Provider Actions — Coverage, Authorization, and Documentation

Providers must follow coverage limits, coding, authorization, and documentation requirements when ordering and billing ultrasound exams in pregnancy. The rules below summarize allowed exam types and frequencies, required CPT usage, prior authorization and regulatory review expectations, diagnosis code support for detailed anatomic ultrasound (76811), and documentation and coding guidance to support medical necessity. Failure to adhere to these requirements may result in claim denial or request for additional information.

• Coverage limits and CPT codes: One standard first-trimester ultrasound per pregnancy (CPT 76801) and one standard second/third-trimester ultrasound per pregnancy (CPT 76805) are allowed. One detailed anatomic ultrasound (CPT 76811) is allowed per pregnancy when indicated. Transvaginal ultrasound CPTs (e.g., 76817) are allowed per clinical indications. Follow-up or focused assessments use CPT 76815/76816 as appropriate.
• Frequency/Timing and authorization: Verify allowable frequencies and timing prior to scheduling. For TVU cervical length screening follow Table 1 timing and maximums (up to 13 TVUs per pregnancy in office settings when criteria met). Additional standard second/third trimester ultrasound may be allowed when care is transferred to a new provider. Subsequent standard or detailed ultrasounds beyond allowed numbers generally require documentation of extenuating circumstances and may require prior authorization.
• Prior authorization and regulatory review: Review and comply with plan-specific prior authorization requirements. For Medicare members, review applicable NCDs, LCDs, and Medicare Coverage Articles; for Medicaid, consult the state Medicaid manual. Confirm whether a prior authorization is required before performing additional or atypical exams.
• Diagnosis code support for CPT 76811: Claims for the first detailed fetal anatomic ultrasound (76811) must be billed with an appropriate high-risk diagnosis code from the policy's Table 4 (e.g., listed O35.x ranges, selected maternal/systemic diagnosis ranges such as A92.5; hematologic, rheumatologic, renal codes; selected obstetric complications). Absence of one of the listed supporting diagnosis codes on the claim may not meet medical necessity for CPT 76811.
• Coverage decisions and administration: Coverage determinations are subject to the member's plan terms, exclusions, and limitations, and to state and federal requirements. This policy is a guide to medical necessity and not a guarantee of payment.
• Documentation and coding guidance: Document the clinical indication(s) clearly in the medical record, including gestational age, specific reason for the exam, prior imaging findings prompting the study, and any findings addressed. Use current CPT descriptors and accurate ICD-10 diagnosis codes. Reference up-to-date professional coding guidance before claim submission. Inclusion or exclusion of codes in the policy does not guarantee coverage.
• Provider documentation alignment: Providers should document indications and medical necessity consistent with this policy and applicable state/Medicare rules. Required clinical documentation may include prior preterm birth history, cervical length measurements and monitoring plan, transfer-of-care status, details supporting need for a detailed anatomic exam, and rationale for follow-up scans. Maintain imaging reports and measurements supportive of billed CPT codes.
• Potential denial triggers: Subsequent standard first- or second/third-trimester ultrasounds beyond the allowed single exam per pregnancy (76801 or 76805) without documented medical necessity, repeat detailed anatomic ultrasounds (76811) without listed extenuating circumstances or appropriate diagnosis codes, scans performed solely for fetal sex or keepsake images, scans for growth evaluation performed <2 weeks apart, or ultrasounds to confirm pregnancy absent other indications are examples of services likely to be considered not medically necessary.