76816 Ultrasound

CPT 76816

CPT 76816: Follow-up Obstetric UltrasoundFollow-up Obstetric Ultrasound

The short answer

Use 76816 for a follow-up obstetric ultrasound that reassesses something already imaged: interval growth, amniotic fluid trending, or surveillance of a known finding. It is reported per fetus, with modifier 59 on additional fetuses. A first look at a new focused question is 76815, not a follow-up.

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

When to use 76816

Report 76816 for serial imaging: growth scans in a pregnancy with diabetes or hypertension, fluid checks after an abnormal finding, or re-evaluation of a placental or fetal finding seen on an earlier study. The code assumes a prior study exists and the question is interval change. It includes biometry, which is why serial growth checks belong here rather than under the limited code. Unlike 76815, 76816 is a per-fetus code: report it once for each fetus reassessed, appending modifier 59 to the second and subsequent lines.

When to use 76816 vs 76815

76816 · Follow-up

Reassessing a known finding or growth
Interval change is the question
Includes biometry and fluid reassessment
Per fetus, modifier 59 for additional

76815 · Limited

New focused question, first look
Viability, presentation, fluid, placenta
Once per encounter, any fetus count
No prior study being reassessed

Documentation checklist

The follow-up study is defensible when the record shows what is being followed and how it changed. Anchor every 76816 to the prior study and the ongoing indication.

✓ The finding or parameter under surveillance identified

✓ Reference to the prior study being compared against

✓ Interval biometry with growth assessment

✓ Amniotic fluid reassessed where relevant

✓ Per-fetus findings for multiple gestations

✓ Ongoing indication documented, such as diabetes, hypertension, or growth restriction

✓ Images stored and a signed interpretation with comparison statement

Global package rules

76816 is billed outside the global obstetric package and separately from 59400, no matter how many are performed across the pregnancy. There is no frequency cap in CPT itself, but payers apply medical-necessity screens to serial scans, so keep the surveillance indication on every claim. For twins, report 76816 once per fetus with modifier 59 on the additional lines. NCCI

TC-26 components

Split the components when the reading physician and equipment owner differ: modifier 26 for the interpretation, TC for the technical side. Serial growth scans read remotely as overreads go out as repeated 76816-26 claims with the comparison documented each time.

76816

Global: one entity owns equipment and interpretation

76816-26

Professional: interpretation only

76816-TC

Technical: equipment and technologist

Reimbursement

2026 · national Medicare averages

Component	Work RVU	Total RVU	2026 rate
76816Global	0.83	3.33	$111.22
76816-26Professional	0.83	1.22	$40.75
76816-TCTechnical	0.00	2.11	$70.48

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 Serial scans without a surveillance indication

Why it happens

Repeated growth scans were billed without a diagnosis that supports ongoing surveillance.

How to fix

Link the condition driving surveillance, such as gestational diabetes, hypertension, or fetal growth restriction, on every claim in the series.

Source: ACOG/SMFM

CO-97 Bundled into a same-day complete or detailed scan

Why it happens

76816 was reported with 76805 or 76811 for the same session and the payer collapsed them.

How to fix

Bill the complete or detailed study alone for that session. 76816 is for a separate follow-up encounter, not a same-session supplement.

Source: NCCI

CO-16 Twin claim missing modifier 59

Why it happens

Two units of 76816 were billed on one line or without a distinguishing modifier, and the payer saw a duplicate.

How to fix

Bill each fetus on its own line, appending modifier 59 to the second and subsequent fetuses, with per-fetus documentation.

Source: NCCI

CO-151 Frequency threshold exceeded

Why it happens

The number of follow-up scans crossed the payer's utilization screen for the pregnancy.

How to fix

Appeal with the surveillance protocol and the specialty-society guidance supporting the scan interval for the documented condition.

Source: CMS

CO-18 Flagged as an exact duplicate

Why it happens

Serial scans at short intervals, or twin lines without modifiers, matched a prior claim.

How to fix

Confirm the date of service and modifiers distinguish each study, then resubmit or appeal with both reports.

Source: CMS

FAQ

What is the CPT code description for 76816?

In plain language, 76816 covers a follow-up obstetric ultrasound that re-examines something found or measured before: fetal growth over time, amniotic fluid trends, or a known finding under surveillance. It includes repeat biometry and is reported per fetus.

How is 76816 different from 76815?

76816 looks backward, it reassesses a documented prior finding or growth. 76815 answers a new focused question with no prior study in play. The presence of a comparison is the dividing line.

How do I bill 76816 for twins?

One line per fetus reassessed, with modifier 59 on the second and subsequent lines. There is no additional-fetus add-on code for 76816; the per-fetus lines replace it.

How often can 76816 be billed in a pregnancy?

CPT sets no limit, and serial growth scans every three to four weeks are standard for many high-risk conditions. Payers apply necessity screens, so carry the surveillance diagnosis on each claim and expect to appeal past a payer's utilization threshold with records.

Is a growth scan after the anatomy survey 76805 again?

No. The complete anatomy survey is typically once per pregnancy. Subsequent growth or fluid checks are 76816, which is exactly what the code exists for.

Is 76816 part of the global OB package?

No. All obstetric ultrasounds are billed separately from 59400, including every scan in a surveillance series.

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.