CPT 99458 is an add-on code that allows maternity care teams to bill for each additional 20 minutes of remote patient monitoring (RPM) time beyond the initial 20 minutes covered by CPT 99457. This is especially valuable in high-touch maternity care environments, where care teams often spend extended time reviewing physiological data, responding to patient concerns, and adjusting care plans.

For OB/GYN practices and prenatal programs managing high-risk pregnancies, social risk factors, or postpartum transitions, 99458 enables providers to deliver personalized while maintaining a strong ROI. It ensures that every meaningful moment of care, beyond the first 20 minutes, is recognized and reimbursed.

What Does CPT 99458 Cover?

  • Each additional 20-minute increment spent on RPM services in a calendar month
  • Activities include data analysis, clinical decision-making, care coordination, and interactive communication with the patient or caregiver
  • Must be billed in conjunction with 99457, which covers the initial 20 minutes
  • Up to two units of 99458 may be billed per patient per month (for a maximum of 60 minutes)

2025 National Average Reimbursement

  • CPT 99458: $38.49 per patient per month
  • Billable once per month per patient
  • Can be paired with 99457

Why 99458 Matters for Maternity Providers

  • High-risk patients such as those with gestational diabetes, hypertension, or behavioral health concerns often require 40–60+ minutes/month of management.
  • Postpartum patients benefit from extended remote engagement during a critical window when clinical touchpoints are historically low.
  • Clinics can optimize revenue and prevent staff burnout by billing for time already being spent delivering care.

Compliance and Documentation Requirements

To bill CPT 99458:

  • Providers must already bill CPT 99457 in the same month.
  • Must document a minimum of 20 minutes per unit beyond the first 20 minutes (e.g., 99457 + 99458 = 40+ minutes).
  • A real-time patient interaction is still required each month (phone or video).
  • Services must be delivered by qualified providers or supervised staff.

How 99458 Aligns with National Guidelines

  • American College of Obstetricians and Gynecologists (ACOG): Endorses the use of remote monitoring to extend prenatal care and reduce disparities in access.
  • USPSTF: Recommends regular monitoring of maternal blood pressure, glucose, and weight to prevent perinatal complications.
  • NCQA/HEDIS: Supports remote management as a method to meet timeliness of prenatal care, postpartum follow-up, and blood pressure control measures.
  • AMA: Advocates for digital tools like RPM to support maternity care management, shared decision-making, and equity in care access.
  • AIM Patient Safety Bundles: by enabling continuous remote monitoring of vital signs and symptoms for early identification and timely response to conditions like hypertension
  • MiPATH recommendations by facilitating personalized, data-driven prenatal care through remote monitoring

Best Practices for CPT 99458 in Maternity Care

  • Track time spent across the care team, not just physicians
  • Bill 99458 only after logging the first 20 minutes under 99457
  • Build RPM into your prenatal and postpartum pathways so every patient interaction counts

How Marani Helps Clinics Maximize CPT 99458

Marani delivers a configurable, maternity-focused RPM platform that enables OB/GYN practices to capture the full value of time spent caring for pregnant and postpartum patients.

With Marani, you get:

  • Built-in patient communication tools to meet the real-time interaction requirement
  • Clinical alerts and escalations tailored to maternity risk factors (e.g., BP spikes, abnormal weight gain)
  • Custom workflows and documentation that align with CPT billing standards
  • Dashboard-level insights into quality performance, compliance, and HEDIS measure tracking
  • Attractive pricing and support for clinics of all sizes, from solo OB/GYNs to large health systems

The Result:

Marani helps your team deliver high-quality, high-touch maternity care without sacrificing revenue or compliance. Whether you’re managing a patient with pre-eclampsia risk or helping a new mom monitor mental health at home, CPT 99458 ensures your work is supported and reimbursed.