If there’s one CPT code that shows up in nearly every primary care and outpatient practice, it’s CPT Code 99213. It’s the middle-of-the-road office visit code not too simple, not too complex and for a lot of practices, it’s the code they bill more than any other.
It’s also one of the codes that gets undercoded, overcoded, denied, and audited more than almost anything else in the fee schedule.
Here’s the truth about 99213: most providers have a general sense of when to use it, but very few have sat down to really understand what the documentation should look like and what happens when it doesn’t. That gray area costs practices real money, whether it’s through downcoded claims, denied visits, or worse, audit exposure.
This guide gives you the full picture of the 99213 requirements, proper documentation, how much it pays, and what common mistakes to avoid immediately.
What is the CPT code 99213?
The 99213 is an E/M billing code that bills a visit of an established patient in an office/outpatient setting. The CPT Code 99213 is a relatively low-to moderately complex case in which a patient visits your office for a simple problem, you evaluate the patient, decide on a treatment option, and discharge him from your office.
Think of a patient coming in for a follow-up on a controlled chronic condition. A sinus infection that needs assessment. A medication check for a stable patient. An established patient with a minor acute complaint. That is the range for code 99213.
It falls right in the center of the entire patient E/M coding structure that ranges from 99211 (the least complicated, usually done only by nurses) all the way to 99215 (the most complex E/M services, requiring substantial decision-making on the part of the doctor). When you should actually be billing 99214 instead.
The 2026 documentation requirements for CPT 99213
This is where a lot of practices get into trouble. Since CMS overhauled E&M documentation guidelines in 2021, the rules for office visit coding have shifted significantly and some providers are still documenting the old way without realizing it.
Under current guidelines, there are two ways to support your level of service for cpt code 99213. You can use total time, or you can use medical decision-making. The old three-component system history, exam, and medical decision-making is no longer required for office visits. That’s a big deal that’s still not fully understood by every provider.
Option 1: Medical decision-making (MDM)
To support 99213 using MDM, your documentation needs to reflect low complexity medical decision-making. That means meeting at least two out of three of the following elements:
Number and complexity of problems addressed. For CPT Code 99213, this means one self-limited or minor problem, or one stable chronic illness. A patient coming in for a blood pressure check on a well-controlled medication fits here. A patient with two or three chronic conditions that need active management is probably a 99214.
Amount and complexity of data reviewed and ordered. At the low complexity level for CPT Code 99213, you might be reviewing results from an external source, ordering a test, or independently interpreting a result you ordered. You don’t need an extensive data review but it needs to be documented if it happened.
Risk of complications and morbidity. For 99213, this typically means over-the-counter medications or minor prescription drug management with minimal risk. If you’re managing a prescription that requires monitoring, or there’s a meaningful risk involved in the treatment decision, that’s pointing toward 99214.
The key thing here is documentation. It’s not enough to have done the clinical work. The note has to actually reflect what you assessed, what you ordered or reviewed, and what your plan was with enough detail that someone reading it later can verify the level of complexity.
Option 2: Total time
The time-based option can be simpler and more confusing than one might think. In 2026, for cpt code 99213, the total time requirement will be 20 to 29 minutes during the encounter. It includes the time required for all activities related to that encounter on the same day, which involves record review before the encounter, the encounter, test orders, documentation, and coordination of care.
What it does not include is time spent on separate encounters that day, time spent on work that falls under a separately billable service, or time spent by clinical staff that the provider didn’t supervise or participate in. In case you are charging based on time, your chart notes must indicate the total amount of time taken and what tasks were accomplished during that period. General statements such as “Thirty minutes spent with the patient” will not suffice any longer. Make sure to be clear regarding what you have done.
CPT 99213 vs 99214
The most common issue for many practices is figuring out which code should be used between these two codes. The fact remains that many physicians are billing 99213 when in actuality their clinical efforts justify the use of the 99214 code. Consider the following approach.
If the patient has only one condition under control and checking his/her blood pressure along with making sure the medication is working fine and he/she does not have anything new to complain of that’s cpt code 99213.
If the patient has two or more chronic conditions, or one condition that isn’t well-controlled, or they’ve come in with a new problem that requires meaningful clinical judgment to evaluate and manage that’s almost certainly 99214.
The mistake most practices make is defaulting to 99213 out of habit or caution, even when the documentation clearly supports a higher level of service. This is called undercoding, and it’s just as much a compliance issue as overcoding. You’re not accurately representing the work you did, and you’re leaving money on the table every single time.
A quick internal audit of your 99213 claims against the actual notes is often eye-opening. Many practices find that 20 to 30 percent of their 99213 visits should have been billed as 99214.
Common denial reasons for CPT Code 99213 and how to fix them
Getting 99213 denied is frustrating, especially when you know the visit was real and the work was done. Here are the most common reasons it happens and what to do about each one.
Documentation doesn’t support the level billed. This is the most common denial in E&M audits. The note is too thin it doesn’t clearly reflect the complexity of the visit. The fix is documentation improvement, not just resubmission. If you’re getting this denial repeatedly, it’s worth sitting down with your billing team and reviewing what the notes actually look like.
Modifier 25 is missing when billing with a procedure. If you performed a procedure on the same day as the office visit an injection, a removal, or a minor procedure and you’re billing both the E&M and the procedure, modifier 25 is required on the cpt code 99213. Without it, the payer will bundle the E&M into the procedure payment and you’ll lose the office visit reimbursement entirely.
Established patient billed as a new patient. This sounds obvious but it happens more than you’d think, especially in practices with multiple locations or providers. An established patient in your system who sees a different provider for the first time doesn’t automatically become a new patient under CPT guidelines. Know the three-year rule. if the patient has been seen by the same practice within the last three years, they’re established.
Wrong place of service code. The reimbursement and documentation requirements differ between office visits (POS 11) and outpatient hospital visits (POS 22). Using the wrong place of service is a quick path to a denial or an underpayment.
Frequency limitations exceeded. Some payers have limits on how many times particular E&M codes can be used during a specific time frame. If you are seeing patients more often and billing 99213 on each visit, expect some payers to audit it. Ensure your notes indicate reasons for every visit being medically necessary.
FAQs
Can you bill 99213 for a telehealth encounter in 2026?
Yes. Telehealth encounters via audio-video can be coded using CPT Code 99213 with the telehealth modifier (modifier 95 for synchronous audio-video services). The place of service code 02 is assigned for telehealth encounters that occur somewhere other than a patient’s residence. POS code 10 is assigned when telehealth encounters take place in the patient’s residence.
How do 99213 and 99212 differ?
CPT 99212 is lower complexity compared to CPT 99213. A self-limited issue requiring less clinical decision making (about 10-19 minutes of total time). In most cases, the criterion for billing 99212 is too low, and most of the encounters should be reported with code 99213. It is advisable to check whether the encounters that you bill 99212 actually satisfy the criteria for billing CPT Code 99213.
Does CPT Code 99213 require a PE?
Physical Exam (PE) is not a required component for E&M coding under 2021+ guidelines. However, if you performed an exam, document it. It supports your clinical note and can provide context for your medical decision-making. Omitting an exam you actually performed is also a poor documentation practice regardless of billing requirements.
Can a nurse practitioner or PA bill 99213?
Yes. Nurse practitioners and physician assistants who are credentialed and enrolled with payers can bill 99213 under their own NPI. Under Medicare’s “incident to” rules, an NP or PA can also bill under the supervising physician’s NPI in certain circumstances but the incident-to requirements are specific and must be met carefully to avoid compliance issues.
Getting 99213 right is not just about compliance it’s about revenue
CPT code 99213 is probably one of the most common codes in your practice. Getting it right documenting it properly, billing it at the correct level, catching denials before they age has a direct impact on your bottom line every single month.
Most practices aren’t losing money on 99213 through fraud or intentional errors. They’re losing it through undercoding, through denials that don’t get worked, through modifier 25 mistakes that quietly bundle away office visit revenue, and through notes that don’t support what was actually done clinically. Professional Billing Support includes accurate CPT 99213 coding, modifier usage when required, insurance verification, claim submission, and denial management.
At Med Bridge LLC, we review E&M coding as part of every billing engagement. If you’re not sure whether your 99213 claims are being coded and documented correctly or if you’re seeing a higher denial rate than you’d expect. We’d be glad to take a look.
