance of accurate coding, proper modifier usage, and detailed documentation.

CO-97 Denial Prevention Checklist

Reducing CO-97 denials starts with a proactive billing process.

Before submitting a claim, confirm that you have completed the following:

✔ Review CPT and HCPCS codes for accuracy.

✔ Check National Correct Coding Initiative (NCCI) edits.

✔ Verify whether the procedure is part of a bundled service.

✔ Confirm that all required modifiers are supported by documentation.

✔ Review payer-specific billing guidelines.

✔ Ensure physician documentation clearly supports separately billable services.

✔ Perform a final claim quality review before submission.

Following this checklist can significantly reduce preventable denials and improve first-pass claim acceptance.

How RobustInc Helps Resolve CO-97 Denials

At RobustInc, we understand that every denied claim represents delayed revenue and additional administrative work. Our experienced medical billing specialists carefully analyze the root cause of each denial instead of simply resubmitting claims.

We review coding accuracy, evaluate payer-specific bundling policies, verify modifier usage, and ensure supporting documentation is complete before preparing corrected claims or appeals. This structured approach helps healthcare providers improve claim accuracy, reduce recurring denials, and strengthen their overall revenue cycle management.

Our medical billing services include:

Medical Billing Services
Medical Coding Services
Revenue Cycle Management (RCM)
Denial Management
Claims Submission
Claims Follow-Up
Appeals Management
Insurance Eligibility Verification
Payment Posting
Accounts Receivable (AR) Management
Prior Authorization Support
Medical Billing Virtual Assistant Services