A practice that bills patients for outpatient therapy services cannot afford to ignore the Medicare 8-minute rule. The Centers for Medicare & Medicaid Services (CMS) introduced this rule in April 2000, and it has since been a vital part of medical billing.
The guidelines for billing outpatient physical and occupational therapy briefly discuss the mechanics of the 8-minute rule, but understanding the details is essential for accurate billing.
The 8-minute rule of Medicare is a billing guideline mandating at least 8 minutes of timed, one-on-one contact with the patient, where the total time determines billable units.
This rule applies to timed therapy services billed under Medicare Part B, such as:
- Physical therapy (PT)
- Occupational therapy (OT)
- Speech-language pathology (SLP)
Time-Based vs. Service-Based CPT Codes
Medicare billing guidelines do not treat every CPT code the same. Therefore, before learning about the 8-minute rule in Medicare, here is a look at the difference between time-based and service-based CPT codes.
Service-Based Codes
Service-based CPT codes, also known as “untimed” codes, represent services that are not affected or changed by time. Meaning, these services or procedures can typically be provided to patients once and billed as one unit per session. Some common examples of such codes include:
- Physical Therapy Evaluation (97161)
- Mechanical Traction (97012)
- Electrical Stimulation, unattended (97014)
Simply put, medical billers can report only one unit of these codes when billing (independent of the total duration of the procedures or how many times they were performed on the patient).
Time-Based Codes
Conversely, the American Medical Association (AMA) CPT codebook explains that time-based codes are applicable to one-on-one services provided to patients in 15-minute blocks. Therefore, for time-based codes, 1 unit represents 15 minutes.
This is where billing professionals must refer to the Medicare 8-minute rule to determine the number of billable units within a visit. Some time-based CPT codes include:
- Therapeutic Exercise (97110)
- Manual Therapy (97140)
- Therapeutic Activities (97530)
The following table comprehensively covers the key differences between time-based and service-based CPT codes.
| Feature | Time-Based Coding | Service-Based Coding |
|---|---|---|
| What Doesn’t Count | Staff time, administrative tasks, and other-day work | Time or unit calculation in 15-minute blocks. |
| Applicable Scenario | Long visits, extensive counseling | Most routine procedures & visits |
| Primary Requirement | Document total minutes | Document procedure details |
| Ideal For | Counseling-heavy visits | Complex care |
Medicare 8-Minute Rule: Working Process
The Medicare 8-minute rule’s working process is simple yet necessary for accurate medical billing. Therefore, medical practitioners and billing staff must learn how the process works.
How to Calculate Billable Units with the 8-Minute Medicare Rule?
When calculating billable units under the 8-minute rule of Medicare, start by adding the total minutes of service (including time-based services provided during the session). Next, divide the total number achieved by 15 to know the base units.
Lastly, if the remaining number, or remainder, is 8 or more (in minutes), an additional unit will be added to it.
For instance, if the total minutes spent on the service are 40. So, 40 divided by 15 = 2.67 units
Therefore, the total number of units billable will be 3.
The Medicare 8-Minute Rule Unit Chart
The following table provides a simple breakdown of the procedure period and its total billable units:
| Total Timed Duration (Minutes) | Billable Units |
|---|---|
| 0-7 minutes | 0 units |
| 8-22 minutes | 1 unit |
| 23-37 minutes | 2 units |
| 38-52 minutes | 3 units |
| 53-67 minutes | 4 units |
| 68-82 minutes | 5 units |
| 83-97 minutes | 6 units |
Source: ASHA
Note: The Medicare 8-minute rule dictates that the provider must spend at least 8 minutes of face-to-face time with the patient for the service to be considered billable and valid. Therefore, if a physical therapist spent 8 minutes directly helping the patient perform exercises and the remaining 7 minutes (out of a 15-minute session) on documentation, he can still bill 1 unit of the code.
Medicare 8-Minute Rule – Examples
Now that we have discussed the majority of the billing details applicable to the 8-minute rule in Medicare, let’s look at some examples to understand its scenario-based applications better:
Example 1
Consider a physical therapist who conducts a 38-minute session for therapeutic exercises, CPT 97110.
In this scenario,
- 30 ÷ 15 = 2 full units
- 8 minutes remaining = 1 more unit
Therefore, the total billing will be for 3 units of 97110.
Example 2
Now consider a physical therapist who conducts a 15-minute session for therapeutic exercises, CPT code 97110. He also dedicates an additional 8 minutes to therapeutic activities, reported with CPT code 97530, and 5 minutes for manual therapy, CPT 97140.
In this case, we will add the three time periods:
- Adding individual therapy times: (15 + 8 + 5)
- Total time = 28 minutes
As per the chart above, 23-37 minutes of service equals 2 units. Hence, 2 units will be billed.
Example 3
Imagine the case of a therapist who spends 6 minutes providing manual therapy to the patient under CPT code 97140. He also spends 5 minutes on neuromuscular re-education (97112).
According to this case, the total time = 6 + 5 = 11 minutes
Thus, 1 unit is billable.
Note: In this case, neither of the services appended reached 8 minutes on their own. However, their combined time qualifies for billing.
Example 4
Consider the case of a therapist who provides a total of 5 minutes of gait training, billed using CPT code 97116, which is the timed service during this session.
According to this case, the total time rendered was 5 minutes. Therefore, 0 units are billable under Medicare, and the payer cannot be billed for the service.
Note: Units should be assigned to the service or CPT code with the greatest time first, and the total time for all timed services is combined before calculating units.
Master the 8-Minute Rule with NeuraBill
The Medicare 8-minute rule is a guideline applicable to time-based services. The rule determines billable units for timed therapy services where the provider spends one-on-one time with a patient. With the help of this rule, providers can charge payers an accurate amount for their services.
Although this guide provides tools for optimized billing processes, outsourcing medical billing and coding services to specialized billing companies is an effective strategy to counter bottlenecks.
FAQs
What are the common mistakes in using the 8-minute rule?
Several mistakes related to the Medicare 8-minute rule may occur. These may include:
-Incorrectly rounding time
-Wrongly billing time-based and service-based codes
-Not documenting the time spent on each service
-Billing for non-direct patient time
-Not counting legitimate skilled assessment time spent educating, counseling the patient, or assessing their response
What happens if you don’t meet the 8-minute rule?
Typically, billing the Medicare 8-minute rule inaccurately results in claim denials and payment takebacks. However, it can result in an increased audit risk from Medicare Administrative Contractors (MACs). The MAC might inquire and demand repayment for services billed for several past years.
Does the 8-minute rule apply to all insurance?
Medicare patients generally qualify for the 8-minute rule because commercial payers may use the AMA Rule of Eights. Other private payers, such as TRICARE or Medicaid, may also follow the 8-minute rule, depending on their individual policy.
