In today’s regulatory climate, coders and providers can’t afford to underestimate the power of documentation—especially when it comes to E/M coding. And while Medical Decision Making (MDM) gets a lot of the spotlight, there’s another pathway that’s often misunderstood, misused, or completely overlooked: time-based coding.
To be clear—this isn’t just about tracking minutes. It’s about getting reimbursed for the full scope of clinical work that happens before, during, and after the exam room door closes. The 2021 CPT® guideline overhaul opened the door for a more realistic reflection of provider effort, but only if your documentation strategy is tight, defensible, and audit-proof.
If you’re not using time-based coding strategically, you’re either leaving money on the table or exposing your practice to compliance risk.
Let’s break it down.
The Regulatory Framework: What CPT and CMS Actually Say
Under the 2021 AMA E/M Guidelines (which still apply for 2025), providers can select E/M levels based on total time spent on the date of service—for office and outpatient visits (99202–99215). This was a game changer. You’re no longer stuck chasing bullet points or checking boxes.
CPT defines total time as all the time the billing provider personally spends on the patient’s care that day—face-to-face or not.
That means:
- Reviewing records and labs before the visit
- Counseling the patient
- Documenting in the EHR
- Coordinating with another provider
- Ordering meds or diagnostics
But here’s what it doesn’t include:
- Staff time
- Time spent on separately billable services
- Time spent on admin tasks, like scheduling or insurance auths
The CPT Time Chart: Office & Outpatient Visits
| Code | Total Time |
|---|---|
| 99202 | 15–29 mins |
| 99203 | 30–44 mins |
| 99204 | 45–59 mins |
| 99205 | 60–74 mins |
| 99212 | 10–19 mins |
| 99213 | 20–29 mins |
| 99214 | 30–39 mins |
| 99215 | 40–54 mins |
Source: 2024 CPT® Professional Codebook, E/M Guidelines section – Office or Other Outpatient Services; CMS MLN901344, Medicare Learning Network E/M Coding Updates
Pro Tip: You only need to hit the bottom end of the range. So 30 minutes? That’s a 99203. Don’t shortchange your time.
Where Time-Based Coding Goes Wrong
Let’s talk about how people mess this up—because I’ve seen it all:
- No time documented, but time used to select the code
- “30 mins spent” with no breakdown or explanation
- Including nurse time or tech time (nope, not allowed)
- Counting time spent on other procedures billed separately
- Using time inappropriately in inpatient or consult settings without following different rules
And when those errors hit a payer audit? You better believe it becomes a problem. Time-based coding is high-trust and high-risk. You need to defend it with precise, intentional documentation.
What That Documentation Should Actually Look Like
Here’s a solid example you can steal:
“Total time spent on the date of the encounter: 35 minutes. This includes reviewing outside records and labs (10 mins), patient counseling (20 mins), and documentation and order entry (5 mins).”
Clear. Defensible. Audit-ready.
Avoid vague notes like “30 minutes spent with the patient.” That’s not going to cut it anymore. Payers want specifics—and if you’re using time, your EMR should back it up with accurate audit trails.
When You Should Be Using Time-Based Coding
There are some situations where using time just makes more sense than trying to work the MDM angle:
- You’re doing extensive patient counseling or care coordination
- MDM isn’t clearly documented, but the time is
- You’re in specialties like psych, palliative care, or internal med where the thinking and educating outweigh the “fixing”
It’s also incredibly helpful when you’re trying to train new providers to document smarter. Time-based coding rewards detail and transparency.
Can You Use Time-Based Coding Sometimes and MDM Other Times?
Short answer: Yes.
Longer, more compliance-savvy answer: Yes—but be strategic about it.
Under the 2021 E/M guidelines, providers can choose either Medical Decision Making (MDM) or total time as the basis for selecting an E/M level—on a per-visit basis. There’s no rule that says you have to pick one method and stick to it forever.
So yes, you can use time today and MDM tomorrow. But there’s a catch…
If it looks like you’re jumping back and forth just to get a higher code? That’s audit bait. Payers and auditors love to pounce on inconsistency—especially when it feels like revenue-maximizing behavior rather than defensible coding.
To avoid that risk:
- Pick a default method for each provider or visit type (e.g., internal med = time, urgent care = MDM)
- Train your team to document both MDM and time when possible—so coders can choose the most defensible path
- Make sure your EHR templates support both styles of documentation
Just because you can switch between time and MDM doesn’t mean you should do it casually. Like anything in revenue cycle, it’s all about strategy and consistency.
The Compliance Perspective: Undercoding Is Still Fraud
I’ve seen instances where coders or practices get nervous and undercode “just to be safe.” But here’s the hard truth: undercoding is just as risky as overcoding under the False Claims Act.
If the provider spends 45 minutes with the patient and documents that appropriately, they deserve to be paid for it. Period.
Use the rules to your advantage—compliantly.
Closing Thoughts: Use Time Strategically
Time-based coding isn’t a shortcut. It’s a strategy. And when used correctly, it reflects the actual work providers are doing that MDM sometimes can’t fully capture.
So if your team’s spending 30, 40, even 60 minutes managing a complex patient but billing a 99213 based on vague documentation—you’re doing a disservice to the practice and opening the door to audit risk.
Want to code smarter and protect your revenue?
Start reviewing your templates. Start tracking your time. And make sure your providers aren’t giving away free care just because no one taught them how to code it.
Compliantly yours,
Whitney