A maternal fetal medicine ultrasound billed under CPT 76811, often called the detailed fetal anatomy scan 76811, is the most comprehensive anatomic evaluation performed in pregnancy. It goes well beyond the standard second-trimester scan, adding a targeted, organ-by-organ assessment reserved for pregnancies at increased risk for a fetal structural or genetic problem. Understanding what the 76811 examines, and why it is coded and staffed differently, helps referring clinicians and informed buyers know when this level of imaging is warranted.
What is a CPT 76811 detailed anatomy scan?
CPT 76811 describes a detailed fetal anatomic examination, sometimes referred to informally as a "level 2 ultrasound." It is distinguished from CPT 76805, the standard second- or third-trimester obstetric ultrasound after 14 weeks. The 76805 scan documents fetal number, presentation, cardiac activity, amniotic fluid, placental location, and a basic survey of anatomy. The 76811 includes all of that plus a systematic, higher-resolution evaluation of individual organ systems.
Coding guidance is specific on this point. The 76811 is intended to be performed once per pregnancy per practice for a given indication, not as a routine substitute for the standard scan. It requires a documented reason for the more detailed study, and it is typically performed by, or under the supervision of, clinicians with advanced training in fetal imaging, such as maternal-fetal medicine specialists.
What does a maternal-fetal medicine ultrasound check?
The detailed anatomy scan evaluates fetal structures system by system. A thorough 76811 study generally documents:
- Head and brain: skull shape, midline structures, ventricles, cerebellum, cisterna magna, and the corpus callosum when views allow.
- Face and neck: orbits, nasal bone, upper lip for clefting, profile, and nuchal region.
- Heart: a detailed cardiac evaluation including the four-chamber view, outflow tracts, three-vessel view, and aortic and ductal arches. Cardiac anomalies are among the most common major malformations, and this is a central focus of the exam.
- Chest: lungs, diaphragm, and thoracic contour.
- Abdomen: stomach, bowel, kidneys, bladder, abdominal wall and cord insertion.
- Spine: each segment in multiple planes to screen for neural tube defects.
- Extremities: long bones, hands, and feet, including position and count when feasible.
- Placenta, cord, and amniotic fluid: placental location and appearance, umbilical cord vessel number, and fluid volume.
Depending on the indication, the study may be paired with additional coded procedures such as a fetal echocardiogram, Doppler studies, or a cervical length measurement. Professional bodies including AIUM, ACOG, and SMFM publish practice parameters describing the components and documentation expected in a detailed fetal anatomic examination, and AIUM standards are widely used to define adequate imaging and reporting.
How is the 76811 different from a standard anatomy scan?
The difference is depth, indication, and expertise rather than simply timing. A standard 76805 scan is appropriate for most pregnancies and provides a reliable overview of fetal anatomy. The 76811 is indication-driven: it is ordered when history, screening results, or findings on a prior scan raise the pre-test probability of an anomaly.
Three practical distinctions matter for referring practices:
- Documentation burden. The 76811 requires more extensive image capture and a detailed written report addressing each organ system.
- Interpreter training. The exam is designed to be interpreted by clinicians with subspecialty-level fetal imaging expertise, which is where maternal-fetal medicine plays a defining role.
- Follow-up pathway. Because the 76811 is often abnormal or equivocal in a meaningful share of referred cases, it needs to connect directly to counseling, genetic testing options, and a management plan.
Who should have a detailed fetal anatomy scan?
The 76811 is reserved for pregnancies with a recognized indication. Common reasons a clinician orders a detailed maternal-fetal medicine ultrasound include:
- An abnormal or high-risk result on aneuploidy screening, including cell-free DNA screening.
- A suspected anomaly or an incompletely visualized structure on a prior scan.
- A prior pregnancy or family history of a congenital anomaly or genetic condition.
- Maternal conditions associated with fetal risk, such as pregestational diabetes.
- Certain maternal medication exposures or teratogen concerns.
- Multiple gestation, particularly monochorionic pregnancies.
- Findings such as abnormal amniotic fluid volume or growth abnormalities.
These overlap heavily with the broader indications for high-risk pregnancy ultrasound, which is why the detailed scan is a core tool in high-risk obstetric care rather than a routine screening step.
What should patients and referring clinicians expect?
For patients, the experience resembles a standard ultrasound but usually takes longer, often 45 minutes or more, because each structure is imaged deliberately. Fetal position, maternal body habitus, and gestational age can all limit visualization, and it is common for one or more structures to require a repeat or follow-up study to complete. A normal detailed scan meaningfully lowers, but does not entirely eliminate, the chance of a structural anomaly, since ultrasound cannot detect every condition.
For referring clinicians, the value of the 76811 depends on who interprets it and how quickly the interpretation reaches the care team. A detailed scan is only as useful as the report and the counseling that follow. That is where subspecialty involvement, whether on-site or through remote interpretation, closes the gap between imaging and a clear plan.
Frequently asked questions
What is the difference between CPT 76811 and 76805?
76805 is the standard second- or third-trimester obstetric ultrasound with a basic anatomic survey. 76811 is a detailed fetal anatomic examination that adds a systematic, organ-by-organ evaluation and is performed for a specific indication, typically with maternal-fetal medicine expertise.
Is a 76811 the same as a "level 2 ultrasound"?
"Level 2 ultrasound" is an informal term many people use for the detailed anatomy scan. In current coding, that detailed study corresponds to CPT 76811 rather than the standard 76805 scan.
Does a normal detailed anatomy scan guarantee a healthy baby?
No. A normal 76811 substantially lowers the likelihood of a major structural anomaly, but ultrasound cannot detect every genetic or structural condition, and some findings emerge only later in pregnancy.
Who should read a detailed fetal anatomy scan?
Detailed anatomic examinations are designed to be interpreted by clinicians with advanced fetal imaging training, most often maternal-fetal medicine specialists, consistent with AIUM, ACOG, and SMFM practice parameters.
Ouma Health is a physician-led maternal-fetal medicine practice, not an app, that partners with hospitals, clinics, and health plans to extend subspecialty fetal imaging expertise where it is needed. Through remote ultrasound interpretation, MFM physicians review detailed anatomy studies and communicate findings to the local care team, helping practices offer subspecialty-grade reads without an on-site MFM. Learn more about our approach to ultrasound interpretation.
