Insights / RCM

Locum Tenens Billing Guide

GetMax Healthcare · August 10, 2026 · 18 min read

The short version

If you read nothing else on this page.

01

The Q6 modifier is used to indicate that a service was provided by a locum tenens physician.

02

Billing under another NPI is necessary in certain scenarios, such as hospital or group practice settings.

03

Determining the correct NPI for locum tenens billing requires careful consideration of the billing scenario and the entity responsible for billing.

When it comes to locum tenens billing, understanding the Q6 modifier and its application is crucial for accurate reimbursement. The Q6 modifier is used to indicate that a service was provided by a locum tenens physician, and it can significantly impact the billing process. In general, locum tenens billing involves billing under the supervising physician's NPI, but there are scenarios where billing under another NPI is necessary.

How does the Q6 modifier affect locum tenens billing?

The Q6 modifier is a crucial component of locum tenens billing, as it helps payers identify services provided by a locum tenens physician. When a locum tenens physician provides a service, the Q6 modifier is appended to the procedure code to indicate that the service was provided by a substitute physician. For example, if a locum tenens physician provides a consultation service, the claim would include the Q6 modifier along with the relevant CPT code, such as 99243-Q6. It's essential to note that the Q6 modifier only applies to services provided by a locum tenens physician, and not to services provided by a permanent replacement physician.

In practice, the Q6 modifier can affect the reimbursement amount for locum tenens services. Payers may have specific policies regarding locum tenens billing, and the Q6 modifier helps ensure that services are reimbursed correctly. For instance, if a locum tenens physician provides a service that is typically reimbursed at a higher rate, the Q6 modifier may impact the reimbursement amount. It's crucial to understand the payer's policies and procedures regarding locum tenens billing to ensure accurate reimbursement.

The Q6 modifier is also subject to certain guidelines and regulations. According to the Centers for Medicare and Medicaid Services (CMS), the Q6 modifier is only applicable to services provided by a locum tenens physician who is substituting for a physician who is unavailable due to illness, injury, or other circumstances. The modifier is not applicable to services provided by a physician who is a permanent replacement for another physician.

What are the scenarios where billing under another NPI is necessary?

In general, locum tenens billing involves billing under the supervising physician's NPI. However, there are scenarios where billing under another NPI is necessary. For example, if a locum tenens physician is providing services in a hospital setting, the billing may need to be done under the hospital's NPI. This is because the hospital is responsible for billing for services provided in the hospital setting, and the locum tenens physician's services are considered part of the hospital's services.

Another scenario where billing under another NPI may be necessary is when a locum tenens physician is providing services in a group practice setting. In this case, the billing may need to be done under the group practice's NPI, rather than the individual physician's NPI. This is because the group practice is responsible for billing for services provided by its physicians, and the locum tenens physician's services are considered part of the group practice's services.

It's essential to note that billing under another NPI requires careful consideration and documentation. The locum tenens physician must ensure that they have the necessary permissions and agreements in place to bill under another NPI. This includes obtaining a written agreement from the supervising physician or the hospital, and ensuring that the billing is done in accordance with the relevant regulations and guidelines.

How do you determine the correct NPI for locum tenens billing?

Determining the correct NPI for locum tenens billing can be complex, and it requires careful consideration of the billing scenario. In general, the correct NPI is determined by the entity that is responsible for billing for the services provided. For example, if a locum tenens physician is providing services in a hospital setting, the hospital's NPI would be used for billing. If the locum tenens physician is providing services in a group practice setting, the group practice's NPI would be used for billing.

To determine the correct NPI, the locum tenens physician must consider the following factors: the type of service being provided, the setting in which the service is being provided, and the entity that is responsible for billing for the service. The locum tenens physician must also ensure that they have the necessary permissions and agreements in place to bill under the correct NPI. This includes obtaining a written agreement from the supervising physician or the hospital, and ensuring that the billing is done in accordance with the relevant regulations and guidelines.

In practice, determining the correct NPI for locum tenens billing requires careful attention to detail and a thorough understanding of the billing regulations and guidelines. The locum tenens physician must work closely with the billing staff and the supervising physician to ensure that the correct NPI is used for billing. This includes reviewing the billing scenario, determining the correct NPI, and ensuring that the billing is done in accordance with the relevant regulations and guidelines.

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Questions, answered

What is the purpose of the Q6 modifier?+

The Q6 modifier is used to indicate that a service was provided by a locum tenens physician, and it helps payers identify services provided by a substitute physician. The modifier is appended to the procedure code to indicate that the service was provided by a locum tenens physician.

Can a locum tenens physician bill under their own NPI?+

In general, a locum tenens physician cannot bill under their own NPI. The billing is typically done under the supervising physician's NPI or the hospital's NPI, depending on the billing scenario. However, there may be certain scenarios where a locum tenens physician can bill under their own NPI, such as when they are providing services as an independent contractor.

How do I determine the correct NPI for locum tenens billing?+

To determine the correct NPI for locum tenens billing, you must consider the type of service being provided, the setting in which the service is being provided, and the entity that is responsible for billing for the service. You must also ensure that you have the necessary permissions and agreements in place to bill under the correct NPI.

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