Summary & Overview
CPT 76812: Add-On Transabdominal Ultrasound for Additional Fetus
CPT code 76812 designates an add-on transabdominal ultrasound performed to examine an additional fetus in detail beyond the routine fetal and maternal examination. As an add-on imaging code, it captures supplemental imaging effort when multiple fetuses require separate, focused assessment during the same encounter. Nationally, this code matters for accurate reporting of reproductive imaging complexity, resource allocation in prenatal care, and appropriate billing for multiple-gestation evaluations.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical intent and service context for 76812, payer coverage considerations and common modifiers used with fetal ultrasound add-on services, and the typical sites where this service is delivered. The publication also outlines benchmarking conventions, coding relationships to routine fetal ultrasound services, and practical billing notes relevant to multi-fetal imaging encounters.
This summary is intended for clinicians, billing professionals, and policy analysts seeking a national perspective on the code’s clinical role, documentation expectations, and how payers commonly treat add-on fetal ultrasound services.
Billing Code Overview
CPT code 76812 is an add-on transabdominal fetal ultrasound used to perform a detailed examination of an additional fetus beyond the routine fetal and maternal examination. The procedure is performed by a qualified provider using transabdominal sonography to evaluate fetal anatomy, growth, or other clinical concerns specific to the additional fetus.
Service Type: Diagnostic fetal ultrasound — add-on detailed transabdominal study
Typical Site of Service: Outpatient imaging center, hospital outpatient department, or obstetrics/gynecology clinic with ultrasound capabilities
Clinical & Coding Specifications
Clinical Context
A typical patient is a pregnant individual undergoing ultrasound evaluation of a multifetal pregnancy (twins or higher-order) during the second-trimester anatomic survey or when a specific concern arises for one fetus. The primary ultrasound (routine fetal and maternal examination) is performed first, including fetal biometry, placenta, amniotic fluid assessment, and maternal uterus and adnexa. When one fetus requires more detailed transabdominal imaging — for example, suspected structural anomaly, abnormal growth pattern, discordant anatomy, or targeted cardiac evaluation — the provider performs an additional detailed transabdominal ultrasound of that specific fetus under add-on code 76812 in the same encounter. Typical workflow: scheduling for obstetric ultrasound, patient arrival and consent, baseline maternal and fetal assessment (billing primary obstetric ultrasound code such as fetal anatomic survey), identification of an indication to image an additional fetus in detail, acquisition of additional targeted images of the separate fetus, documentation of findings and measurements, and final report. Typical site of service is an outpatient radiology or obstetrics/gynecology imaging suite, ambulatory surgery center when related to maternal procedures, or inpatient maternal-fetal medicine unit for high-risk patients. A realistic scenario: a patient with dichorionic diamniotic twins undergoes a routine anatomic survey; one twin shows ventricular size discrepancy prompting the provider to perform a focused detailed transabdominal ultrasound of that affected twin and report using 76812 as the add-on procedure.
Coding Specifications
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