Does CPT Code 93306 Need a Modifier? 2026 Billing Guide

Does CPT code 93306 need a modifier? Learn when to use modifiers 26, TC, 76, and 77, plus key 2026 billing rules to prevent claim denials.

Suleman

Jul 29, 2026 - 23:13

Does CPT Code 93306 Need a Modifier? 2026 Billing Guide

A missing modifier can delay payment. An unnecessary modifier can trigger an edit, reduce reimbursement, or make a valid echocardiogram claim look inconsistent.

So, does CPT code 93306 need a modifier?

CPT 93306 does not automatically require a modifier. Bill the code without a modifier when the same eligible entity provides both the technical performance and professional interpretation. Use modifier 26 for the professional component only and modifier TC for the technical component only.

That rule sounds simple, but hospital arrangements, outsourced interpretations, repeated studies, and same-day services create room for errors. Resilient MBS created this guide to help billing teams choose the modifier that matches the service actually furnished.

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What Does CPT Code 93306 Include?

CPT 93306 represents a complete transthoracic echocardiographic examination that includes two-dimensional imaging, M-mode when performed, spectral Doppler, and color flow Doppler.

The study typically evaluates cardiac chambers, ventricular function, valves, blood flow, and other relevant structures through ultrasound imaging performed across the chest wall.

CMS expects the medical record to contain a formal written interpretation, appropriate measurements, image documentation available for review, and qualitative and quantitative Doppler findings. The documentation must also support the clinical necessity of the service and explain repeat testing when applicable.

A modifier does not fix an incomplete report. Before reviewing modifier requirements, confirm that the documentation supports a complete study rather than a limited or follow-up examination.

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Does CPT Code 93306 Need Modifier 26 or TC?

The correct answer depends on who performed the technical component and who completed the professional interpretation.

Bill CPT 93306 Without a Modifier for the Global Service

Report 93306 without modifier 26 or TC when the same eligible physician, practice, or supplier entity furnished both:

The technical component
The professional interpretation and report

This is known as global billing.

For example, a cardiology practice owns the echocardiography equipment, employs or contracts the sonographer under an appropriate arrangement, performs the study in its office, and has its physician interpret the results. When the practice meets the applicable billing requirements for both components, it generally reports 93306 without a component modifier.

CMS explains that a global diagnostic service is billed without modifiers 26 and TC when the same physician or supplier entity furnishes both components within the applicable Medicare payment locality.

Use Modifier 26 for the Professional Component

Append modifier 26 when the billing provider performs only the professional component.

The professional component generally includes:

Reviewing the images and measurements
Interpreting the findings
Preparing the formal report
Signing and dating the interpretation

A common example occurs in a hospital outpatient department. The hospital supplies the equipment and sonographer, while an independent cardiologist interprets the study. The cardiologist generally reports:

93306-26

CMS requires separately billed professional interpretations of qualifying diagnostic tests to use modifier 26. CMS also instructs the interpreting provider to report the place of service associated with where the patient received the technical component, subject to its place-of-service rules.

Use Modifier TC for the Technical Component

Append modifier TC when the billing entity furnishes only the technical portion.

The technical component generally includes:

Echocardiography equipment
Sonographer or technical staff
Supplies
Image acquisition
Technical overhead
Storage of images and measurements

A diagnostic facility that performs the study but does not provide the physician interpretation may report:

93306-TC

CMS recognizes that diagnostic services can contain separate professional and technical components, which may be furnished in different settings or by different entities.

The professional and technical claims must not both be submitted as global services. That would make the claims appear duplicative and could result in denial or overpayment recovery.

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CPT 93306 Modifier Decision Tree

Use this sequence before releasing the claim:

Step 1: Did the same eligible entity furnish both components?

Yes: Bill 93306 without a component modifier.
No: Continue to Step 2.

Step 2: Is the claim only for the interpretation and report?

Yes: Bill 93306-26.
No: Continue to Step 3.

Step 3: Is the claim only for the equipment, staff, and image acquisition?

Yes: Bill 93306-TC.
No: Review the ownership, employment, reassignment, anti-markup, and payer-specific billing arrangement before submission.

Step 4: Was the complete study repeated on the same day?

Same physician or qualified professional: Consider modifier 76 on the repeated service.
Different physician or qualified professional: Consider modifier 77 on the repeated service.
Not a true repeat: Do not use a repeat modifier merely to bypass a duplicate-claim edit.

CMS directs providers to submit the first service without the repeat modifier and append modifier 76 or 77 to the subsequent same-day service when the circumstances support a genuine repeat procedure.

When Modifiers 76 and 77 May Apply

A repeat modifier may be appropriate when a second complete echocardiogram is medically necessary on the same date of service.

Modifier 76: Repeat Procedure by the Same Practitioner

Modifier 76 may apply when the same physician or qualified healthcare professional repeats the procedure after the original service.

A possible scenario is a significant, documented change in the patient’s clinical condition that requires another complete study later that day.

The record should explain:

Why the repeat examination was necessary
What changed after the first study
The time of each service
Whether the full examination was repeated
The findings from each study

Modifier 77: Repeat Procedure by Another Practitioner

Modifier 77 may apply when another physician or qualified healthcare professional repeats the procedure.

For example, a patient may undergo an echocardiogram at one facility and later require another medically necessary study by a different practitioner after transfer to another setting.

The second claim should not rely only on a different provider name. The record must show that a separate, medically necessary repeat service actually occurred.

CMS distinguishes modifiers 76 and 77 from modifier 91. Modifier 91 applies to repeat clinical diagnostic laboratory tests, not echocardiography procedures.

Does CPT Code 93306 Need Modifier 59?

Modifier 59 should not be appended routinely to CPT 93306.

CMS states that modifier 59 and the X modifiers should not be used merely to bypass an NCCI procedure-to-procedure edit. The documentation must establish a genuinely separate encounter, anatomical site, practitioner, structure, or non-overlapping service that meets the applicable requirements.

Modifier 59 also does not make separately billed Doppler components payable when they are already included in 93306.

Spectral Doppler and color flow Doppler are integral to CPT 93306. A Medicare Appeals Council decision confirmed that separately reporting the component Doppler codes with 93306 was not payable for the same examination, and modifier 59 did not establish a separate service in the reviewed circumstances.

Avoid these combinations for the same complete examination:

93306 plus separate spectral Doppler solely to represent the included Doppler work
93306 plus separate color flow Doppler solely to represent the included Doppler work
Modifier 59 added simply because another cardiovascular code appears on the claim
Modifier 59 added automatically by claim-scrubbing software

CMS updates NCCI procedure-to-procedure edits quarterly. Billing teams should review the current edit files rather than relying on a permanent internal list. The July 1, 2026 NCCI files were posted in June 2026.

Does a Same-Day Office Visit Change the 93306 Modifier?

A separately identifiable office or outpatient E/M service may require modifier 25 on the E/M code, not automatically on CPT 93306.

The clinical note must support work that is significant and separately identifiable from the usual activity associated with the diagnostic service. Do not add modifier 25 merely because an office visit and echocardiogram occurred on the same day.

CMS specifically states that modifier 59 should not be appended to an E/M service and directs providers to modifier 25 when a separate E/M service meets the requirements.

Payer edits vary, so confirm the individual plan’s same-day billing policy before submission.

Common CPT 93306 Modifier Errors

Billing teams should watch for these errors:

Billing the global service when the practice furnished only the interpretation
Using modifier 26 when the practice also furnished the technical component
Using modifier TC when the billing entity provided only the interpretation
Submitting global claims from both the facility and physician
Adding modifier 59 without a distinct-service basis
Using modifier 91 for a repeat echocardiogram
Adding modifier 76 or 77 without a true same-day repeat service
Failing to document why a repeat study was medically necessary
Reporting the wrong place of service on the professional claim
Using a modifier to compensate for an incomplete echocardiography report

Resilient MBS recommends making component ownership and interpretation responsibility required fields in the charge-entry workflow. That single control can prevent many 26, TC, and global-billing errors before claim submission.

Texas and Virginia Billing Considerations

Texas: Novitas Jurisdiction H

Traditional Medicare claims in Texas are processed under Novitas Jurisdiction H. Novitas maintains a specific TPE documentation checklist for CPT 93306, last modified June 5, 2026. The checklist is intended to help providers respond to additional documentation requests, although it does not replace CMS requirements.

Texas billing teams should verify:

Whether the claim is global, professional, or technical
Whether the ordering and interpreting provider information is correct
The place where the technical component occurred
Whether a Medicare Advantage or commercial plan applies different authorization rules
Whether supporting records can be produced promptly

Virginia: Palmetto GBA Jurisdiction M

Traditional Medicare claims in Virginia fall under Palmetto GBA Jurisdiction M.

Palmetto’s first-quarter 2026 prepayment review of CPT 93306 claims across Virginia, North Carolina, South Carolina, and West Virginia reported a 31% denial rate in the selected review cohort. Major issues included unsupported medical necessity, missing or incomplete records, signature deficiencies, and incorrect patient or service-date information. These findings describe the reviewed claims and should not be treated as a statewide denial rate.

The modifier may be correct and the claim may still fail if the documentation does not support the underlying service.

CPT 93306 Modifier Checklist for Clean Claims

Before submission, confirm:

Improve Echocardiogram Claim Accuracy

CPT 93306 does not need one universal modifier. It needs the modifier that truthfully describes who furnished the service and why the claim is being reported.

Resilient MBS helps cardiology practices review component billing, strengthen documentation controls, correct modifier errors, and track denial patterns before they affect revenue.

Use this guide as a pre-bill reference, then verify each claim against the patient’s payer, contract, place of service, and current coding policies.

Build cleaner echocardiogram claims with Resilient MBS compliance resources and cardiology billing support.

FAQs

Does CPT code 93306 always need a modifier?

No. Report CPT 93306 without a component modifier when the same eligible entity furnishes both the technical and professional components. Use modifier 26 or TC when those components are billed separately.

When should modifier 26 be used with CPT 93306?

Use modifier 26 when the billing provider reports only the interpretation and written report. This commonly occurs when a hospital or diagnostic facility furnishes the technical component.

When should modifier TC be used with CPT 93306?

Use modifier TC when the billing entity reports only the equipment, sonographer, supplies, image acquisition, and related technical resources.

Can modifier 59 be used with CPT 93306?

Modifier 59 should not be used routinely. It is appropriate only when the documentation supports a distinct service under applicable NCCI rules. It should not be used simply to override bundling edits.

Can modifiers 76 or 77 be used with CPT 93306?

They may apply to a medically necessary same-day repeat procedure. Modifier 76 identifies a repeat by the same practitioner, while modifier 77 identifies a repeat by another practitioner.