Free 8-Minute Rule Cheat Sheet Download

With most buyer-seller transactions, calculating the cost of a product or service is fairly simple. However, when it comes to Medicare units and payment for physical therapy services, things aren't always so straightforward. Two billing methodologies commonly apply to timed rehabilitation services: Medicare’s 8-minute rule and the AMA Rule of Eights. Although both use an eight-minute threshold, they calculate billable units differently. Here is a rundown of the rule and how it can affect billing and payment for therapy services.

The Basics of the 8-Minute Rule

The 8-Minute Rule governs how rehab therapists determine the number of units they should bill to Medicare for outpatient therapy services on a particular date. This rule also applies to other insurances that follow Medicare billing guidelines. Essentially, a therapist must provide direct, one-on-one therapy for at least eight minutes to receive reimbursement for one unit of a time-based treatment code. While this may sound simple, complexities arise when billing both time-based and service-based codes for a single patient visit.

This 8-minute rule cheat sheet will help your clinicians streamline billing and administrative tasks, saving valuable time.

8 Minute Rule Cheat Sheet PDF

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Time-Based Units vs. Service-Based Units

First, its important to understand the difference between time-based and service-based CPT codes. Service-based (or untimed) codes are used for services such as conducting a physical therapy examination, applying hot or cold packs, group therapy, or providing electrical stimulation (unattended). For these services, you cant bill more than one unit, regardless of the amount of time spent delivering treatment.

Service-based CPT Codes Examples

• Physical therapy evaluation

  • CPT Code 97161

  • CPT Code 97162

  • CPT Code 97163

  • PT Re-evaluation: CPT Code 97164

• Hot or cold packs

  • CPT Code 97010

• Group therapy

  • CPT Code 97150

• Electrical stimulation (unattended)

  • CPT Code 97014 or G0283 for Medicare

Time-based (or direct time) codes, on the other hand, allow you to bill multiple units in 15-minute increments (i.e., one unit = 15 minutes of direct therapy). These codes are used for one-on-one, constant attendance procedures and modalities such as therapeutic exercise and activities, manual therapy, neuromuscular re-education, gait training, ultrasound, iontophoresis, prosthetic training, physical performance test, or attended electrical stimulation.

Time-based CPT Codes Examples

• Therapeutic exercise

  • CPT Code 97110

• Therapeutic activities

  • CPT Code 97530

• Manual therapy

  • CPT Code 97140

• Neuromuscular re-education

  • CPT Code 97112

• Gait training

  • CPT Code 97116

• Ultrasound

  • CPT Code 97035

• Iontophoresis

  • CPT Code 97033

• Electrical stimulation (manual)

  • CPT Code 97032

• Prosthetic training

  • CPT Code 97761

• Physical performance test or measurement

  • CPT Code 97750

• Self-care/home management training

  • CPT Code 97535

Minutes and Billing Units

According to CPT guidelines, each timed code represents 15 minutes of treatment. But therapy sessions don't always fit neatly into 15-minute blocks. For example, if you provide ultrasound for 11 minutes or manual therapy for 6 minutes, you need the 8-Minute Rule. Per Medicare rules, to bill one unit of a timed CPT code, you must perform the associated modality for at least 8 minutes. Medicare adds up the total minutes of skilled, one-on-one therapy and divides the sum by 15. If eight or more minutes are left over, you can bill for an additional unit. If seven or fewer minutes remain, Medicare will not reimburse you for another unit, and those minutes are essentially lost. For example, if you performed manual therapy for 15 minutes and ultrasound for 8 minutes, you could bill two direct time units.

Mixed Remainders

According to CPT guidelines, each timed code is intended to represent 15 minutes of treatment. However, treatments do not always fit perfectly into these 15-minute segments. In such instances, the 8-minute rule comes into play. Medicaid billing guidelines specify that for a therapist to bill a unit of a time-based CPT code, which typically signifies 15 minutes, they must deliver at least 8 minutes of uninterrupted therapy.

Handling mixed remainders can be challenging. If, after dividing the total treatment time by 15, there are leftover minutes from multiple services (codes), these are referred to as mixed remainders. When the combined total of these remainders reaches 8 minutes or more, an additional unit of the service (code) with the longest duration can be billed.

What Is the AMA Billing Rule?

The AMA billing rule, commonly called the Rule of Eights, midpoint rule, or Substantial Portion Methodology, is a method for calculating units of timed CPT codes. While Medicare calculates the maximum number of units using the combined minutes from all timed services, AMA billing applies the eight-minute threshold separately to each CPT code.

Under the AMA Rule of Eights, a timed service must be provided for at least eight minutes before one unit of that individual CPT code can be billed. Minutes from separate services generally cannot be combined to qualify a code for a billable unit.

The standard AMA billing time ranges for a single timed CPT code are:

For example, suppose a patient receives:

• 10 minutes of manual therapy

• 8 minutes of therapeutic exercise

• 18 total timed minutes

Under the Medicare 8-minute rule, the 18 combined minutes support one billable unit. Under the AMA billing rule, each CPT code independently reaches the eight-minute threshold, so the services may support two units: one unit of manual therapy and one unit of therapeutic exercise.

Medicare 8-Minute Rule vs. AMA Billing

The main difference between Medicare and AMA billing is how the minutes are counted.

The difference also matters when several services last fewer than eight minutes. For example, consider six minutes each of therapeutic exercise, manual therapy, and therapeutic activities:

• Medicare: The 18 combined timed minutes may support one unit, assigned according to Medicare’s rules.

• AMA: None of the individual services reaches eight minutes, so none supports a billable unit.

Some commercial insurers follow AMA billing guidelines, while Medicare and certain other payers use Medicare’s total timed-code methodology. Payer policies and contracts can differ, so verify the required calculation method before submitting a claim.

Is the AMA Rule the Same as the 8-Minute Rule?

No. The names are sometimes used interchangeably because both methods use eight minutes as the minimum threshold for a partial 15-minute unit. However, the calculations differ:

• The Medicare 8-minute rule combines minutes from timed CPT codes to determine the total number of billable units.

• The AMA Rule of Eights applies the threshold separately to each timed CPT code.

8-Minute Rule FAQ

What is the 8-Minute Rule?

To receive payment from Medicare for a time-based CPT code, a therapist must provide direct treatment for at least eight minutes. Providers must add the total minutes of skilled, one-on-one therapy and divide by 15. If eight or more minutes remain, you can bill one more unit. Otherwise, you cannot.

What is the AMA billing rule?

The AMA billing rule, also called the Rule of Eights or midpoint rule, calculates units separately for each timed CPT code. An individual service generally must reach at least eight minutes to qualify for one unit, and minutes from different CPT codes are not combined to reach that threshold.

What are time-based CPT codes?

Time-based codes allow for variable billing in 15-minute increments. These differ from service-based codes, which providers can only bill once regardless of the time spent on treatment.

How should a therapist bill for mixed remainders?

For Medicare, if the sum of leftover minutes from multiple services is at least eight minutes, bill for the service with the largest total time, even if its less than eight minutes alone.

Does the 8-Minute Rule apply to Medicare Part A services?

No, it only applies to Medicare Part B services.

What insurance companies require the 8-Minute Rule?

Medicare and some other plans require the 8-Minute Rule. Check with individual payers for specific billing requirements.

Which billing method is better, the 8-Minute Rule or SPM?

It depends on the payer. For Medicare, the 8-Minute Rule is required. For other payers, you may want to use the method that maximizes reimbursement for your practice.

Is the 8-minute Rule mandatory?

Using CMS's interpretation of aggregating timed procedure codes (the 8-minute rule) is mandatory when you submit reimbursement claims for Medicare Part B billing. Some private insurers use the 8-minute rule, the AMA Rule of Eights, or their own proprietary billing rules. Review the rules for each insurance company carefully to avoid billing issues, denials, and delays. Understanding and applying the 8-Minute Rule can streamline your billing process and ensure accurate payments for your services. By leveraging digital tools and staying informed about payer requirements, you can navigate the complexities of therapy billing with confidence.