- Key Takeaways
- CPT code 99213 reports an established patient office visit with low complexity medical decision making or 20 to 29 minutes of total time on the encounter date.
- Undercoding a qualifying 99214 visit as 99213 is the most common and costly error, quietly forfeiting revenue the documentation would have fully supported.
- The AMA sets the time-based threshold for this level at 20 to 29 minutes of total encounter-day work, with 30 minutes shifting the visit to 99214.
- Because it is billed so heavily, an unusually high share of this level relative to peers can itself invite payer review, not only unsupported higher-level coding.
- Low complexity means meeting two of three elements at the low level, so notes should state problem status, any data reviewed, and the low management risk.
In the most recent Medicare reporting period, established patient office visits ranked as the third-largest source of improper payments among all service types, roughly $853 million, and about 65 percent of that traced to incorrect coding rather than fraud. CPT code 99213 sits at the center of that family, and here the coding problem usually runs in the direction practices least suspect. Not overbilling, but underbilling. Defaulting to 99213 because it feels safe quietly forfeits revenue, and, as this guide explains, it is not always as safe as it looks.
Current as of 2026. Always verify code status and payment with your specific payer, since policies change.
What CPT code 99213 covers and who uses it?
CPT code 99213 reports an office or other outpatient visit for an established patient, someone seen by the provider or practice within the past three years. In billing shorthand it is the Level 3 established patient code, one step above 99212 and one below 99214.
It is one of the most frequently billed codes in all of US healthcare, and not only in primary care. Internists, family physicians, cardiologists, psychiatrists, dermatologists, neurologists, and most specialties that manage ongoing conditions rely on it for the routine follow-up: the stable chronic condition being monitored, a medication refill with a brief review, an uncomplicated acute problem. Nurse practitioners and physician assistants bill it too, subject to payer and scope-of-practice rules. Because it is billed so heavily and across so many specialties, payers watch its patterns closely.
When to use 99213: the two pathways
Since the 2021 E/M guideline overhaul, history and exam no longer set the level. They still need to be medically appropriate, but selection rests on one of two things.
- Low complexity medical decision making. To support 99213 on the MDM pathway, the visit reaches a low level in at least two of three areas: the number and complexity of problems addressed, the amount and complexity of data reviewed, and the risk of the management decisions. In practice that looks like one stable chronic illness, or two minor self-limited problems, with limited or no data review and low-risk decisions.
- Total time. Alternatively, 99213 is supported when total time on the encounter date lands between 20 and 29 minutes. That includes chart review, the encounter itself, counseling, coordination, and documentation done by the billing provider on that date. Staff time does not count. Cross 30 minutes and the visit belongs at 99214.
Documentation payers expect
Even though 99213 is a low-complexity code, high volume makes it a monitored one, and thin notes cause problems in both directions. The record should stand on its own.
If you bill on MDM, state the problems and their status (stable, improving, worsening), any data reviewed, and the low risk of the plan. “Hypertension, stable, continue current medication, recheck in three months” supports the level cleanly. If you bill on time, record the total plainly: “Total time on today’s encounter was 24 minutes, including chart review, examination, and documentation.” A clear total is what a payer needs to confirm the level.
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Common errors and how to avoid them
The two most common mistakes with 99213 pull in opposite directions, and both trace back to notes that do not match the visit:
- Undercoding: billing 99213 for a visit that actually met 99214. A patient with two stable chronic conditions who leaves with a medication change qualifies for 99214, not 99213. Repeated across a panel, this quietly drains real revenue.
- Overcoding: billing 99213 when the visit only supported 99212, or billing 99213 without documentation that establishes even low complexity.
There is also a quieter risk. Reflexively downcoding to 99213 to avoid audits is not the safe move it seems. Medicare’s Targeted Probe and Educate reviews and payer utilization analysis flag providers whose billing patterns fall outside peer norms, and a distribution skewed heavily toward 99213 can draw an undercoding review just as an upcoding pattern would. Neolytix’s medical billing compliance overview covers how these pattern-based reviews work.
The fix for all of this is the same discipline used at any level: a quarterly self-audit. Pull 90 days of your 99212 through 99215 claims and look at the distribution against your actual patient complexity. If most of your established visits cluster at 99213 while your patients carry multiple active conditions, the codes and the documentation are out of step. Correct it through provider education before a payer notices. And when a 99213 claim is downcoded or denied, run a root-cause review rather than a one-off resubmission, so the same issue does not repeat. Neolytix’s complete guide to denial management lays out that workflow.
99213 vs 99214: where the line falls
Most 99213 decisions are really a choice between 99213 and 99214, so it helps to see them side by side. The split comes down to two things: the level of medical decision making, and total time.
Factor | 99213 | 99214 |
MDM level | Low complexity (two of three low elements) | Moderate complexity (two of three moderate elements) |
Total time | 20 to 29 minutes | 30 to 39 minutes |
Typical visit | One stable chronic condition, a minor self-limited problem, or a routine refill with brief review | Two or more stable chronic conditions, one chronic illness that is worsening, or a new problem with uncertain prognosis |
Data and risk | Limited or no data review, low-risk decisions | Moderate data review, or prescription drug management, which counts as moderate risk on its own |
The single most useful cue: if you start, change, or actively monitor a prescription medication, the risk element is already at moderate, and one more moderate element usually moves the visit to 99214. Two stable chronic conditions being managed together does the same. When neither applies and the visit is genuinely low complexity or lands at 20 to 29 minutes, 99213 is the correct call, not a cautious downgrade. For the full breakdown of the moderate-complexity threshold, see our guide to CPT code 99214.
Related codes and modifiers
The boundaries define 99213. Below it, 99212 covers minimal, self-limited problems. Above it, 99214 is moderate-complexity MDM or 30 to 39 minutes, and 99215 is high complexity or 40 to 54 minutes. The 99213 to 99214 line is where most established-visit revenue is won or lost, so it is worth knowing cold. Our companion guide to CPT code 99214 walks through that threshold in detail.
Modifier 25 applies when 99213 is billed on the same day as a minor procedure, marking the visit as a significant, separately identifiable service. For telehealth in 2026, 99213 still applies when the visit meets the same MDM or time requirement as an in-person encounter. Append modifier 95 for audio-video and use place of service 02 or 10, and confirm audio-only rules with the payer.
Reimbursement context
Payment varies by payer, setting, and geography. Under Medicare, 99213 pays less than 99214, and that gap is the entire financial case against habitual undercoding: every qualifying 99214 billed as 99213 is work delivered and not fully paid. Treat any single figure as illustrative and confirm current rates for your locality through the CMS Physician Fee Schedule Look-Up Tool, which updates annually.
The bottom line
99213 is the workhorse of outpatient billing, and its simplicity is exactly what makes it easy to misuse. The goal is not to bill higher, it is to bill accurately: match the code to the documented complexity or time, every time. Practices that audit their own distribution capture the revenue they have earned and stay clear of pattern-based reviews. For those without the bandwidth to run that review in-house, Neolytix has supported healthcare organizations across the United States for over 14 years, with E/M coding review built into its medical billing services so claims are accurate before they go out.
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This guide reflects Neolytix’s expertise in healthcare revenue cycle management and is intended for educational purposes only. It does not constitute legal or compliance advice. CPT codes and reimbursement rates are periodically updated by the AMA and CMS.
Sources
- AAPC. HHS releases Medicare fee-for-service improper payment rates (established office visit improper payment data). https://www.aapc.com/blog/93992-hhs-releases-medicare-fee-for-service-improper-payments-rates-for-2025/
- Centers for Medicare & Medicaid Services. Comprehensive Error Rate Testing (CERT) program. https://www.cms.gov/data-research/monitoring-programs/improper-payment-measurement-programs/comprehensive-error-rate-testing-cert
- Centers for Medicare & Medicaid Services. Evaluation & Management Services (MDM and time guidance). https://www.cms.gov/training-education/medicare-learning-networkr-mln/compliance/medicare-provider-compliance-tips/evaluation-management-services
- Centers for Medicare & Medicaid Services. Physician Fee Schedule Look-Up Tool. https://www.cms.gov/medicare/physician-fee-schedule/search
- American Medical Association. CPT and E/M office visit guidelines (99213 descriptor). https://www.ama-assn.org/practice-management/cpt
Frequently Asked Questions
What is the time requirement for CPT 99213?
On the time pathway, 99213 requires 20 to 29 minutes of total time on the date of the encounter. That includes chart review, the visit, counseling, coordination, and documentation by the billing provider. Reaching 30 minutes moves the visit to 99214, while under 20 minutes points toward 99212.
What is the difference between 99212 and 99213?
99212 covers a straightforward established visit with minimal problems, minimal data, and 10 to 19 minutes of time. 99213 requires low complexity across two of three MDM elements or 20 to 29 minutes. Billing 99212 when the visit met 99213 is a frequent, avoidable undercoding error that reduces reimbursement.
How do I know whether to bill 99213 or 99214?
Bill 99214 instead of 99213 when the visit reaches moderate complexity: two or more stable chronic conditions, one chronic illness that is worsening, a new problem with uncertain prognosis, or prescription drug management. If none of those apply and the visit is low complexity or 20 to 29 minutes, 99213 is correct.
Can CPT 99213 be billed for telehealth visits?
Yes. 99213 can be billed for telehealth when the visit meets the same low complexity MDM or 20 to 29 minute requirement as an in-person visit. Append modifier 95 for audio-video encounters and use the correct place of service. Audio-only coverage varies by payer, so confirm the policy before submitting.
What documentation is required for a 99213 visit?
Document the problems addressed and their status, any data reviewed, and the low risk of the management plan, or record total time if billing on time. The note should let a reviewer confirm low complexity without guessing. Vague entries like “follow-up, stable” without specifics are a common reason 99213 claims are questioned.
