A CPT 93306 claim can look correct and still fail because the report does not support a complete study, the claim contains an incorrect component modifier, or bundled Doppler services were billed separately. In 2026, medical billers must validate the clinical report, billing entity, place of service, payer policy, and current edits before releasing the claim.

Resilient MBS developed this guide to help billing teams apply CPT Code 93306 accurately while avoiding assumptions that frequently lead to echocardiogram denials.

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What Is CPT Code 93306?

CPT Code 93306 represents a complete transthoracic echocardiography study performed through the chest wall. The service includes:

• Real-time two-dimensional cardiac imaging

• Image documentation

• M-mode recording, when performed

• Complete spectral Doppler echocardiography

• Color flow velocity mapping

The study evaluates cardiac anatomy and function, including the chambers, valves, ventricular performance, blood-flow patterns and other clinically relevant structures.

The key billing word is complete. CPT 93306 should not be selected merely because an echocardiogram was ordered or because Doppler technology was available. The performed service and final report must support the components represented by the code.

CMS coverage guidance confirms that 93306 includes spectral and color flow Doppler as part of the complete evaluation.

Resilient MBS billing principle: Code from the completed test and signed interpretation, not from the appointment description, order title or equipment default.

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What Must Be Documented for CPT 93306?

Documentation must demonstrate that a complete transthoracic echocardiogram was medically necessary, performed and interpreted.

Clinical reason for the test

The medical record should identify the symptom, condition, abnormal finding or clinical question that prompted the study. Depending on the patient, this may involve:

• Suspected or known valvular disease

• Heart failure or ventricular dysfunction

• Cardiomyopathy

• Congenital cardiac abnormalities

• A clinically significant murmur

• Pericardial disease

• Pulmonary hypertension

• A change in cardiac signs, symptoms or clinical status

The diagnosis submitted on the claim must be supported by the medical record and accepted under the patient’s payer policy. A diagnosis that appears on one Medicare contractor’s covered-code list should not automatically be assumed valid for every payer or jurisdiction.

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Components of the examination

The report should support the structures and measurements required for a complete study. Medicare coverage guidance emphasizes that the record must substantiate medical necessity and the services billed.

A reliable report generally addresses relevant elements such as:

• Left and right ventricular size and function

• Left and right atrial anatomy

• Cardiac valves

• Aortic root or visible adjacent aorta

• Pericardium

• Hemodynamic findings

• Spectral Doppler findings

• Color flow findings

• Measurements and calculated values relevant to the examination

• Final interpretation and clinical impression

Not every structure will always be visualized perfectly. However, the report should explain technical limitations rather than silently omitting required elements.

Signed interpretation

When the professional component is billed, the interpreting physician or qualified practitioner must provide a completed interpretation and report. A collection of measurements or sonographer worksheets alone does not establish the professional interpretation.

Resilient MBS documentation check: Confirm that the order, clinical indication, performed study and final signed report tell the same story before submitting the claim.

CPT 93306 Versus 93307 and 93308

Choosing among these codes depends on what was actually performed and documented.

CPT 93306

Use 93306 for a complete transthoracic study that includes spectral Doppler and color flow Doppler.

CPT 93307

CPT 93307 represents a complete transthoracic echocardiographic study without the Doppler services already built into 93306.

When medically necessary Doppler work is separately performed with 93307, applicable Doppler codes may be considered according to current CPT, payer and NCCI instructions. Do not assume they are automatically payable.

CPT 93308

CPT 93308 represents a limited or follow-up transthoracic study. It may be appropriate when the clinician evaluates a focused cardiac question rather than repeating a complete examination.

A prior complete study does not automatically make every later examination limited. Likewise, describing a study as “limited” in the order does not override a report documenting a different service. Select the code that accurately reflects the work performed.

Resilient MBS coding safeguard: Do not downcode or upcode based on reimbursement expectations. Match the code to the scope and documented components of the examination.

Do Not Separately Bill Doppler Services Included in 93306

CPT 93306 already includes complete spectral Doppler and color flow Doppler. Billers should not routinely add Doppler echocardiography codes such as 93320, 93321 or 93325 to 93306.

Submitting included Doppler services separately can result in:

• NCCI edit denials

• Bundling denials

• Overpayment exposure

• Post-payment recoupment

• Unnecessary appeals

• Compliance concerns

CMS instructs providers to apply current NCCI procedure-to-procedure edits and applicable outpatient packaging rules before billing Medicare.

A modifier should never be used merely to bypass an edit. An NCCI-associated modifier is appropriate only when the services are genuinely distinct and the medical record satisfies the modifier’s requirements.

Resilient MBS compliance rule: Treat an edit as a signal to review the claim, not as an invitation to append modifier 59 automatically.

Modifiers for CPT Code 93306

The correct modifier depends on which part of the service the billing entity performed.

Modifier 26: Professional component

Append modifier 26 when the billing provider performed only the interpretation and report.

Example: A hospital owns the equipment and employs the sonographer, while an independent cardiologist interprets the examination and submits the professional claim.

Modifier TC: Technical component

Append modifier TC when the billing entity provided only the equipment, supplies, technician and other technical resources.

The entity must meet Medicare enrollment, supervision and place-of-service requirements applicable to the service.

No component modifier: Global service

Report CPT 93306 without modifier 26 or TC when the same eligible billing entity furnished both the technical and professional components and may bill globally.

Billers must ensure that another entity has not already billed one of the components. Duplicate global, technical or professional claims are a common source of denials.

Modifiers 76 and 77: Repeat procedures

A repeat echocardiogram may require:

• Modifier 76 when the same physician or qualified professional repeats the procedure

• Modifier 77 when another physician or qualified professional repeats it

The record must explain why the repeat test was medically necessary. A modifier identifies the repeat service but does not establish medical necessity by itself.

Modifier 52: Reduced services

Modifier 52 may be considered when a service is partially reduced or discontinued under circumstances that meet payer requirements. It should not be applied routinely to turn an incomplete complete study into a payable 93306 claim.

When the documented examination is limited, the limited-study code may be more accurate. Resilient MBS recommends reviewing the full report and payer instructions before choosing between a reduced-service modifier and a different procedure code.

2026 Medicare and NCCI Rules Billers Must Know

The 2026 CMS NCCI Policy Manual continues to impose important restrictions on echocardiography billing.

Echocardiography during valve procedures

CMS states that transthoracic echocardiography codes 93306 through 93308 and specified Doppler echocardiography services are not separately reportable by the physician performing a transcatheter aortic or mitral valve replacement procedure.

This restriction matters when reviewing same-day procedural claims. Billers should examine:

• Who performed the echocardiography

• The purpose of the imaging

• Whether it was inherent to procedural guidance

• Whether the same physician performed the valve procedure

• Current NCCI edits and modifier indicators

Contrast administration

CMS explains that intravenous injection services used to administer echocardiographic contrast are not separately reportable merely because contrast was used during the examination.

For hospital outpatient departments paid under OPPS, CMS directs facilities to report the applicable contrast echocardiography HCPCS C-code rather than the corresponding noncontrast CPT code when contrast is used. These C-codes include the related noncontrast echocardiography performed during the same encounter.

Professional, office, independent diagnostic testing facility and hospital outpatient billing rules are not interchangeable. Resilient MBS recommends validating the claim against its exact setting before code selection.

No universal reimbursement amount

CPT does not establish payment rates. Medicare payment depends on factors such as:

• Year-specific Medicare Physician Fee Schedule data

• Geographic locality

• Facility or nonfacility setting

• Global, professional or technical billing

• Provider participation status

• Payer contract

• Applicable payment adjustments

CMS provides a Physician Fee Schedule lookup tool for current Medicare payment information.

Avoid publishing or relying on one national “93306 reimbursement rate” without identifying the payer, locality, component, year and place of service.

Texas and Virginia Billing Considerations

Practices in Texas and Virginia operate under different Medicare Administrative Contractor jurisdictions.

Texas Medicare Part A and Part B providers generally work with Novitas Solutions under Jurisdiction H, while Virginia providers generally work with Palmetto GBA under Jurisdiction M. Local articles, diagnosis lists, medical-review activity and claim instructions can therefore differ.

Palmetto has specifically identified CPT 93306 for medical review activity during the August 2025 through July 2026 review period, reinforcing the need for complete records in its jurisdiction.

Before filing a Medicare claim, Resilient MBS recommends that Texas and Virginia billers confirm:

1. The active LCD or billing article for the jurisdiction

2. The covered diagnosis requirements

3. Any frequency or utilization limitations

4. Documentation requirements

5. Current NCCI edits

6. Place-of-service and component rules

7. Whether a payer-specific authorization is required

Commercial Medicare Advantage and Medicaid managed-care plans may apply policies that differ from traditional Medicare. Do not substitute a CMS LCD for the individual plan’s current policy.

Common CPT 93306 Denials

Medical necessity not supported

The diagnosis may be too vague, absent from the payer’s policy or unsupported by the encounter documentation.

Action: Compare the order, progress note, diagnosis and payer coverage policy before submission.

Complete study not documented

The report may omit spectral Doppler, color flow findings or the scope expected for a complete examination.

Action: Query the provider when the documentation does not clearly establish the performed service. Never add clinical information that is not in the record.

Incorrect component modifier

A provider may submit the global code when only the interpretation was performed, or both entities may bill globally.

Action: Verify equipment ownership, technician employment, interpretation responsibility and contractual billing arrangements.

Bundled Doppler codes

The claim may include Doppler services already represented by CPT 93306.

Action: Run current NCCI edits before claim release and remove separately reported inclusive services unless authoritative guidance supports distinct billing.

Repeat-service denial

The payer may treat a second study as a duplicate.

Action: Confirm that the repeat test was medically necessary, identify whether the same or a different physician repeated it, and apply the appropriate modifier only when supported.

Authorization mismatch

The authorization may identify a different procedure, date range, servicing location or rendering provider.

Action: Match the authorization to the final performed service before claim submission.

Resilient MBS Pre-Bill Checklist for CPT 93306

Before releasing the claim, confirm:

• A valid order or documented treating-provider intent is present

• The clinical indication supports medical necessity

• The complete examination is documented

• Spectral Doppler is documented

• Color flow Doppler is documented

• The final interpretation is signed

• The diagnosis matches the medical record

• The correct billing component is selected

• The place of service is accurate

• No included Doppler service is billed separately

• Repeat-procedure modifiers are supported when applicable

• Contrast coding matches the care setting

• Authorization requirements are satisfied

• Current payer, MAC and NCCI rules have been checked

This workflow gives Resilient MBS billing teams a consistent way to identify errors before they become rejections, denials or post-payment findings.

FAQs

What does CPT Code 93306 include?

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

Can 93320 or 93325 be billed with 93306?

These Doppler services are already included in CPT 93306 and should not ordinarily be reported separately. Review current CPT instructions, NCCI edits and payer policy before billing any related code combination.

Does CPT 93306 require modifier 26?

Modifier 26 is required when the billing provider performs only the professional interpretation and report. Do not append it when the eligible billing entity is correctly billing the complete global service.

When should modifier TC be used with 93306?

Use modifier TC when the billing entity furnished only the technical component, subject to payer enrollment, supervision and place-of-service requirements.

Is prior authorization required for CPT 93306?

Medicare and commercial payer requirements vary. Some plans require authorization or notification for outpatient cardiac imaging. Verify the patient’s specific plan before the service rather than relying on a general payer assumption.

Can CPT 93306 be billed more than once?

A repeat study may be billable when it is medically reasonable and necessary. The documentation must explain the clinical reason for repetition, and modifiers 76 or 77 may apply depending on who repeated the procedure.

Final Takeaway

Accurate CPT Code 93306 billing depends on more than selecting an echocardiogram code. Billers must confirm that the study is complete, Doppler components are documented, component modifiers are correct, bundled services are excluded and the diagnosis satisfies the current payer policy.

Resilient MBS helps medical billing professionals and healthcare organizations strengthen cardiac imaging workflows through documentation review, denial prevention and payer-specific claim validation. For practices in Texas, Virginia and across the USA, a structured pre-bill review can turn CPT 93306 from a recurring denial risk into a controlled, defensible billing process.