76820 Ultrasound

CPT 76820

CPT 76820: Umbilical Artery DopplerUmbilical Artery Doppler

The short answer

Use 76820 for Doppler velocimetry of the umbilical artery, the flow study used to surveil fetal growth restriction and placental insufficiency. It is separately reportable alongside a growth scan such as 76816 performed at the same visit. Middle cerebral artery Doppler is its own code, 76821.

Source: NCCISource: CMS MPFS 2026Source: ACOG/SMFM

When to use 76820

Report 76820 when umbilical artery waveforms are measured and interpreted, almost always for suspected or confirmed fetal growth restriction, and sometimes for other placental insufficiency concerns in hypertensive disease or multiple gestation. The study frequently rides along with a growth scan or BPP at the same surveillance visit, and each service is separately reportable when separately documented. Routine umbilical Doppler in a low-risk pregnancy is not supported by specialty guidance and is a reliable denial.

When to use 76820 vs 76821

76820 · Umbilical artery

Growth restriction surveillance
Placental insufficiency question
S/D ratio, PI, absent or reversed flow
Often paired with 76816 or a BPP

76821 · Middle cerebral artery

Fetal anemia surveillance
Alloimmunization, parvovirus, TTTS
MCA peak systolic velocity
Also used for redistribution in FGR

Documentation checklist

The Doppler study is defensible when the indication and the measured indices are both on paper.

✓ Qualifying indication documented, most commonly fetal growth restriction

✓ Umbilical artery waveform obtained and stored

✓ Indices recorded: systolic/diastolic ratio, pulsatility or resistance index

✓ Absent or reversed end-diastolic flow noted when present

✓ Comparison to prior Doppler studies in a surveillance series

✓ Interpretation tied to management, such as delivery timing or increased surveillance

✓ Signed report; separate findings if billed with a same-day growth scan

Global package rules

76820 is billed outside the global obstetric package, separate from 59400, and separately from same-visit imaging such as 76816 or 76818 when each study is documented. Serial Dopplers at one- to two-week intervals are standard in growth restriction surveillance, so repeat claims are expected; keep the FGR diagnosis on every one. NCCI

TC-26 components

Split the components when the reading physician does not own the equipment: 76820-26 for the interpretation, 76820-TC for the technical side. MFM overread arrangements commonly bill serial umbilical Dopplers as professional-component-only claims.

76820

Global: one entity owns equipment and interpretation

76820-26

Professional: interpretation only

76820-TC

Technical: equipment and technologist

Reimbursement

2026 · national Medicare averages

Component	Work RVU	Total RVU	2026 rate
76820Global	0.49	1.35	$45.09
76820-26Professional	0.49	0.72	$24.05
76820-TCTechnical	0.00	0.63	$21.04

National amounts under the 2026 Medicare Physician Fee Schedule (non-facility total RVU x $33.4009 conversion factor, no locality/MAC adjustment). Commercial and Medicaid rates differ. Verify current values with your MAC before billing.

Common denials

CO-50 No qualifying indication

Why it happens

Umbilical Doppler was billed for a low-risk pregnancy or without a diagnosis supporting flow surveillance.

How to fix

Link the growth restriction or placental insufficiency diagnosis. Specialty guidance supports umbilical Doppler for FGR surveillance, not routine screening.

Source: ACOG/SMFM

CO-97 Bundled into same-day imaging

Why it happens

The payer collapsed the Doppler into a growth scan or BPP billed the same day.

How to fix

The Doppler is a distinct study with its own documentation. Append the payer's distinct-service modifier where required and appeal with both reports.

Source: NCCI

CO-151 Frequency threshold exceeded

Why it happens

Serial Doppler claims crossed the payer's utilization screen.

How to fix

Appeal with the surveillance protocol; weekly or more frequent Dopplers are supported in FGR with abnormal flow. Include the trend documentation.

Source: ACOG/SMFM

CO-16 Twin claim without distinguishing modifiers

Why it happens

Doppler lines for two fetuses read as duplicates.

How to fix

Bill per fetus on separate lines with modifier 59 on the additional fetus and per-fetus waveforms documented. Confirm the payer's preferred format.

Source: NCCI

CO-16 Missing TC-26 modifier

Why it happens

Component billing was expected and no modifier was appended.

How to fix

Bill 76820-26 for the read and let the facility bill 76820-TC, then resubmit.

Source: CMS

FAQ

What is the CPT code description for 76820?

In plain language, 76820 covers Doppler measurement of blood flow in the umbilical artery, the study used to monitor placental function when a fetus is growth restricted or at risk for placental insufficiency.

Can I bill 76820 with a growth scan on the same day?

Yes. The Doppler and the growth scan 76816 are distinct studies and both are payable when separately documented. Some payers want a distinct-service modifier on the Doppler line.

How is 76820 billed for twins?

Per fetus when each umbilical artery is separately studied, generally on separate lines with modifier 59 on the additional fetus. Payer formats vary, so verify before submitting, and flag any ambiguity for your coder.

How often can 76820 be billed?

As often as surveillance requires. In growth restriction with abnormal flow, weekly or twice-weekly Dopplers are guideline-supported. Carry the FGR diagnosis and the trend on every claim.

What is the difference between 76820 and 76821?

The vessel and the question. 76820 is the umbilical artery, primarily for growth restriction and placental function. 76821 is the middle cerebral artery, primarily for fetal anemia surveillance.

Is 76820 part of the global OB package?

No. Fetal Doppler studies are billed separately from 59400 on each date of service.

CPT® is a registered trademark of the American Medical Association. Educational reference only, not billing, legal, or medical advice. Maintained by Ouma Health, a maternal-fetal telemedicine practice. Printed from obcodingguide.com, content current as of July 2026.