Coding for Ultrasound in Pregnancy: 2026 CPT Guide & Guidelines

2026 Quick Guide: OB Ultrasound

• First Trimester: Use 76801 (Single) + 76802 (Add-on) for scans < 14 weeks.
• Anatomy Scan: 76805 is the standard Level I exam. 76811 is Level II (High Risk only).
• Multi-Gestation: Most codes have “each additional fetus” add-ons. 76815 is the exception (billed once per exam).
• Follow-Up: Use 76816 per fetus for growth/re-eval. Do not bill a new 76805 unless a completely new problem requires a full survey.

Ultrasound is a vital tool in prenatal care, used to visualize the developing fetus and maternal anatomy at various stages of pregnancy. Accurate coding of obstetric ultrasound procedures is critical for proper documentation and billing, ensuring that the type and scope of each exam are clearly identified.

The American College of Obstetricians and Gynecologists (ACOG) generally recommends at least one routine ultrasound for all pregnancies (often around 18–22 weeks for a fetal anatomy survey), with additional ultrasounds performed as needed for medical indications.

1. First Trimester Ultrasound Exams (< 14 Weeks)

During the first trimester (up to 13 weeks 6 days), ultrasound confirms pregnancy, viability, and gestational age. Specific CPT codes apply:

Note: A full first-trimester exam (76801) includes assessment of the uterus, gestational sac, embryo (CRL), and adnexa. If both transvaginal (76817) and transabdominal (76801) are used in the same session to complete the exam, usually only the comprehensive code (76801) is billed, unless distinct separate exams were performed.

2. Second Trimester Anatomy Ultrasound (Standard)

The mid-trimester “anatomy scan” is typically performed around 18–22 weeks. This is the routine screening scan.

• 76805 – Ultrasound, pregnant uterus, ≥14 weeks, transabdominal; single or first gestation. This represents a complete evaluation including head, heart, spine, abdomen, placenta, and biometry.
• +76810 – Ultrasound, ≥14 weeks, each additional gestation. Used for the second twin in an anatomy scan.

In an uncomplicated pregnancy, only one comprehensive anatomy scan (76805) is typically reimbursed as routine. Subsequent complete scans require distinct medical necessity (e.g., trauma, new abnormality).

3. Detailed Fetal Anatomic Ultrasound (Level II)

Reserved for high-risk situations or when an anomaly is suspected.

• 76811 – Fetal and maternal evaluation plus detailed fetal anatomic examination, single gestation.
• +76812 – Detailed obstetric ultrasound, each additional gestation.

Warning: The Society for Maternal-Fetal Medicine (SMFM) states 76811 should not be used for routine screening. It requires detailed evaluation of brain ventricles, face, cardiac outflow tracts, and digits.

4. Limited Obstetric Ultrasound

A “limited” scan addresses a specific, focused clinical question.

• 76815 – Ultrasound, pregnant uterus, limited (e.g., fetal heartbeat, placental location, fetal position, fluid volume).

Crucial Rule: This code covers “one or more fetuses”. It should be reported only once per exam, even if the patient is carrying twins or triplets. Common uses include checking fetal heart rate in bleeding or verifying breech presentation.

5. Follow-Up Ultrasound (Growth and Re-Evaluation)

Used for monitoring growth or re-checking abnormalities seen on a prior scan.

• 76816 – Ultrasound, pregnant uterus, follow-up or repeat study (e.g., re-eval of fetal size/growth or organ system), transabdominal, per fetus.

Coding Nuance: Unlike 76815, code 76816 is reported once for each fetus. Scenario: Twins growth check. Bill: 76816 (Twin A) and 76816-59 (Twin B).

Use 76816 only if a prior complete exam (76805 or 76811) has already been done. If a patient presents with a completely new problem (e.g., decreased fetal movement) requiring a full survey, a new 76805 might be appropriate. If the scan is to monitor known issues (e.g., IUGR), use 76816.

6. Other Specialized OB Ultrasound Codes

These codes address specific high-risk indications:

• Biophysical Profile (BPP):
  • 76818: BPP with Non-Stress Test (NST).
  • 76819: BPP without NST.
• Doppler Studies:
  • 76820: Umbilical Artery Doppler.
  • 76821: Middle Cerebral Artery (MCA) Doppler.
• Fetal Echocardiography:
  • 76825: Initial fetal echo (Complete).
  • 76826: Follow-up fetal echo.
  • 93325: Color Doppler add-on.

Note: 3D/4D rendering codes (76376/76377) are generally only billable if medically necessary for clinical decision-making (e.g., facial cleft evaluation), not for routine “keepsake” images.

flowchart TD
    A[OB Ultrasound Ordered] --> B{Gestational Age?}
    B -->|< 14 weeks| C{Exam Type?}
    B -->|>= 14 weeks| D{Exam Type?}
    C -->|Complete| E[76801 + 76802 per extra fetus]
    C -->|Nuchal Translucency| F[76813 + 76814 per extra fetus]
    C -->|Transvaginal| G[76817]
    D -->|Anatomy Level I| H[76805 + 76810 per extra fetus]
    D -->|Detailed Level II| I[76811 + 76812 per extra fetus]
    D -->|Limited / Focused| J[76815 once per exam]
    D -->|Follow-Up / Growth| K[76816 per fetus]
    D -->|Biophysical Profile| L{With NST?}
    L -->|Yes| M[76818]
    L -->|No| N[76819]

7. Coding for Multiple Gestations

Correct coding for twins/triplets requires using the appropriate add-on codes. Follow this logic:

8. Documentation and Best Practices

Proper documentation is key to avoiding denials.

• Complete Exams (76805): Report must document all required elements (head, heart, spine, abdomen, placenta, biometry). If elements are missing without valid reason (e.g., fetal position), downcode to 76815 or 76816.
• Detailed Exams (76811): Report must list the specific non-routine structures examined (e.g., cerebellum, outflow tracts) to justify the higher code.
• Medical Necessity: “Gender reveal” or “Keepsake” scans are not billable. Every scan must have a medical indication (e.g., “size less than dates,” “maternal diabetes”).
• Transvaginal (76817): Documentation must explicitly state the probe approach was transvaginal.