Summary & Overview
CPT 76821: Doppler Ultrasound of Fetal Middle Cerebral Artery
Headline: CPT code 76821: Doppler Ultrasonography of Fetal Middle Cerebral Artery for Anemia Surveillance
Lead: CPT code 76821 represents Doppler ultrasonography of the fetal middle cerebral artery to determine blood-flow velocity for fetal surveillance. The test informs timing of labor induction and identifies fetal anemia severe enough to warrant transfusion, making it a critical diagnostic tool in maternal-fetal medicine.
What it represents and national relevance: CPT code 76821 captures a targeted Doppler evaluation used in pregnancies at risk for fetal anemia or compromise. Nationally, the code is important for tracking utilization of noninvasive fetal monitoring, guiding clinical decision-making in high-risk obstetrics, and informing payer coverage policies for maternal-fetal imaging.
Key payers covered: The analysis includes common national payers: Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
What readers will learn: This publication presents clinical context for use of CPT code 76821, typical sites of service, common billing modifiers and procedural considerations, and how payers approach coverage. Benchmarks and policy updates are summarized where available. The reader will gain an understanding of when this Doppler study is applied in practice, the clinical decisions it supports, and the payer landscape for obstetric Doppler imaging.
Data notes: Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes.
Billing Code Overview
CPT code 76821 describes Doppler ultrasonography of the fetal middle cerebral artery to measure blood-flow velocity for fetal surveillance. The procedure is used to assess fetal anemia severity and to guide timing of interventions such as labor induction or intrauterine transfusion.
Service type: Diagnostic obstetric ultrasound with Doppler assessment of fetal cerebral blood flow
Typical site of service: Hospital outpatient imaging department, maternal-fetal medicine clinic, or outpatient radiology/obstetrics clinic
Clinical & Coding Specifications
Clinical Context
A 30-year-old gravida 2 para 1 at 32 weeks gestation with a history of red cell alloimmunization presents to the maternal–fetal medicine clinic for fetal surveillance. Prior antibody screening revealed high-titer anti-D. The provider performs a targeted Doppler ultrasonography of the fetal middle cerebral artery to measure peak systolic velocity, assess for fetal anemia, and guide timing of intrauterine transfusion or delivery. The workflow includes maternal history and antibody review, fetal ultrasound to determine gestational age and fetal position, acquisition of a sagittal view of the fetal head, insonation of the proximal middle cerebral artery through the temporal bone, measurement of peak systolic velocity, documentation of machine settings and angle of insonation, interpretation by the maternal–fetal medicine specialist, and incorporation of the result into the plan of care (repeat surveillance interval, need for referral for intrauterine transfusion, or delivery planning). Typical site of service is an outpatient maternal–fetal medicine clinic or hospital-based obstetric ultrasound suite with potential inpatient monitoring for high-risk patients.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the interpreting physician's professional service separate from technical component |