Medical Coding: Time-Based Coding Guidelines and Tips
Time based medical coding applies when the amount of time a provider spends determines the level of service reported. It is an essential concept in medical coding and billing. In addition, proper documentation of time supports accurate reimbursement and compliance with payer guidelines.
What Is Time-Based Coding?
Time-based coding applies when time is the controlling factor in selecting a CPT code. For example, for office and other outpatient E/M visits, you may use the total time on the date of the encounter instead of MDM. Time also controls code selection for services that list time in the code descriptor.
Keep in mind that counseling and coordination of care no longer need to make up more than 50% of an office visit. CPT retired that rule for office visits in 2021.
Common services that use time include E/M visits, prolonged services, critical care, behavioral health services, and care management services.
When Can You Use Time as the Key Factor?
You can select a code based on time when the medical record clearly documents three things. First, it must show the total time spent. Second, it should describe the activities performed during that time. Third, it must show that the physician or other qualified health care professional spent the time on the date of the encounter.
For office and outpatient E/M codes, time includes both face to face and non face to face work the provider performs on the date of service. For instance, it includes reviewing records, ordering tests, coordinating care, and documenting in the medical record.
Time-Based Coding for E/M Services
Under current office and outpatient E/M guidelines, you can select the code based on either total time or Medical Decision Making (MDM). Each code has a single minimum total time that must be met or exceeded, because CPT removed the time ranges.
-
99202: 15 minutes
-
99203: 30 minutes
-
99204: 45 minutes
-
99205: 60 minutes
-
99212: 10 minutes
-
99213: 20 minutes
-
99214: 30 minutes
-
99215: 40 minutes
In other words, when you code by time, the total documented time must meet or exceed the minimum time for the code you select.
Prolonged Services and Time
You may report prolonged service codes when the provider’s time extends beyond the time threshold for the primary E/M code. However, the time must clearly exceed that threshold, and the documentation must support the medical necessity of the extra time. Also, payers have different rules for reporting prolonged services, so always check the payer policy.
Prolonged service codes: CPT 99417 vs Medicare G2212
For office and outpatient visits selected by time, CPT code 99417 is reported for each full 15 minutes beyond the minimum time of 99205 (60 minutes) or 99215 (40 minutes). That means the first unit of 99417 starts at 75 minutes for 99205 and at 55 minutes for 99215.
Medicare does not accept 99417. Medicare uses HCPCS G2212 instead, which starts 15 minutes after the maximum time of the former time ranges: at 89 minutes for 99205 and at 69 minutes for 99215. Always confirm which rule a commercial payer follows.
Critical care time thresholds
Critical care code 99291 covers the first 30 to 74 minutes, and 99292 is reported for each additional 30 minutes. Under CPT rules the first unit of 99292 is reported at 75 minutes. Medicare requires 104 minutes before the first unit of 99292. Less than 30 minutes of critical care is reported with the appropriate E/M code instead.
Critical Care and Time-Based Coding
Critical care codes are always time based. The time does not need to be continuous, but the provider must be immediately available to the patient and devote full attention to the critically ill patient. Critical care time includes time at the bedside or on the unit. However, it cannot include time spent on separately reportable procedures. Finally, the medical record must clearly document the time.
Documentation Requirements for Time-Based Services
Strong documentation is essential for compliant time based coding. The provider should document start and stop times when required, the total time on the date of service, and a description of the work performed. Also, the provider should note time spent counseling or coordinating care when applicable.
Here is an example of acceptable documentation: “Total time spent on today’s visit: 42 minutes, including reviewing labs, counseling the patient on treatment options, and documenting the encounter.”
Common Time-Based Coding Mistakes to Avoid
Medical coders should watch for several common errors. For example, the provider may fail to document the total time or may not show how the time was spent. Coders sometimes use time when MDM would have been the better choice. In addition, watch for incorrect rounding and for prolonged service codes reported without meeting the time threshold.
Practical Time-Based Coding Tips
Always verify the current CPT and payer specific time thresholds. Next, look for explicit documentation of the total time, and confirm whether the provider used time or MDM to select the code. Also, make sure the record clearly describes counseling and coordination time. Finally, avoid assumptions when the record does not clearly document time.
Why Time-Based Coding Matters
Accurate time based coding supports proper reimbursement and reduces audit risk. It also communicates the provider’s work clearly and keeps you compliant with Medicare and commercial payer rules. Above all, when done correctly, it reflects the true complexity and effort of patient care.
Frequently Asked Questions About Time-Based Coding
What counts toward total time for an office visit?
Total time on the date of the encounter includes both face-to-face and non-face-to-face work by the physician or other qualified health care professional, such as reviewing records, ordering tests, documenting and coordinating care. It does not include time spent on separately reported services or travel.
Do I need more than 50% counseling to code an office visit by time?
No. CPT removed the counseling and coordination of care requirement for office visits in 2021. Office visits can be selected by total time or by medical decision making.
What are the 2026 office visit time thresholds?
New patients: 99202 at 15 minutes, 99203 at 30, 99204 at 45 and 99205 at 60. Established patients: 99212 at 10 minutes, 99213 at 20, 99214 at 30 and 99215 at 40. Each threshold must be met or exceeded.
When do I use 99417 instead of G2212?
Use 99417 for payers that follow CPT rules and G2212 for Medicare. The two codes start at different total times.
Related Resources
What is Evaluation and Management (E/M) in Medical Coding
E/M Coding 2025
AMA CPT E/M GUIDELINES