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CPT code 93356 covers myocardial strain imaging using speckle tracking, an advanced ultrasound technique that measures how well heart muscle stretches and contracts during each heartbeat. This helps doctors detect early signs of heart damage before traditional tests show problems.
RVU breakdown
Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High
Billing tips
Always bill 93356 as an add-on to a base echocardiography code (93303, 93304, 93306-93308, 93312, 93314, or 93350-93352); it cannot be billed alone
Impact: Prevents 100% automatic denial; this code has no value without a primary echo code on the same claim
Document specific strain values (global longitudinal strain percentage, regional strain curves) and clinical correlation in the final report, not just mention of speckle tracking software use
Impact: Reduces denial rate by approximately 60-70%; many payers deny when documentation only states 'strain imaging performed' without quantitative results
Verify payer-specific policies as many commercial insurers consider strain imaging experimental or investigational despite CPT code existence
Impact: Pre-authorization can increase payment success rate from 40% to 85% with restrictive payers; consider having patients sign ABN for Medicare Advantage plans
Bill non-facility rate ($35.26) only when performed in physician office with practice-owned equipment; use facility rate ($11.32) for hospital outpatient departments
Impact: Incorrect place of service coding results in $23.94 overpayment per claim subject to audit recoupment
Track time spent on post-processing separately; strain analysis typically adds 10-15 minutes to standard echo interpretation and should be documented
Impact: Strengthens medical necessity documentation and supports appeals; helps justify the 0.24 work RVU component
For chemotherapy monitoring, link to ICD-10 code Z79.899 (long-term drug therapy) or Z92.21 (personal history of antineoplastic chemotherapy) in addition to cardiac diagnosis
Impact: Improves approval rates by 30-40% for cardio-oncology applications where strain imaging has strongest evidence base
Common denials
Medical necessity not established - payer considers strain imaging experimental or not medically necessary for the diagnosis submitted
How to appeal: Submit peer-reviewed literature supporting strain imaging for the specific clinical indication (especially cardiotoxicity monitoring, HFpEF, subclinical dysfunction); reference ASE/EACVI guidelines; include comparative studies showing strain superiority over ejection fraction for early detection
Bundled/inclusive to base echocardiography code - payer states strain imaging is part of comprehensive echo and not separately billable
How to appeal: Cite CPT Assistant guidance that 93356 is separately reportable when speckle tracking strain analysis is performed; provide documentation showing dedicated post-processing time and specialized software beyond standard echo package; reference CCI edits showing no bundling between 93356 and base echo codes
Insufficient documentation - report does not contain quantitative strain data or clinical correlation of findings
How to appeal: Resubmit with complete strain report showing numerical GLS values, regional strain curves, bull's-eye plots, and clinical interpretation; attach screen captures from speckle tracking software if available; provide attestation of time spent on dedicated strain analysis
No base procedure billed - 93356 submitted without appropriate primary echocardiography code on same date of service
How to appeal: Verify claim transmission; resubmit with both base echo code and 93356 on same claim form with 93356 clearly marked as add-on; if base echo was denied separately, appeal both codes together explaining the complete service rendered
Frequently asked questions
What is the Medicare reimbursement rate for CPT code 93356 in 2025?
The 2025 Medicare national average payment for CPT 93356 is $35.26 in non-facility settings (physician office) and $11.32 in facility settings (hospital outpatient). The total RVU is 1.09 (0.24 work RVU, 0.83 non-facility PE RVU, 0.02 malpractice RVU) multiplied by the 2025 conversion factor of 32.3465.
Can CPT 93356 be billed alone or does it require another code?
CPT 93356 cannot be billed alone; it is an add-on code that must be reported with a primary echocardiography procedure code such as 93303, 93304, 93306, 93307, 93308, 93312, 93314, or 93350-93352. Billing 93356 without a base echo code will result in automatic denial.
What documentation is required to bill CPT 93356 for myocardial strain imaging?
Documentation must include explicit mention of speckle tracking strain analysis, quantitative strain measurements (especially global longitudinal strain percentage), regional strain values or curves, clinical correlation of findings, identification of the software used, and justification for why strain imaging was medically necessary beyond standard echocardiographic measurements. Simply stating 'strain imaging performed' without numerical data is insufficient.
Do commercial insurance companies cover CPT 93356?
Coverage varies significantly by payer. While Medicare recognizes the code, many commercial insurers consider strain imaging experimental or investigational, resulting in 40-60% denial rates. United Healthcare, Aetna, and some Blue Cross plans have specific coverage policies limiting 93356 to cardiotoxicity monitoring or research settings. Always verify coverage and consider obtaining pre-authorization before performing the service.
What is the difference between CPT 93356 and routine echocardiography measurements?
CPT 93356 represents dedicated speckle tracking strain analysis using specialized software to quantify myocardial deformation, which requires separate post-processing time beyond the standard echo study. Routine echocardiography (93306-93308) includes basic 2D measurements like ejection fraction and wall motion, but not the advanced strain mechanics analysis captured by 93356.
When is myocardial strain imaging medically necessary?
Strain imaging is most clearly indicated for monitoring cardiotoxicity in patients receiving chemotherapy (especially anthracyclines, trastuzumab), evaluating heart failure with preserved ejection fraction, detecting subclinical dysfunction in athletes or valvular disease patients, and assessing viability or dyssynchrony when standard measurements are inconclusive. Documentation should cite specific clinical guidelines supporting use for the patient's condition.
Can modifier 26 or TC be used with CPT 93356?
Yes, CPT 93356 can be split into professional (modifier 26) and technical (modifier TC) components when the physician interpretation and equipment/technologist services are billed separately, typically in hospital settings. The professional component represents approximately 40-50% of the total payment, while the technical component represents 50-60%. In physician offices billing the complete service, no modifier is needed.