HCPCS Code G0513: Complete Medicare Billing Guide for 2026

HCPCS Code G0513 is a Medicare-defined HCPCS Level II add-on code used to report the first 30 minutes of prolonged preventive services beyond the typical duration of a qualifying visit.

G0513 allows providers to bill for additional face-to-face time during preventive services when a visit exceeds CMS-defined time thresholds. This ensures more accurate reimbursement for extended care, particularly during services such as Annual Wellness Visits (AWV).

G0513 applies only in office or outpatient settings and requires direct patient contact by the billing provider.

G0513 was introduced by the Centers for Medicare & Medicaid Services (CMS) in the 2018 Medicare Physician Fee Schedule to address a long-standing gap where extended preventive visit time could not be billed separately. It remains active and payable under the 2026 fee schedule.

This guide breaks down how to bill G0513 in 2026, including eligibility, time requirements, documentation rules, reimbursement, and common mistakes, so you can avoid denials and capture the full value of prolonged preventive care.

Who Can Bill G0513?

Only the provider who personally performs and bills the primary preventive service can bill G0513. The following providers qualify:

• Physicians (MDs and DOs) who personally deliver the base preventive service and the prolonged face-to-face time
• Nurse Practitioners (NPs) who independently bill Medicare preventive services and personally spend the additional time
• Physician Assistants (PAs) with billing authority for the base preventive service under Medicare rules
• Clinical Nurse Specialists (CNSs) who independently perform and bill qualifying preventive visits

The rule is straightforward but strict. The same individual who bills the base preventive code must also be the person who spent the additional face-to-face time with the patient. A physician cannot step out, have a nurse practitioner finish the visit, and then add G0513 to the physician’s claim. The billing provider and the provider who delivered the prolonged time must be the same person.

The key requirement across all provider types is an independent billing authority for the base preventive service under Medicare. If a practitioner can bill the qualifying preventive code on their own, they can also bill G0513 when the visit runs long, and they personally deliver the extra time.

According to Noridian Medicare (a Medicare Administrative Contractor), the additional time may only be spent by the provider performing and billing the preventive service. This guidance applies across all MAC jurisdictions, though practices should confirm any local variations with their specific contractor.

Who Cannot Bill G0513?

Clinical staff and auxiliary personnel cannot bill G0513 under any arrangement. The following are explicitly excluded:

• Registered Nurses (RNs) and Licensed Practical Nurses (LPNs), even when providing direct patient education during the visit
• Medical Assistants (MAs), regardless of how much face-to-face time they spend with the patient
• Health Coaches and Care Coordinators, including those who conduct portions of Annual Wellness Visits (AWV)
• Any staff billing under “incident to” rules, since G0513 is not subject to incident-to billing
• Any provider who did not personally perform the base preventive service on the same claim

G0513 does not allow “incident to” billing. The same provider must personally deliver all prolonged times.

It also cannot be billed if:

• No qualifying preventive service is on the same claim
• The visit is outside an office or outpatient setting
• Direct patient contact is not documented

Even one of these conditions makes the code ineligible. Always confirm with your MAC for any local requirements.

When Should You Bill G0513?

Bill G0513, when three conditions are met at the same time:

• The base service is a Medicare-covered preventive service
• The visit exceeds the CMS-defined typical time by at least 16 minutes of direct face-to-face contact
• The service is performed in an office or outpatient setting (POS 11 or equivalent)

Only face-to-face time with the patient counts. Chart review, writing notes after the patient leaves, phone calls, and care coordination done without the patient in the room do not qualify. The billing provider must personally spend the additional time. “Incident to” billing rules do not apply to G0513.

Which Primary Codes Qualify for G0513?

G0513 pairs only with specific Medicare-covered preventive service codes. Pairing it with a non-qualifying code results in automatic denial.

Additional qualifying codes include G0296 (lung cancer screening counseling), G0442 (alcohol misuse screening), and G0444 (depression screening). CMS publishes the full qualifying list in its supporting document titled “List of Preventive Services Billed With Prolonged Preventive Codes.”

The most frequently billed combination across Medicare claims is G0439 (subsequent AWV) paired with G0513. This makes sense because the subsequent AWV is the most common recurring preventive visit in Medicare, and complex patients often push these visits past the 30-minute typical time.

How Do G0513 and G0514 Work Together?

G0513 covers the first 30-minute block of prolonged preventive time, while G0514 covers each additional 30-minute block after that. You cannot bill G0514 without G0513 on the same claim.

The billing sequence follows a strict order: qualifying preventive service code first, then G0513, then G0514 if the visit ran long enough. Breaking this sequence triggers denials.

CMS uses the midpoint rule to decide when G0513 becomes reportable. The provider must reach at least 16 minutes of prolonged time before billing G0513. That 16-minute threshold equals the midpoint of the first 30-minute block plus one minute.

Here is how time thresholds work, using a base service with 30 minutes of typical time:

A detail many billing teams overlook: the midpoint threshold shifts depending on the base code’s typical time. A base service with a 45-minute typical time produces a different prolonged time calculation than one with a 30-minute typical time. Always calculate from the specific base code’s CMS-assigned duration.

What Is the Reimbursement Rate For G0513 in 2026?

Medicare reimburses G0513 through the Physician Fee Schedule using RVUs multiplied by the conversion factor and geographic adjustments.

For CY 2026, CMS applies two separate conversion factors for the first time:

• Non-qualifying APM practitioners: $33.40 (a 3.26% increase from 2025)
• Qualifying APM participants: $33.57 (a 3.77% increase from 2025)

These increases reflect the 2.5% temporary pay bump under the One Big Beautiful Bill Act, MACRA-required permanent updates, and a positive 0.49% budget neutrality adjustment.

Here is a detail that directly affects G0513 reimbursement: the 2.5% efficiency adjustment CMS finalized for 2026 applies only to non-time-based services. G0513 is a time-based add-on code. It is exempt from this reduction. Many practices assume the cut applies across the board, but it does not touch G0513. Verify your locality-specific rate using the CMS Physician Fee Schedule Look-Up Tool.

Patients owe nothing out of pocket for G0513 under Original Medicare. Because G0513 extends preventive services already exempt from the Medicare deductible and coinsurance, the prolonged time code carries the same exemption. Medicare Advantage plans may apply different billing rules, so always verify with the specific carrier.

Which ICD-10 Codes Support G0513?

G0513 inherits its medical necessity from the base preventive code. You do not need a separate diagnosis to justify the prolonged time.

Common supporting diagnoses include:

• Z00.00 or Z00.01 for general exam encounters tied to AWV or IPPE
• Z12.11 for colon cancer screening
• Z12.4 for cervical cancer screening
• Z12.5 for prostate cancer screening

Using symptom-based primary diagnoses creates problems. For example, listing R10.9 (unspecified abdominal pain) as the primary diagnosis conflicts with the preventive intent of the visit. This mismatch triggers denials because the claim no longer reads as a preventive service.

What Documentation Does G0513 Require?

The medical record must contain five elements: 

• Total face-to-face time (in minutes)
• A clear statement that the time exceeded the base code’s typical time
• The clinical reason for the prolonged service
• Identification of the specific preventive service performed
• The billing provider’s name

Accepted documentation methods:

Providers can document time in two accepted ways.

Common Mistakes Doctors’ Offices Make With G0513

G0513 claim denials often come down to simple but overlooked billing errors. This section breaks down the most common mistakes, including missing base preventive codes, incorrect modifiers, and weak documentation, so you can identify issues quickly and prevent avoidable denials.

• Billing G0513 without a qualifying base preventive code: This is the most common reason for denial. G0513 must always be billed with an approved preventive service on the same claim.
• Base preventive code denied first: If the primary preventive code is rejected (for example, due to coverage issues), G0513 becomes invalid and gets denied as well.
• Screening turns diagnostic during the procedure: When a screening colonoscopy converts to diagnostic, G0513 is no longer eligible, but it is sometimes not removed.
• Incorrect modifier on the base code: A wrong modifier can cause Medicare to process the service as non-preventive, which disqualifies G0513.
• Weak or vague time documentation: Statements like “visit was longer than usual” are not acceptable. Clear total face-to-face time is required.
• Billing G0514 without G0513:  G0514 is an add-on code and cannot be billed alone.
• Wrong place of service: G0513 is only valid in office and outpatient settings. It is not allowed in inpatient or facility settings where overhead is billed separately. 

Final Words

HCPCS code G0513 remains a valuable code for reporting prolonged preventive services when Medicare visits exceed typical time limits.  Many G0513 claim denials stem from simple errors, such as missing base codes or insufficient time documentation. By focusing on accurate reporting, proper documentation, and compliance with Medicare Physician Fee Schedule guidelines, providers can maximize reimbursement without increasing audit risk.