Summary & Overview
CPT 76946: Ultrasound Guidance Imaging for Amniocentesis
CPT code 76946 captures the imaging supervision and interpretation component of ultrasound-guided amniocentesis, an invasive prenatal diagnostic procedure that withdraws amniotic fluid to test fetal cells and detect birth defects. This code matters nationally because it distinguishes the imaging professional's services from the invasive sampling procedure itself, affecting billing clarity, clinical documentation, and appropriate reimbursement for maternal-fetal imaging services. Major national payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will gain a concise understanding of the clinical context of CPT code 76946, where the service is typically delivered (hospital obstetrics units, outpatient surgery centers, and maternal-fetal medicine clinics), and why separate reporting of imaging supervision and interpretation is important for claims processing. The publication also outlines benchmarks and policy considerations relevant to payers and providers, highlights common modifiers used with imaging supervision codes, and summarizes documentation elements that support appropriate use. Data not available in the input will be noted where applicable.
Billing Code Overview
CPT code 76946 describes imaging supervision and interpretation for amniocentesis using ultrasound guidance. This service documents the physician or qualified health professional's role in providing real-time ultrasound guidance to locate the amniotic sac and monitor needle placement during a separately reportable amniocentesis procedure. The imaging supervision and interpretation are reported separately from the actual invasive diagnostic procedure that obtains amniotic fluid for fetal testing.
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Service type: Ultrasound guidance with imaging supervision and interpretation for an invasive obstetric diagnostic procedure
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Typical site of service: Hospital-based obstetrics units, outpatient surgery centers, and specialty maternal-fetal medicine clinics
Clinical & Coding Specifications
Clinical Context
A 34-year-old pregnant patient at 16 weeks' gestation is referred for diagnostic amniocentesis after a positive maternal serum screening and abnormal cell-free DNA result indicating increased risk for trisomy 21. The patient is counseled by Maternal-Fetal Medicine and elects to proceed. On the day of procedure, the patient is positioned supine in an ultrasound procedure room within the outpatient obstetric clinic. A targeted ultrasound exam is performed to confirm fetal viability, placental location, and an adequate amniotic fluid pocket. Under sterile conditions and local anesthesia, the operator uses real-time ultrasound guidance to direct a spinal needle through the maternal abdomen into the amniotic sac. A sample of amniotic fluid is withdrawn for genetic and cytogenetic testing. The provider documents imaging supervision and interpretation of the ultrasound guidance during the amniocentesis performed by the same or another qualified clinician. Post-procedure ultrasound confirms fetal motion and absence of immediate complications. The patient is observed briefly and given discharge instructions for signs of complications and follow-up for laboratory results.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the physician interpretation component of the ultrasound guidance separate from technical equipment charges. |