Which OB/GYN Procedures Typically Require Prior Authorization?

Authorization denials are among the most frustrating in OB/GYN billing because the care was appropriate, documented and often approved in principle — but a required step was missed, or the approved code didn't match what was billed. This reference covers the services most likely to need prior authorization and how to build a process that prevents CO-197 denials.

Requirements vary by payer, plan and state, and they change. Always verify with the specific plan before the service.

Surgical procedures

The CPT match matters. If the authorization lists 58570 and pathology confirms a 300 g uterus, the billed code becomes 58572 — which may not be covered by the authorization. When imaging suggests a large uterus, request authorization for the higher-tier code or both, per payer rules. If adnexal removal is added intraoperatively, update the authorization promptly.

Infertility treatment

• Ovulation induction monitoring, IUI and IVF frequently require authorization when they're covered at all
• Fertility benefit managers often run their own authorization process
• Fertility preservation before cancer treatment may need urgent authorization — many plans have expedited review

See infertility & REI billing and our IUI and IVF CPT codes reference.

Advanced imaging

• Pelvic MRI and CT are commonly managed by radiology benefit managers
• Fetal MRI may require authorization
• Routine obstetric ultrasound usually doesn't need authorization, but payers limit frequency; additional studies need documented indications

Genetic and prenatal testing

Cell-free DNA screening, carrier screening and diagnostic genetic tests often have coverage criteria and may require authorization or a laboratory benefit manager review. The ordering practice and the laboratory should coordinate on who obtains authorization.

Injectable medications

Office-administered drugs — for example, certain hormonal treatments or iron infusions — may require authorization under the medical benefit, or may need to be obtained through the pharmacy benefit instead. Confirm the benefit before ordering.

Obstetric notifications

Some Medicaid programs and managed care plans require pregnancy notification early in prenatal care, and some require authorization or notification for hospital admission for delivery. Missing a notification can affect payment for the obstetric package. See global maternity billing by payer.

Building an authorization checklist by payer

1. List your top payers and the services you perform most.
2. Record each payer's requirements — which codes, what documentation, submission method, turnaround time, validity period.
3. Build it into scheduling so surgical and imaging bookings trigger an authorization check automatically.
4. Track every authorization — number, approved codes and units, date range, facility.
5. Match authorization to claim before submission.
6. Plan for changes — know each payer's window for post-procedure updates.

What to include in an authorization request

• Diagnosis codes and clinical indication
• Relevant history: symptoms, duration, prior treatments and their results
• Imaging and lab results
• Planned procedure codes and setting (office, ASC, hospital)
• Provider and facility NPIs

Complete requests get decisions faster. Incomplete ones generate requests for information that delay surgery.

When authorization is denied

• Request a peer-to-peer review when the payer offers one
• Submit additional documentation addressing the specific criteria not met
• Appeal formally if needed
• Discuss options with the patient, including financial responsibility, before proceeding without authorization

Key takeaways

• Surgery, infertility, advanced imaging, genetic testing and injectables are the most common OB/GYN authorization categories.
• Authorization must match the billed CPT code — plan for weight tiers and intraoperative changes.
• A payer-specific checklist built into scheduling prevents most CO-197 denials.

A sample authorization workflow

1. Scheduling: when a procedure is booked, the scheduler records the planned CPT codes, facility, date and payer.
2. Requirement check: the verification team checks the payer's authorization list for those codes and that setting.
3. Request: if required, the request is submitted with clinical notes, imaging and prior treatment history.
4. Tracking: the request is logged with a follow-up date; the surgery date is protected until approval.
5. Decision: approval details (number, codes, units, dates) are recorded in the patient's account; denials go to peer-to-peer or appeal.
6. Day of surgery: the team confirms the authorization is still valid for the date and codes.
7. After surgery: if the procedure changed, an update is requested within the payer's window before the claim is submitted.

Common authorization mistakes

• Assuming that a payer that didn't require authorization last year doesn't require it now
• Getting authorization for the surgeon but not the facility (or vice versa) when both are required
• Letting authorizations expire when surgery is rescheduled
• Authorizing a diagnostic procedure that becomes therapeutic during the case
• Not checking whether the patient's plan uses a separate benefit manager for imaging or fertility

Get help with authorizations

Our eligibility verification team handles benefit checks and prior authorizations for OB/GYN practices, matched to planned procedure codes. Send us a WhatsApp message for a free review of your authorization denials.