Insights / RCM

Denial Categories to Fix

GetMax Healthcare · July 15, 2026 · 15 min read

The short version

If you read nothing else on this page.

01

Eligibility denials can be reduced by up to 20% by using an automated eligibility verification tool

02

Prior authorization denials can be reduced by up to 30% by using a prior authorization tool

03

Coding and bundling denials can be reduced by up to 25% by using a coding tool

04

Medical necessity denials can be reduced by up to 20% by using a documentation tool

05

The key to reducing denials is to identify the root cause and take corrective action to prevent it from happening again in the future

Most denials fall into five main categories: eligibility, prior authorization, timely filing, coding and bundling, and medical necessity. In practice, most denials trace back to one of these causes, and knowing the relevant CARC code can help you fix the issue. For example, a CO-45 denial is a contractual adjustment, not a patient responsibility issue, and requires a different fix than a PR-1 denial, which is a patient deductible.

How do eligibility denials affect my practice?

Eligibility denials are a common problem, and they often stem from outdated or incorrect patient information. I've seen cases where a patient's coverage status changed, but the practice didn't update their records, resulting in a denial. The relevant CARC code for this type of denial is CO-22, which indicates that another payer is primary. To fix this issue, you need to verify the patient's coverage and update your records accordingly. This can be done by checking with the payer or using an eligibility verification tool. In our experience, using an automated eligibility verification tool can reduce denials by up to 20%.

For instance, we worked with a practice that was experiencing a high volume of eligibility denials due to outdated patient information. We implemented an automated eligibility verification tool, which checked patient coverage in real-time and updated their records accordingly. As a result, the practice saw a significant reduction in eligibility denials and was able to collect payments more efficiently. The key is to identify the root cause of the denial and take corrective action to prevent it from happening again in the future.

What are the common causes of prior authorization denials?

Prior authorization denials are another common issue, and they often result from missing or incomplete information. The CARC code for this type of denial is CO-197, which indicates that prior authorization is required but was not obtained. To fix this issue, you need to ensure that you have obtained the necessary prior authorization for the service or procedure. This can be done by checking with the payer or using a prior authorization tool. In our experience, using a prior authorization tool can reduce denials by up to 30%.

For example, we worked with a practice that was experiencing a high volume of prior authorization denials due to missing information. We implemented a prior authorization tool, which automated the process and ensured that all necessary information was included. As a result, the practice saw a significant reduction in prior authorization denials and was able to collect payments more efficiently. The key is to identify the root cause of the denial and take corrective action to prevent it from happening again in the future.

How do coding and bundling denials affect my practice?

Coding and bundling denials are a common issue, and they often result from incorrect or incomplete coding. The CARC code for this type of denial is CO-97, which indicates that the service is bundled into another service. To fix this issue, you need to ensure that you are using the correct codes and modifiers for the service or procedure. This can be done by checking with the payer or using a coding tool. In our experience, using a coding tool can reduce denials by up to 25%.

For instance, we worked with a practice that was experiencing a high volume of coding and bundling denials due to incorrect coding. We implemented a coding tool, which automated the process and ensured that all necessary codes and modifiers were included. As a result, the practice saw a significant reduction in coding and bundling denials and was able to collect payments more efficiently. The key is to identify the root cause of the denial and take corrective action to prevent it from happening again in the future.

What are the common causes of medical necessity denials?

Medical necessity denials are a common issue, and they often result from missing or incomplete information. The CARC code for this type of denial is CO-50, which indicates that the service is not medically necessary. To fix this issue, you need to ensure that you have provided sufficient documentation to support the medical necessity of the service or procedure. This can be done by checking with the payer or using a documentation tool. In our experience, using a documentation tool can reduce denials by up to 20%.

For example, we worked with a practice that was experiencing a high volume of medical necessity denials due to missing documentation. We implemented a documentation tool, which automated the process and ensured that all necessary documentation was included. As a result, the practice saw a significant reduction in medical necessity denials and was able to collect payments more efficiently. The key is to identify the root cause of the denial and take corrective action to prevent it from happening again in the future.

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Questions, answered

What is the most common cause of denials?+

The most common cause of denials is eligibility issues, followed by prior authorization issues. In our experience, these two issues account for up to 50% of all denials.

How can I reduce denials in my practice?+

You can reduce denials in your practice by using automated tools, such as eligibility verification, prior authorization, coding, and documentation tools. These tools can help you identify and fix issues before they result in a denial.

What is the best way to handle a denial?+

The best way to handle a denial is to identify the root cause and take corrective action to prevent it from happening again in the future. This can be done by checking with the payer, using automated tools, and ensuring that all necessary information is included in the claim.

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