CPT Code 99358: Prolonged E/M Service Before and/or After Direct Patient Care, First Hour

Learn about CPT Code 99358 for prolonged E/M services before or after patient care. Understand its use, requirements, and billing guidelines in this guide.

Use Code

Frequently asked questions

No. CPT 99358 applies to prolonged services performed on a separate date from the face-to-face E/M service, while 99417 is for additional time on the same day as the office visit.

You must spend at least 31 minutes of non-face-to-face time on the service. If the time is below this threshold, the service cannot be reported under 99358.

No. CPT 99358 must be personally performed by a physician or other qualified healthcare professional. Time spent by staff does not count toward the time required for billing this code.