If you work in medical billing or clinical practice, you have seen CPT 99213 on countless claims. It is the most frequently billed evaluation and management (E/M) code for established patients in outpatient settings. But despite its everyday use, it is also one of the most misused and audited codes.
Billing 99213 incorrectly can lead to downcoding, revenue loss, and even compliance audits. On the other hand, undercoding – using 99213 when a higher level like 99214 is justified – leaves significant money on the table. Getting it right matters for your practice’s financial health.
In this guide, you will learn exactly what CPT 99213 represents, how to apply the 2021+ guidelines for medical decision making (MDM) and time-based coding, what documentation auditors look for, and how to avoid common billing errors that trigger denials.
What Is CPT Code 99213? (Simple Definition)
CPT 99213 is an E/M code used for an office or other outpatient visit for an established patient. It describes a visit that requires a medically appropriate history and/or examination and a low level of medical decision making (MDM).
Since the 2021 E/M guideline changes, CPT 99213 can be selected using either MDM or total time on the date of service. You do not need both – choose whichever better reflects the encounter and is supported by your documentation.
Code Descriptor (2026):
Office or other outpatient visit for the evaluation and management of an established patient, which requires a medically appropriate history and/or examination and a low level of medical decision making.
When using time, CPT 99213 corresponds to 20–29 minutes of total provider time on the date of the encounter.
Typical uses include:
- Follow-up for stable chronic conditions (e.g., controlled hypertension, stable diabetes)
- Uncomplicated acute illnesses (e.g., sinus infection, mild UTI, conjunctivitis)
- Medication refill visits with low-risk adjustments
In short, CPT 99213 is the “workhorse” code for routine follow-up visits that are more involved than a brief 99212 but do not reach the moderate complexity of 99214.
Established Patient Definition (Crucial First Step)
Before you even consider the level of service, you must confirm the patient is established.
A patient is considered established if they have received professional services from the same provider (or another provider of the same specialty in the same group) within the past three years.
If the patient does not meet this definition, they are new and belong in the 99202–99205 range. No matter how “99213-ish” the visit feels, you cannot bill 99213 for a new patient.
Two Paths to Bill CPT 99213
Under the 2021+ AMA and CMS E/M guidelines, you can select 99213 using either:
- Medical Decision Making (MDM) – Document low complexity across three elements, or
- Total Time – Document 20–29 minutes of total provider time on the date of service.
You choose whichever path best reflects the encounter. Most providers use MDM, but time-based coding is valuable for counseling-heavy visits.
Path 1: Low Complexity Medical Decision Making (MDM)
MDM is the most common method for selecting 99213. The level must be low. To qualify, the encounter must meet two of three elements at the low complexity level.
| MDM Element | Low Complexity (99213) Requirements |
| Number and Complexity of Problems Addressed | Two or more self-limited or minor problems, OR one stable chronic illness, OR one acute, uncomplicated illness or injury |
| Amount and/or Complexity of Data Reviewed | At least one: review of prior external note(s), review of test result(s), or ordering of test(s) |
| Risk of Complications and/or Morbidity or Mortality | Low risk of morbidity from additional diagnostic testing or treatment |
Clinical Examples by Element
Problems Addressed (Element 1):
- A stable chronic condition (e.g., controlled hypertension, diabetes at goal)
- One acute, uncomplicated illness (e.g., sinus infection, mild rash, simple UTI)
- Two minor, self-limited complaints (e.g., seasonal allergies and mild insomnia)
Data Reviewed (Element 2):
- Checking one or two lab results (e.g., CBC, BMP)
- Reviewing a recent imaging report
- Ordering routine tests (e.g., urinalysis, basic metabolic panel)
Risk (Element 3):
- Renewing or slightly adjusting a long-term medication
- Starting a simple short-term prescription (e.g., antibiotic for UTI)
- Over-the-counter drug recommendation
- Physical or occupational therapy
- IV fluids without additives
Key Rule: The encounter must meet or exceed two of the three elements at the low complexity level. For example, if the problems are low complexity and the risk is low, you qualify even if data reviewed is minimal.
Path 2: Time-Based Coding (20–29 Minutes)
Alternatively, you can select 99213 based on total time spent by the provider on the date of service. Under the 2021+ guidelines, time includes all provider activities on the date of the encounter, both face-to-face and non‑face-to-face.
| Code | Time Range | Notes |
| 99211 | 1–9 minutes | Non‑physician work; time not used |
| 99212 | 10–19 minutes | Straightforward MDM |
| 99213 | 20–29 minutes | Low MDM |
| 99214 | 30–39 minutes | Moderate MDM |
| 99215 | 40–54 minutes | High MDM |
Included in total time:
- Reviewing the chart and test results before the visit
- Taking history and performing examination
- Counseling the patient or family
- Ordering or interpreting tests
- Documenting the encounter
- Coordinating care with other providers
Excluded from total time:
- Time spent on separately billable procedures (e.g., a minor procedure with modifier -25)
- Travel time
- General teaching not specific to the patient’s management
Documentation Tip: When billing by time, document the total minutes and specify the activities included. For example:
“Total time: 25 minutes including chart review, history, exam, counseling on medication adherence, and documentation.”
CPT 99213 vs. Other E/M Codes: Quick Comparison
Understanding how 99213 differs from adjacent codes is essential for accurate billing and preventing downcoding or upcoding.
| Code | MDM Level | Time Range | Typical Encounter |
| 99212 | Straightforward | 10–19 minutes | Brief, minimal visit; one self-limited problem |
| 99213 | Low | 20–29 minutes | Stable chronic or uncomplicated acute |
| 99214 | Moderate | 30–39 minutes | Worsening chronic condition; multiple problems; new data review |
| 99215 | High | 40–54 minutes | High-risk decision making; complex management |
CPT 99212 vs. 99213
99212 is for straightforward MDM with 10–19 minutes of total time. It typically involves one self-limited or minor problem (e.g., medication refill without change, brief follow-up for resolved issue). If the problem requires provider-level evaluation and low MDM or at least 20 minutes of work, 99213 is appropriate.
CPT 99213 vs. 99214
This is the most common and costly distinction to get wrong.
| Aspect | 99213 (Low) | 99214 (Moderate) |
| Problems | One stable chronic OR one acute uncomplicated | One or more chronic illnesses with exacerbation OR undiagnosed new problem |
| Data | Minimal (review or order limited tests) | Moderate (review of multiple external notes, independent interpretation) |
| Risk | Low (OTC drugs, minor surgery with no risk factors) | Moderate (prescription drug management, major surgery with risk factors) |
| Time | 20–29 minutes | 30–39 minutes |
99213 Examples:
- Diabetic patient with stable numbers, medication refill, routine follow-up
- Teen with sore throat, negative rapid strep, symptomatic relief advice
- Anxiety follow-up with stable symptoms, no treatment change
99214 Examples:
- Hypertensive patient with recent blood pressure spikes requiring medication adjustment
- Diabetic patient with A1c increase from 7.2 to 9.4 – clearly not stable
- Patient with mixed symptoms (fatigue, shortness of breath) requiring lab workup
Common Billing and Documentation Errors
Even experienced providers make mistakes that trigger denials or audits. Here are the most frequent issues with CPT 99213.
1. Insufficient MDM Documentation
Failing to clearly document the complexity of problems addressed or what data was reviewed. Solution: Use specific language. Write “reviewed CBC results from 10/15” instead of “labs reviewed.”
2. Counting Diagnoses Instead of Complexity
Physicians sometimes assign 99213 for three diagnoses and 99214 for four diagnoses. That is incorrect. Complexity is about the severity, stability, and management required – not the number of diagnosis codes.
3. Copy‑Paste Errors
Carrying forward outdated information from previous visits or having contradictory statements within the same note. Solution: Review and update all copied content for accuracy.
4. Time Documentation Issues
Missing start/stop times when billing based on time, or not specifying activities included. Solution: Document “Total time: 25 minutes including exam, counseling, and coordination of care.”
5. Undercoding (Using 99213 When 99214 Is Justified)
Many providers avoid 99214 out of fear of audits. However, Medicare’s own audit data shows that undercoding is far more common than overcoding – and it costs clinics thousands annually. Proper documentation, not the code itself, determines audit risk.
For more on the risks of incorrect coding, see our guides:
- Downcoding in Medical Billing: What It Is and How to Avoid It
- Upcoding in Medical Billing: Risks, Examples & Prevention
Reimbursement Rates (2026 Estimates)
Reimbursement for CPT 99213 varies by payer, location, and contract. Below are representative rates.
| Payer | Estimated Rate (Non‑Facility) | Notes |
| Medicare | $87–$109 | Varies by MAC locality |
| Medicaid | $48–$60 | Varies significantly by state |
| Blue Cross Blue Shield | $111–$120 | May bundle with other services |
| UnitedHealthcare | $125 | Subject to therapy caps if applicable |
| Aetna | $118 | Some plans require prior authorization |
Always verify rates with your specific payer contract and clearinghouse.
How to Avoid Downcoding and Denials
Prevention is more effective than appealing denials. Follow these best practices for clean 99213 claims.
- Document Medical Necessity – The level of service must make clinical sense given the patient’s presentation. A 99213 for a routine cold is appropriate; for a complex diagnostic workup, it is not.
- Use Specific Language – Instead of “labs reviewed,” write “reviewed BMP and CBC from 10/15.” Instead of “meds adjusted,” write “increased lisinopril from 10mg to 20mg for elevated BP.”
- Do Not Use 99213 as a “Safe Default” – Many providers reach for 99213 by instinct because it sits in the middle. That habit is risky. Each claim must be supported by documentation, not habit.
- Audit Your Own Claims – Review a sample of 99213 claims quarterly. Compare documentation to the MDM elements or time thresholds. Identify patterns of under‑ or over‑documentation.
- Train Providers Regularly – Coding rules change. Ensure your clinical team understands the difference between 99213 and 99214 and how to document MDM correctly.
- Use a Certified Coder – If possible, have a certified coder audit your claims before submission. This is especially valuable for practices with high claim volumes.
For more on timely claim submission and denial prevention, see:
Sample Documentation for CPT 99213
Here is a de‑identified SOAP note example that supports 99213 using MDM:
S: Patient reports feeling well, occasional headaches over past week. Denies chest pain, shortness of breath, or vision changes.
O: Blood pressure 130/85, heart rate 72 bpm, regular. Lungs clear. No focal deficits.
A: Hypertension well-controlled on current medication. Stable chronic condition. No acute complications. Low risk.
P: Continue lisinopril 10mg daily. Return to clinic in 3 months. Reviewed home BP log – acceptable range.
This note demonstrates:
- Problems: One stable chronic condition (low complexity)
- Data: Reviewed home BP log (qualifies as data review)
- Risk: Low (no medication change, routine follow-up)
The note meets two of three MDM elements at the low complexity level, supporting 99213.
Final Thoughts
CPT 99213 is the backbone of established patient outpatient coding. When used correctly, it accurately captures the value of routine follow-up visits for stable chronic conditions and uncomplicated acute problems. When misused – either through insufficient documentation or as a “safe default” – it leads to downcoding, revenue loss, and audit exposure.
The key to clean 99213 billing is understanding the low complexity MDM criteria and the 20–29 minute time threshold. Document specifically. Audit regularly. And never forget that medical necessity drives code selection, not habit.
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Frequently Asked Questions
1. What is CPT code 99213 used for?
CPT 99213 is used for an office or outpatient visit for an established patient that requires low complexity medical decision making or 20–29 minutes of total provider time on the date of service. Common examples include stable chronic condition follow-up and uncomplicated acute illnesses.
2. What is the difference between 99213 and 99214?
99213 requires low MDM or 20–29 minutes. 99214 requires moderate MDM or 30–39 minutes. The key difference is problem complexity: 99213 is for stable chronic or acute uncomplicated conditions; 99214 is for worsening chronic conditions, undiagnosed new problems, or moderate risk management.
3. How much time is required for CPT 99213?
When billing by time, CPT 99213 requires 20–29 minutes of total provider time on the date of service. This includes both face-to-face and non‑face-to-face activities (chart review, documentation, counseling, test ordering, etc.).
4. Can a nurse practitioner bill 99213?
Yes. CPT 99213 can be billed by physicians, nurse practitioners (NPs), physician assistants (PAs), and other qualified healthcare professionals for established patient visits that meet low MDM or time criteria.
5. What is the Medicare reimbursement rate for 99213?
The Medicare reimbursement rate for 99213 varies by locality. In 2026, typical rates range from $87 to $109 depending on the Medicare Administrative Contractor (MAC) region.
