G2004 Cpt code covers principal illness navigation services provided by a certified trainer or auxiliary personnel, the session lasts for 30 minutes. The code serves as an add-on code and billed after the base code which is G0023 (Includes first 60-minutes of the session).
This code aims to help Medicare patients smoothly deal with the serious conditions leading to the immediate hospitalization or sudden death.
What Is G0024?
The G0024 CPT code describes Principal Illness Navigation services for an additional 30 minutes per calendar month. CMS describes it as an add-on to G0023.
G0023 covers the first 60 minutes of PIN services during the calendar month. G0024 is then used for additional 30-minute increments when the patient receives more qualifying navigation services.
A simple example can make this easier to understand.
Imagine a patient needs help coordinating care for a serious condition. A trained patient navigator spends 60 minutes providing qualifying PIN services during the month. That time supports G0023.
Later, the navigator spends another 30 minutes providing qualifying navigation services. That additional time may support G0024 when all billing requirements are met. Therefore, G0024 is designed for additional time, rather than the initial 60-minute PIN service.
G0024 Service Description
The official description of the G0024 CPT code is:
Principal illness navigation services, additional 30 minutes per calendar month.
CMS also identifies G0024 as a PIN add-on code. Its role is to report additional navigation time after the primary PIN service.
PIN services can include activities such as:
- Helping patients understand their treatment plan
- Identifying barriers in providing care
- Connecting patients with community resources
- Supporting communication with the care team
- Helping patients build self-advocacy skills
- Supporting person-centered treatment goals
- Helping patients navigate healthcare services
The exact service must meet the applicable Medicare requirements. Documentation should show what was done and how the work relates to the patient’s serious or high-risk condition.
G0024 vs G0023
The main difference in G0024 CPT code and G0023 is the amount of qualifying service time they represent.
| Code | Service | Time |
| G0023 | Principal Illness Navigation | First 60 minutes/month |
| G0024 | Additional PIN service | Each additional 30 minutes/month |
CMS identifies G0023 as the primary PIN service and G0024 as its add-on.
PIN Add-On Billing
The G0024 CPT code is an add-on code. This means it is not generally intended to be reported by itself.
CMS explains that add-on codes describe services performed with a primary service. Type 1 add-on codes, for example, require an eligible primary procedure on the same claim when applicable.
For PIN, CMS identifies:
- G0023 as the primary PIN code
- G0024 as the additional-time PIN code
The CMS Federally Qualified Health Center guidance also lists G0023 under PIN services and G0024 as the related add-on code.
How Add-On Billing Works
A simple billing example:
A patient receives 60 minutes of qualifying PIN services in January. The navigator then provides another 60 minutes of qualifying PIN work during the same month.
The billing may include:
- G0023 for the first 60 minutes
- G0024 for the additional 30 minutes
- G0024 for another additional 30 minutes
The claim must still satisfy Medicare’s applicable coverage, documentation, practitioner, and billing requirements.
Billing teams should not assume that extra time automatically makes every additional unit payable. The service must qualify under the PIN requirements, and the claim should accurately reflect the work performed.
Principal Illness Navigation Additional Time
The key purpose of G0024 is Principal illness navigation additional time. G0023 provides the first 60 minutes of PIN services per calendar month. G0024 provides additional 30-minute increments. CMS lists the two codes together as PIN services.
For example, consider a patient receiving navigation support for a serious condition.
During the month:
- 60 minutes are spent on qualifying PIN activities.
- Another 30 minutes are spent coordinating care.
- Another 30 minutes are spent connecting the patient with needed resources.
The first 60 minutes may support G0023. Each additional qualifying 30-minute period may support G0024, subject to the applicable requirements.
The important point is that the time should represent qualifying navigation work. Simply contacting a patient does not automatically make the entire interaction billable.
Documentation should connect the activity to the patient’s navigation needs and the covered PIN service.
Who Can Provide PIN Services?
CMS established PIN services for certified or trained auxiliary personnel working under the direction of a physician or other practitioner. The service can include work performed by a patient navigator or certified peer specialist when applicable.
CMS later clarified that the term “certified or trained auxiliary personnel” can also include clinical social workers for these services.
The billing arrangement matters because not every person performing navigation work can automatically submit a claim independently.
Medical practices should confirm:
- The practitioner meets Medicare requirements.
- The auxiliary personnel meet applicable requirements.
- The services are performed under the required direction or supervision.
- The patient meets the applicable PIN criteria.
- The medical record supports the services.
- The reported time is accurate.
- The claim follows Medicare billing rules.
These checks can reduce avoidable denials.
G0024 Reimbursement
G0024 reimbursement can vary based on location, place of service, and Medicare payment factors. A national estimate should not be treated as the exact amount a provider will receive.
For 2026, one current fee-schedule source reports a national average Medicare estimate of about $54.44 for a non-facility setting and about $31.06 for a facility setting. These amounts are estimates and can vary by locality.
The actual allowed amount can be affected by geographic adjustments and other claim-specific factors. Providers should verify the applicable Medicare Physician Fee Schedule and their MAC guidance before using a rate for billing or financial planning.
This is especially important when publishing reimbursement information because Medicare rates can change.
Medical billing teams should therefore treat reimbursement figures as reference amounts rather than guaranteed revenue.
Documentation Requirements
Accurate documentation is essential when reporting G0024 CPT code services. The record should clearly support the navigation work performed. It should also show the time associated with the reported service.
Useful documentation can include:
- Patient’s serious or high-risk illness
- Navigation needs identified
- Date of service
- Navigation activities performed
- Resources or services discussed
- Care coordination activities
- Patient education or support provided
- Time spent on qualifying activities
- Patient response or progress
- Follow-up actions
- Connection to the patient’s treatment goals
For example, a note could explain that the navigator helped the patient understand a treatment plan, coordinated communication with the care team, and connected the patient with an appropriate community resource.
The note should not simply say “patient navigation completed.” More detail helps demonstrate what service was actually provided.
Accurate time tracking is also important because the code represents additional 30-minute service time.
Common Billing Mistakes
Several mistakes can create problems when billing PIN services.
- Billing G0024 Alone
- Because G0024 is an add-on code, billing it without the required primary PIN service can result in a denial. CMS identifies G0024 as an add-on to G0023.
- Reporting Unsupported Time
- The medical record should support the time reported. Extra units should not be added simply to increase reimbursement.
- Weak Documentation
- A short note that does not explain the navigation activities may not adequately support the claim.
- Ignoring Payer Rules
- Medicare rules should be reviewed along with applicable MAC guidance and payer-specific requirements.
- Using an Old Rate
- Reimbursement rates can change between years. A 2024 rate should not automatically be used for 2026 billing.
G0024 Billing Example
Suppose a practice has a patient who qualifies for PIN services.
The navigator provides 60 minutes of qualifying services during the month. The navigator then provides another 30 minutes later that month.
The billing structure may look like this:
G0023: First 60 minutes
G0024: Additional 30 minutes
If another qualifying 30 minutes is provided, another G0024 unit may be considered, provided all applicable requirements are met.
The claim should match the documentation. The medical record should support the services and time reported.
This example is only an illustration. Actual billing should follow current Medicare rules and payer guidance.
Final Takeaway
The G0024 CPT code is used for additional 30-minute Principal Illness Navigation services during a calendar month. It works with G0023 rather than replacing it.
For billing teams, the most important points are simple: verify patient eligibility, use the appropriate base and add-on codes, track qualifying time, maintain clear documentation, and check current Medicare payment rules.
CMS identifies G0023 and G0024 as PIN services, with G0024 serving as the additional-time code.
Because reimbursement can vary by locality and setting, providers should verify current rates before estimating revenue or submitting claims.
Frequently Asked Questions
Is G0024 a CPT code?
Technically, G0024 is a HCPCS Level II code, not a standard CPT code. CMS uses G codes for certain professional healthcare services that do not have a corresponding CPT-4 code.
Many billing resources still use the phrase “CPT code G0024” when discussing the code, but HCPCS is the more precise classification.
What does G0024 cover?
G0024 covers an additional 30 minutes of qualifying Principal Illness Navigation services during a calendar month. It is reported as an add-on to G0023.
Can G0024 be billed without G0023?
Generally, G0024 is an add-on service and is not intended to be billed as the primary PIN service. G0023 is the base PIN code, while G0024 reports additional time.
How much is G0024 reimbursement?
For 2026, a current national estimate is approximately $54.44 in a non-facility setting. Facility estimates can differ, and local Medicare rates may vary.
What is the difference between G0023 and G0024?
G0023 represents the first 60 minutes of PIN services per month. G0024 represents each additional 30 minutes of qualifying PIN services.
Who can provide PIN services?
PIN services can be provided by qualifying certified or trained auxiliary personnel under the direction of a physician or other practitioner, subject to Medicare requirements.