If you work in a medical practice, a billing department, or as a coder, you already know that CPT code 99213 shows up on claims more than almost any other code. In fact, according to CMS data, this single code accounts for more than 25% of all outpatient evaluation and management claims billed to Medicare every year. That is a huge number. And yet, despite how common it is, mistakes with this code still trigger audits, cause claim denials, and cost practices real money.
So whether you are new to medical billing or you have been doing this for years, this guide breaks down everything you need to know about CPT 99213 in 2026 — from what it means and when to use it, to the latest reimbursement updates and the most common mistakes you need to avoid right now.
What Is CPT Code 99213?
CPT code 99213 is an evaluation and management (E/M) code that covers an office or outpatient visit for an established patient. The American Medical Association (AMA) classifies it as a Level 3 office visit, meaning it falls right in the middle of the E/M complexity scale — above a simple check-in but below a complex, high-stakes decision-making encounter.
In plain terms, 99213 covers visits where:
- The patient has already been seen at your practice within the past three years
- The visit involves low-complexity medical decision making (MDM), OR
- The provider spends a total of 20 to 29 minutes on the encounter on that date of service
It is one of the most recognized codes in all of outpatient medicine. Primary care physicians, internists, behavioral health providers, and specialists all rely on it daily. Essentially, it is the workhorse of follow-up billing.
What Does “Established Patient” Mean?
Before you even think about billing 99213, you need to confirm patient status. An established patient is someone who has received professional services from the same physician (or another physician of the same specialty in the same group practice) within the past three years.
If the patient is new — meaning they have never been seen or it has been more than three years — you must use a new patient code like 99203 or 99204 instead. Mixing these up is one of the top reasons for claim denials, and auditors check for this regularly.
When Should You Use CPT 99213?
You should reach for CPT 99213 when the visit matches either the time-based or the MDM-based criteria. Let’s walk through both paths.
Time-Based Billing
If you choose to code based on time, the total encounter time must fall between 20 and 29 minutes. Importantly, this is total time — not just face-to-face. It includes:
- Time spent reviewing prior records before the visit
- The actual exam and conversation with the patient
- Documentation, ordering tests, and coordinating care after the patient leaves (on the same calendar date)
You must document the total time clearly in the chart note. Writing “time spent” or a vague phrase will not hold up in an audit. You need a specific number, like “Total encounter time: 22 minutes.”
Medical Decision Making (MDM) Criteria
Since the 2021 E/M guideline overhaul, medical decision making is the primary method most coders and providers use. For 99213 to qualify under MDM, the visit must involve low-complexity decision making.
Low-complexity MDM means meeting 2 out of 3 of the following elements:
| MDM Element | What Qualifies for Low Complexity (99213) |
|---|---|
| Number and complexity of problems | One stable chronic illness OR one acute uncomplicated illness or injury |
| Amount and complexity of data reviewed | Ordering or reviewing one test; using results already available |
| Risk of complications or morbidity | Prescription drug management that is not high-risk; OTC drug management |
Common clinical scenarios that fit 99213 include a follow-up for well-controlled hypertension, a routine check-in for managed type 2 diabetes, evaluation of a mild respiratory infection, a skin condition follow-up, or medication refill with minor adjustment. These visits are real, they are common, and they deserve appropriate reimbursement when the documentation backs them up.
2026 Updates: What Changed and What Stayed the Same
Here is where things get interesting. The 2026 Medicare Physician Fee Schedule brought notable changes that every billing professional should understand right now.
Dual Conversion Factor System
For the first time, CMS introduced two separate conversion factors based on provider participation in Alternative Payment Models (APMs):
- Standard non-QP providers: $33.40 per RVU
- Qualifying APM Participants (QPs): $33.57 per RVU
This is the first physician payment increase since 2020, and it directly affects what practices earn per 99213 claim.
2026 Reimbursement Rates for CPT 99213
| Billing Setting | Total RVUs | Approximate Medicare Payment |
|---|---|---|
| Non-Facility (Office) | 2.75 | ~$91.85 |
| Facility (Hospital Outpatient) | 1.97 | ~$65.80 |
These are national averages using the standard non-QP conversion factor. Your actual payment varies based on your Geographic Practice Cost Index (GPCI). Practices in Manhattan or San Francisco will see higher rates; rural areas generally receive less. Always use the CMS Physician Fee Schedule Lookup Tool with your specific ZIP code to get your exact number.
Work RVU Stayed Constant
CMS considered revaluing E/M codes again in 2026 but ultimately left the work RVU for 99213 at 1.30. That consistency is good news for productivity modeling and contract negotiations.
Telehealth Is Now Permanent
Another major 2026 shift: Medicare telehealth codes, including 99213 when billed for telehealth encounters, moved from the temporary list to the permanent telehealth services list. Providers no longer need to worry about annual authorization sunset. As long as the clinical criteria are met and the correct modifier is applied (usually modifier -95 for audio-video or -93 for audio-only), you can bill 99213 for a qualifying telehealth visit.
99213 vs 99214: Know the Difference
The question that comes up constantly in billing audits and compliance reviews is: when does a visit cross the line from 99213 to 99214?
The key distinction is complexity level:
| Feature | CPT 99213 | CPT 99214 |
|---|---|---|
| MDM Level | Low | Moderate |
| Typical Patient Scenario | One stable chronic condition; minor acute problem | Two or more chronic conditions; one condition with exacerbation |
| Time Range | 20-29 minutes | 30-39 minutes |
| Medicare Payment (office) | ~$91.85 | ~$135-140 |
| Audit Risk When Misused | High | High |
A patient with two chronic conditions that are both stable often qualifies for moderate MDM, making 99214 the right call. However, reflexively defaulting to 99214 for every established patient visit is exactly what auditors flag. On the flip side, consistently using 99213 when the clinical picture supports 99214 is under-coding — and it leaves real money on the table.
99213 Documentation Requirements You Must Follow in 2026
Documentation is everything. You can see the right patient, make the right clinical decisions, and still lose your claim if the chart note does not support what you billed.
Here is what strong 99213 documentation looks like:
For MDM-based billing:
- Clearly identify the problem being addressed and its status (stable, worsening, new, etc.)
- Specify what data you reviewed: “Reviewed CBC from June 10, 2026 showing WBC 6.2”
- Document the risk level: “Continued current antihypertensive regimen; low risk”
For time-based billing:
- State the total encounter time explicitly: “Total encounter time: 24 minutes”
- You do not need to break down every minute, but the note must show it was primarily driven by time
Template language that gets you in trouble:
- “Reviewed labs” (too vague)
- “Patient doing well” (no problem detail)
- Copy-paste notes from previous visits without updates
Auditors specifically look for identical language across patient encounters. That pattern signals templating, and it triggers automatic flags in most payer audit systems.
CPT 99213 with Modifier 25: The Rules
One of the most searched and most misunderstood billing scenarios involves CPT 99213 with modifier 25. So let’s clear this up.
Modifier 25 signals to the payer that the E/M service on the same date was significant, separately identifiable, and above the work associated with another procedure or service performed that day. For example, if a patient comes in for a wart removal (a minor procedure) and the provider also addresses a separate, distinct problem during the same visit, you can append modifier 25 to the 99213.
The critical rule: the E/M must be truly separate from the procedure. It cannot be just a quick pre-procedure check. The documentation must support an independent evaluation that would have occurred regardless of the procedure.
Overuse of modifier 25 is one of the top audit triggers in outpatient billing. CMS and commercial payers routinely run reports to flag practices that append it on nearly every claim.
Related CPT Codes to Know
Understanding CPT 99213 also means knowing the codes around it. Here is a quick reference to the established patient E/M family:
| CPT Code | Description | MDM Level | Time |
|---|---|---|---|
| 99211 | Established patient, minimal | N/A (may not require physician) | 5-10 min |
| 99212 | Established patient, straightforward | Straightforward | 10-19 min |
| 99213 | Established patient, low complexity | Low | 20-29 min |
| 99214 | Established patient, moderate complexity | Moderate | 30-39 min |
| 99215 | Established patient, high complexity | High | 40-54 min |
Choosing the wrong code from this family — especially going from 99213 to 99214 without documentation to support it — is the single biggest compliance risk in outpatient E/M billing.
Common Mistakes That Lead to 99213 Claim Denials
Because 99213 is the most frequently billed E/M code for established patients, it is also the most heavily audited. Here are the mistakes that trip practices up the most, along with how to fix them.
Mistake 1: Vague problem documentation Saying “chronic condition managed” tells the payer nothing. Write specifically: “Type 2 diabetes, HbA1c 7.1, stable on current regimen.”
Mistake 2: Missing time documentation when billing by time If you choose the time-based path, state the total encounter time clearly in your note. Without it, the claim defaults to MDM review — and if that does not hold up, you get a denial.
Mistake 3: Using 99213 when the visit qualifies for 99214 This is under-coding. When a patient presents with two stable chronic conditions plus a new acute complaint, that visit likely meets moderate MDM criteria. Review each encounter individually.
Mistake 4: Billing 99213 for a new patient New patients must use 99202-99205. Using 99213 for a first visit is a straightforward error that payers catch immediately through eligibility verification.
Mistake 5: Copy-paste documentation across visits Identical note language for multiple patients or the same patient across dates is one of the top audit red flags. Always personalize the assessment and plan.
Mistake 6: Inappropriate modifier 25 use Only append modifier 25 when the E/M is truly separate and independently documented from a same-day procedure. Routine procedure preparation does not qualify.
99213 RVU Value: What You Need to Know
For providers working under productivity-based compensation models, the 99213 RVU value is a number that comes up constantly. Here is a clear breakdown:
- Work RVU (wRVU): 1.30
- Practice Expense RVU (non-facility): approximately 1.37
- Malpractice RVU: approximately 0.08
- Total RVU (non-facility): approximately 2.75
The work RVU of 1.30 is actually the foundational value of the entire Resource-Based Relative Value Scale (RBRVS). The 99213 was used as the benchmark code when CMS first built the RBRVS system, which is part of why this code carries such historical and operational significance.
Frequently Asked Questions
What is CPT code 99213 used for? It covers a standard follow-up office visit for an established patient involving low-complexity medical decision making or 20-29 minutes of total encounter time.
How much does Medicare pay for CPT 99213 in 2026? The national average Medicare reimbursement is approximately $91.85 for a non-facility (office) visit, based on the 2026 conversion factor of $33.40.
Can you bill 99213 for a telehealth visit? Yes. In 2026, CPT 99213 is on the permanent Medicare telehealth list. Use modifier -95 for audio-video encounters and modifier -93 for audio-only visits.
What is the difference between 99213 and 99214? 99213 requires low-complexity MDM or 20-29 minutes. 99214 requires moderate-complexity MDM or 30-39 minutes. The documentation must clearly support whichever level you choose.
Can you use modifier 25 with 99213? Yes, but only when the E/M service is significant, separately identifiable, and performed on the same day as a distinct procedure. The documentation must fully support both services independently.
What causes 99213 claim denials? The most common reasons include vague documentation, patient status errors (billing 99213 for new patients), unsupported modifier 25 usage, and coding 99213 when 99214 is clinically appropriate.
How long does a 99213 visit need to be? If billing by time, total encounter time must be 20-29 minutes. If billing by MDM, time is not the determining factor — complexity is.
What is the RVU for 99213? The work RVU is 1.30. Total RVUs in a non-facility setting are approximately 2.75 in 2026.
Final Thoughts
CPT code 99213 is not complicated once you understand the framework behind it. The key is choosing the right path — MDM or time — and then backing up your choice with documentation that clearly supports the level you selected. In 2026, the rules have not changed dramatically, but the stakes have. With increased Medicare audit activity, a dual conversion factor system, and growing payer scrutiny on E/M patterns, billing 99213 correctly every single time is not optional. It is essential.
Take time to review your practice’s 99213 distribution. If nearly every established patient visit comes out as a 99213, that pattern draws attention. Conversely, if you are almost never billing 99214 for complex visits, you are likely leaving money on the table. The goal is accurate coding — not up-coding, not down-coding, but getting it right.
And when in doubt, document more, not less.
