Maternal-Fetal Medicine Billing & Coding Guide
Detailed OB ultrasound, biophysical profile, antepartum surveillance for high-risk pregnancy.
Common Maternal-Fetal Medicine CPT Codes
Ranked by claim frequency, with current MPFS work RVUs and global periods.
| Code | Description | Work RVU | Total RVU | Global |
|---|---|---|---|---|
| 76801 | Ob us < 14 wks single fetus | 0.97 | 3.50 | XXX |
| 76802 | Ob us < 14 wks addl fetus | 0.81 | 1.81 | ZZZ |
| 76805 | Ob us >/= 14 wks sngl fetus | 0.97 | 4.07 | XXX |
| 76810 | Ob us >/= 14 wks addl fetus | 0.96 | 2.65 | ZZZ |
| 76811 | Ob us detailed sngl fetus | 1.85 | 5.45 | XXX |
| 76812 | Ob us detailed addl fetus | 1.74 | 5.82 | ZZZ |
| 76813 | Ob us nuchal meas 1 gest | 1.15 | 3.46 | XXX |
| 76814 | Ob us nuchal meas add-on | 0.97 | 2.24 | ZZZ |
| 76815 | Ob us limited fetus(s) | 0.63 | 2.44 | XXX |
| 76816 | Ob us follow-up per fetus | 0.83 | 3.33 | XXX |
| 76817 | Transvaginal us obstetric | 0.73 | 2.78 | XXX |
| 76818 | Fetal biophys profile w/nst | 1.02 | 3.65 | XXX |
| 76819 | Fetal biophys profil w/o nst | 0.75 | 2.63 | XXX |
| 76820 | Umbilical artery echo | 0.49 | 1.35 | XXX |
| 76821 | Middle cerebral artery echo | 0.68 | 2.70 | XXX |
| 76825 | Echo exam of fetal heart | 1.63 | 7.84 | XXX |
| 76826 | Echo exam of fetal heart | 0.81 | 4.74 | XXX |
| 76827 | Echo exam of fetal heart | 0.57 | 2.09 | XXX |
| 76828 | Echo exam of fetal heart | 0.55 | 1.48 | XXX |
| 59025 | Fetal non-stress test | 0.52 | 1.51 | 000 |
What Maternal-Fetal Medicine practices are leaving on the table
High-value services that consistently get under-billed across the specialty. Each one is rooted in current 2026 fee schedule and policy updates.
Fetal echocardiography (76825) under-reported in practices performing anatomy scans on diabetic, hypertensive, or prior cardiac-anomaly pregnancies. Impact: 76825 work RVU 1.63 vs. 76811 1.85; missing $80-120 per case. Workflow: Add checkbox in anatomy scan template: 'Detailed cardiac evaluation performed (four-chamber view, outflow tracts assessed)?' If yes, code 76825 instead of 76811 or append 76825 with -59.
Doppler studies (76820 umbilical artery, 76821 MCA) separately undercoded when performed during routine anatomy ultrasound for high-risk pregnancies (IUGR, maternal disease). Impact: 76821 RVU 0.68, commonly bundled into 76811 without separate line item; $50-70 per study. Workflow: In imaging report, create separate 'Doppler Assessment' section; if Doppler performed, assign separate code with clinical indication (e.g., 'Umbilical artery Doppler for asymmetric IUGR evaluation').
Modifier 57 (decision for surgery) E/M under-applied when patient counseled and consented for in-utero intervention (59072 cord occlusion, 59076 shunt placement, 59070 amnioinfusion). Impact: 99204 RVU 2.6 plus 59072 RVU 8.77; modifier 57 ensures separate payment vs. global bundling. Workflow: If intervention performed same day as decision visit, document separate 'Surgical consultation and counseling' note with indication, risks/benefits, patient questions; append 99204-57.
Transvaginal obstetric ultrasound (76817) in early pregnancy bleeding or placenta previa cases overlooked; coded as 76805 instead. Impact: 76817 RVU 0.73 vs. 76805 1.19 appears lower but correctly captures imaging approach; prevents audit questions on appropriateness. Workflow: In early pregnancy (<14 weeks with vaginal bleeding or risk factors) or when cervical/lower uterine assessment required, specify '76817 transvaginal' in imaging order; report as separate code with clinical indication.
Code pairs that auto-bundle to CO-97
From the National Correct Coding Initiative for Maternal-Fetal Medicine. The rationale tells you when a modifier legitimately bypasses the edit and when it cannot.
Fetal biophysical profile with NST (76818) includes the non-stress test component. Modifier 59 does not bypass this bundle. Only separate if NST performed at different time/date with separate documentation.
Detailed obstetric ultrasound (76811) is not separately reportable with standard obstetric ultrasound (76805) on same date. Use 76811 alone if detailed anatomy performed.
Fetal echocardiography (76825) can be reported separately from fetal anatomy ultrasound (76811) only with modifier 59 and documentation showing distinct clinical purpose (cardiac evaluation vs. routine anatomy).
Modifier Guidance for Maternal-Fetal Medicine
When each modifier legitimately applies in this specialty, with denial-pattern context and audit-defense documentation.
Append to E/M code when physician performs significant evaluation separate from procedure/imaging work. Example: Patient presents with vaginal bleeding at 20 weeks; physician obtains history, performs physical exam, assesses risk, then performs 76805 ultrasound to rule out placental abruption. The E/M is medically separate from the imaging service, justifying 99203-25 and 76805.
Use to separate normally bundled procedures when performed for distinct clinical reasons on same date. Example: 76821 (middle cerebral artery doppler) appended with -59 when performed on separate scan occasion from 76811 (detailed anatomy) due to polyhydramnios concern requiring additional vascular assessment. Requires separate documentation of clinical indication.
Applied when radiologist provides interpretation-only service without performing ultrasound (technical component billed by facility). In maternal-fetal medicine office settings, rarely used; most practices bill global codes.
Used when E/M service results in decision to perform surgery same day. Example: Patient counseled for preterm delivery risk, decision made for in-utero intervention; code E/M as 99204-57 with 59072 (umbilical cord occlusion) to show E/M drove surgical decision.
Attests medical necessity documentation meets payer-specific criteria for advanced imaging or intervention. Some payers require KX when billing multiple fetal ultrasounds or advanced doppler studies to confirm policy-defined clinical criteria documented.
Documentation requirements
What needs to live in the encounter note for these codes to survive a payer audit.
- Gestational age confirmed by LMP or first-trimester dating scan, documented in plan of care; supports code selection (76801-76814 depend on gestational age bands and directly affect RVU/reimbursement).
- Clinical indication for each distinct imaging service (e.g., 'EFW assessment' vs. 'cardiac evaluation' vs. 'Doppler for oligohydramnios') to justify separate codes and defend against bundling denials.
- Time-and-motion note if billing multiple ultrasound codes same date (e.g., 76811 then 76821); shows separate encounter/distinct clinical question, required for 59 modifier defense.
- Number of fetuses explicitly stated at start of imaging report; underlies add-on code selection (76802, 76810, 76812, 76814 vs. primary codes) and coding accuracy.
- Physician signature and interpretation on ultrasound report, not just technician scanning; confirms physician work performed if using modifier 26 or defending professional component when facility separately reports technical component.
- Prior ultrasound results and reason for follow-up when coding 76816 (follow-up per fetus); distinguishes medically necessary repeat from routine screening, critical for medical review and denial avoidance.
OIG and audit triggers in Maternal-Fetal Medicine
Patterns that show up in OIG Work Plans, RAC audits, and CERT improper payment reviews. Build internal compliance checks around these.
RAC pattern: Unbundling 76818 (biophysical profile with NST) by separately reporting 59025 (fetal NST) without modifier 59 or clinical justification. Audit finding: NST inherently included in 76818 RVU. Defense: Append modifier 59 only if NST performed at different encounter or with separate clinical documentation showing distinct medical necessity.
OIG Work Plan 2025-2026: Maternal fetal medicine practices over-utilizing advanced imaging (76825 fetal echocardiography, 76821 MCA Doppler) without documented fetal anomaly or maternal indication per ACOG guidelines. Defense: Maintain order notes with specific clinical question (e.g., 'maternal diabetes, assess for cardiac ouflow obstruction') and imaging report linking findings to diagnosis.
RAC pattern: Multiple modifier 59 applications on same-date ultrasound codes (e.g., 76811-59, 76821-59, 76825-59) without separate time entries or distinct clinical indications in chart. Audit finding: Bundling override flags as unbundling. Defense: Segregate each imaging service into separate clinical note with unique problem/question, not a single 'ultrasound order' with multiple codes.
Commercial payer pattern: Denial of modifier 25 appended to E/M when same physician performs imaging interpretation. Many payers deem imaging interpretation inherent to E/M work. Defense: Document separate, sustained history and assessment (e.g., risk stratification, patient counseling, management plan changes) in E/M note distinct from imaging report interpretation.
Payer-specific billing notes
Where the major payers diverge from generic Medicare rules in Maternal-Fetal Medicine.
ME Medicare +
LCD varies by MAC; most MACs do not have specific LCD for 59025 (NST) or advanced fetal imaging, relying on CMS global CPT definitions. Prior authorization not typically required for 76805-76828 imaging unless part of advanced care program. 2026 update: CMS added bundling clarification that 76818 (BPP with NST) globally includes 59025; do not separately report. Modifier 59 permitted only if NST performed at separate encounter date with distinct clinical rationale.
UN UnitedHealthcare +
Optum Maternal Fetal Medicine delegates imaging pre-auth to radiology networks in most regions; 76825 (fetal echo) and 59070-59076 (interventional procedures) typically require prior authorization. Medical policy requires that advanced Doppler (76821, 76820) include documented fetal anomaly or IUGR diagnosis. Modifier 59 accepted when documented in separate encounter note; same-day unbundling of 76818 and 59025 denied without external clinical evidence.
AN Anthem +
ICR/AIM system flags multiple ultrasound codes same date; requires concurrent surgical or E/M code for justification. Anthem medical policy requires ACOG guideline concordance for advanced imaging (no 76825 without documented or suspected cardiac anomaly). Modifier 25 on E/M requires documentation of separate history and plan, not just imaging interpretation. Prior auth not mandated but claims frequently audited post-payment; maintain clear clinical notes.
CI Cigna +
eviCore radiology delegation applies to some Cigna plans; fetal imaging >18 weeks may require eviCore pre-cert. Cigna medical policy aligns with ACOG Level I/II ultrasound definitions; Level III/IV imaging (fetal echo, advanced Doppler) requires clinical indication documentation. Modifier 59 accepted but Cigna audits for frequency; more than 3 ultrasounds per trimester flagged for medical review. No specific modifier 25 restriction, but concurrent E/M must be medically necessary separate service.
Standard Maternal-Fetal Medicine coding workflow
Step 1: Confirm gestational age (LMP, dating scan, or dating criteria per AMA CPT definitions) and document in chart before selecting ultrasound code. Step 2: Identify clinical indication (anatomy, Doppler, biophysical profile, cardiac evaluation, follow-up) and enter into imaging order with clinical question. Step 3: Obtain final ultrasound report with physician signature, fetal count, measurements, and interpretation within 24 hours. Step 4: Count distinct imaging services; assign primary code (76811 for detailed, 76805 for standard, 76818 for BPP with NST, 76821 for MCA Doppler, etc.), add-on codes for additional fetuses, and modifier 59 only if separate clinical purpose with separate documentation. Step 5: Attach E/M only with modifier 25 if separately documented medically necessary history, exam, and assessment distinct from imaging service work.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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