CPT 93306
Complete Echocardiogram with Doppler
How it is billed
- Complete means an attempt to obtain and document the full set of required views and structures, with any structure not visualised noted and the reason given
- Includes spectral Doppler and colour flow Doppler; the variants without Doppler have separate codes and pay differently
- Component split applies: professional and technical modifiers where the interpreting physician and the equipment owner differ
- A follow-up study examining a limited question is a limited echocardiogram, not a complete one repeated — repeating the complete code for interval checks is a recurring overpayment pattern
- Coverage is governed by local determinations, and both the indication and the frequency are tested against them
What the record must show
- A report documenting each required structure, with any that could not be visualised explicitly identified and explained — an incomplete study documented as complete is the finding reviewers look for
- Permanently recorded images retained in the record, since the interpretation is supported by the study rather than by the report alone
- The clinical indication, matched to the coverage policy of the relevant contractor, because echocardiography frequency limits are actively enforced
A worked example
A patient with new heart failure symptoms undergoes a full transthoracic study with Doppler. All required structures are imaged except one obscured by body habitus, which the report identifies and explains. That is a complete study and 93306 is correct.
Three months later the patient returns and a focused study is performed to reassess ventricular function alone. That is a limited echocardiogram with its own code — reporting the complete code because the same machine and the same protocol were used overstates the service.
Where the study is performed at a hospital and read by the practice's cardiologist, the practice bills the professional component only. Billing globally in that setting is the same error as on electrocardiography, and it generates the same duplicate denial against the facility's technical claim.
What decides payment
Echocardiography is one of the most closely watched imaging services in cardiology because volume is high, payment is meaningful, and the complete-versus-limited distinction is documented rather than physical. The same machine, the same patient and the same sonographer can produce either study, so only the report distinguishes them.
The requirement to explain non-visualised structures exists to protect complete studies performed on difficult patients. A study that genuinely attempted the full protocol and documented why one view failed remains complete; one that never attempted it does not.
Local coverage determinations set both indications and frequency, which is why the same follow-up interval can be payable in one jurisdiction and denied in another. Checking the applicable determination before scheduling a serial study prevents a denial that no coding choice can fix afterwards.
Denials this code attracts
Modifiers that apply
Codes billed alongside or confused with this one
Billed most in — Cardiology · Internal Medicine · Radiology
Terms used here — Medical Necessity · Modifier · Denial · Prior Authorization
How we handle it — Medical Coding · Prior Authorization · Denial Management
Primary sources
What the code-set maintainers and payers actually publish about billing 93306.
- Medicare Physician Fee Schedule lookup (opens in a new tab)
Centers for Medicare & Medicaid Services — Official allowed amounts by CPT/HCPCS code and locality. The reference point most commercial contracts are written against as a percentage.
- Medicare Coverage Database (LCD/NCD) (opens in a new tab)
Centers for Medicare & Medicaid Services — Searchable national and local coverage determinations. The direct answer to whether a diagnosis supports medical necessity for a given procedure.
- Medicare Claims Processing Manual (opens in a new tab)
Centers for Medicare & Medicaid Services — The operative manual for how Medicare claims must be coded, submitted, adjusted and appealed. When a payer policy and a vendor's advice disagree, this settles it.
Questions about CPT 93306
A complete transthoracic echocardiogram including spectral and colour flow Doppler. Complete refers to a defined set of structures the study must attempt to image and document.
The attempt to obtain and document the full required set of views and structures. Any structure not visualised must be identified with the reason. A study answering one focused question is a limited echocardiogram with its own code.
Only where the follow-up was itself a complete study. Interval checks addressing a single question are limited studies, and repeating the complete code for them is a recurring overpayment pattern in cardiology billing.
The physician who interprets the study and produces the report, using the professional modifier, when the equipment belongs to another entity. That entity bills the technical component separately.
Find out what your denials are costing you
A free billing audit reviews your denial rate, AR aging and clean claim rate against industry benchmarks. Takes about two minutes to request. No sales pitch.
No setup fees · You pay when we collect · Pricing from 3% of net collections