Billing and Coding for Nurse Practitioners: Office E/M Coding Guide

Billing and coding can be one of the MOST confusing parts of starting practice as a new nurse practitioner. What’s the difference between a 99213 and 99214? How do you figure out the right E/M code for an office visit? And how do you make sure your documentation supports the work you’re doing?

I created this episode in 2020 to make office visit E/M coding easier to understand, and it has since become one of the most-watched Real World NP videos. It’s also used by many NP programs across the country to help teach students the foundations of billing and coding.

In the episode, I break down the basic concepts behind office visit E/M coding and walk through primary care patient examples so you can start to see how the pieces fit together.

2026 Update: The foundational concepts in this classic Real World NP episode are still helpful for understanding office visit E/M coding, but the guidelines for selecting and documenting office/outpatient E/M services have changed since it was recorded.

I published a follow-up in 2021 when major E/M changes took effect, and I’m currently working on a new episode that brings everything together with current guidance. You can still watch the original episode below to learn the foundational concepts and see the patient examples, followed by the 2021 update.

For current guidance you can use in practice, download the updated Office Visit E/M Coding Cheat Sheet here.It’s also included in the Digital NP Binder.


Listen - Original Episode + 2021 Update | Listen 0:00–7:45 only → Then listen to the 2021 update

Watch - Original Episode + 2021 Update | Watch 0:00–7:45 only → Then watch the 2021 update


What I Cover in These Episodes:

In the original episode (watch/listen through 7:45):

  • The basics of office visit E/M coding in primary care

  • The difference between new and established patient visits

  • How the common office visit E/M codes are organized

  • The concept of medical decision making (MDM) and how patient complexity relates to coding

  • Why practicing with real patient examples can make billing and coding easier to understand

Then, in the 2021 update:

  • The major changes to office/outpatient E/M coding that took effect in 2021

  • Choosing an E/M level based on medical decision-making or total time

  • What work can count toward total time on the date of the encounter

  • The change to history and physical exam requirements—they should be medically appropriate rather than used to determine the E/M level

  • Additional changes, including the removal of 99201 and a brief introduction to prolonged services and the primary care add-on code that was new at the time

Key Takeaways

Office Visit E/M Codes Can Be Selected by MDM or Time

For most office/outpatient E/M visits, you can select the level based on either medical decision making (MDM) or total time on the date of the encounter. You don’t have to meet both.

MDM Is Based on 3 Elements

When coding based on medical decision making, look at:

  • Problems addressed

  • Amount and/or complexity of data reviewed and analyzed

  • Risk of patient management

You need to meet the requirements for 2 out of these 3 elements to support a particular level of MDM.

History and Physical Exam Don't Determine the E/M Level

You no longer need a certain number of HPI elements, ROS systems, or physical exam elements to qualify for a 99213 or 99214. Perform and document a medically appropriate history and/or exam based on the patient's care.

Time Includes More Than Face-to-Face Time

When coding based on time, qualifying work you personally perform on the date of the encounter can count—not just the minutes you spend in the exam room. This can include reviewing records, documenting, ordering tests or medications, counseling, and care coordination related to the encounter.

Don't Automatically Downcode Your Visits

A common mistake is assuming a routine primary care follow-up must be a 99213. Look at the actual problems you addressed, data you reviewed/analyzed, and management risk before choosing the code. A visit may meet moderate MDM even when it doesn't feel particularly complicated.


Want to keep the current coding criteria handy?

Download the free Billing & Coding Cheat Sheet to quickly work through office visit E/M coding in practice.

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Click Here for Your Billing & Coding Cheat Sheet

Updated for 2026! Make a confusing real-world skill simpler and easier with this Billing & Coding Cheat Sheet for Nurse Practitioners. PLUS you'll get helpful articles, podcasts, and YT video episodes sent to your inbox every week or so.

© 2026 Real World NP. For educational and informational purposes only, see realworldnp.com/disclaimer for full details.

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