For therapists, the difference between 22 minutes and 23 minutes can change how many timed units are billable under Medicare.
That sounds simple until one visit includes therapeutic exercise, manual therapy, neuromuscular re-education, gait training, or several timed services at once. At that point, therapists need to know more than the basic “8 minutes equals one unit” rule.
The Medicare 8-minute rule determines the number of billable units for applicable therapy services reported in 15-minute increments. When multiple timed services are provided by the same therapy discipline on the same date of service, the total timed treatment minutes determine how many timed units may be billed. Those units must then be allocated to the individual CPT codes based on the actual minutes spent providing each service.
Understanding that process helps PT and OT practices document treatment time accurately, avoid preventable unit-calculation errors, and create billing records that support the services reported.
What Is the Medicare 8-Minute Rule?
The Medicare 8-minute rule determines how many units of applicable 15-minute timed therapy services may be billed based on the total timed treatment minutes provided.
Under the Medicare calculation, 8 to 22 minutes supports 1 timed unit, 23 to 37 minutes supports 2 units, and 38 to 52 minutes supports 3 units. When multiple timed CPT codes are performed, the therapist first determines the total number of billable units and then allocates those units according to the minutes spent on each service.
Key Takeaways
- The Qualified Business Income deduction is now permanent for eligible taxpayers.
- The 2026 Section 179 deduction limit is $2.56 million, subject to eligibility rules and phaseouts.
- Certain qualifying business property acquired after January 19, 2025 may qualify for 100% bonus depreciation.
- The 2026 business mileage rate is 5 cents per mile through June 30 and 76 cents per mile beginning July 1.
- Therapy practices should distinguish recurring business expenses, such as software subscriptions, from equipment purchases that may be subject to depreciation rules.
- Physical therapy and similar healthcare services can be treated as a Specified Service Trade or Business for QBI purposes, making income thresholds especially important.
Table of Contents
What Is the 8-Minute Rule in Therapy Billing?
The 8-minute rule is Medicare’s methodology for determining billable units for certain therapy services that are defined in 15-minute increments.
The rule matters because a therapist does not always have to provide a full 15 minutes to report one timed unit.
For example:
- 7 minutes: 0 timed units
- 8 minutes: 1 timed unit
- 15 minutes: 1 timed unit
- 22 minutes: 1 timed unit
- 23 minutes: 2 timed units
But this is only the beginning of the calculation.
If several timed interventions occur during the same treatment session, Medicare does not simply apply the 8-minute threshold independently to each code and add the results together.
Instead, the therapist first totals the applicable timed treatment minutes for that therapy discipline on that date of service. That total determines the number of timed units available. The therapist then determines which CPT codes should receive those units based on the minutes associated with each service.
That second step is where many 8-minute-rule questions arise.
Medicare 8-Minute Rule Chart
The following chart shows the Medicare timed-unit thresholds:
| Total Timed Treatment Minutes | Billable Timed 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 |
| 98-112 minutes | 7 units |
| 113-127 minutes | 8 units |
The pattern continues in 15-minute increments for longer treatment durations. CMS guidance states that when total timed treatment minutes are less than 8 minutes, the timed service or services should not be billed as a timed unit.
A Quick Way to Read the Chart
The thresholds occur at:
8, 23, 38, 53, 68, 83, 98, 113 minutes
Each additional 15 minutes after the first 8-minute threshold moves the treatment into the next unit range.
The chart tells you how many timed units are available.
It does not, by itself, tell you which CPT codes receive those units when multiple timed interventions were performed.
That requires the allocation step explained below.
Which Therapy CPT Codes Are Timed?
Timed codes have a time component built into the code description, commonly in 15-minute increments.
Examples frequently used in PT and OT include:
| CPT Code | Service | Timed? |
|---|---|---|
| 97110 | Therapeutic Exercise | Yes |
| 97112 | Neuromuscular Re-education | Yes |
| 97116 | Gait Training | Yes |
| 97140 | Manual Therapy | Yes |
| 97530 | Therapeutic Activities | Yes |
| 97535 | Self-Care/Home Management Training | Yes |
| 97035 | Ultrasound | Yes |
For applicable timed therapy services, clinicians should document the actual skilled treatment minutes associated with each service. CMS emphasizes that the medical record must support both the CPT codes and the number of units billed.
Not every therapy service is timed.
Evaluation and other untimed services follow their own code-specific billing rules and should not be included in the timed-minute calculation simply because they occurred during the same visit.
What Counts as Treatment Time Under the 8-Minute Rule?
For applicable timed services, count the skilled intra-service treatment time during which the qualified professional or auxiliary personnel is directly providing the timed service to the patient.
CMS distinguishes that time from periods when the patient is present in the clinic but is not actually receiving the skilled timed intervention.
Time That Can Count
Depending on the service being provided, timed treatment may include:
- Direct skilled treatment
- Skilled assessment that occurs as part of delivering the intervention
- Direct one-on-one performance of the applicable timed therapy procedure
Time That Should Not Be Added to Timed Treatment Minutes
CMS guidance excludes time such as:
- Waiting for treatment to begin
- Waiting for equipment
- Rest periods when treatment is not being provided
- Toileting
- Changing
- Independent exercise
- Unskilled supervision
- Pre-service or post-service activities that are not part of the timed intervention
This is an important distinction.
A patient may be in the clinic for 60 minutes while having fewer than 60 timed treatment minutes.
Total visit duration is not automatically the same as total timed treatment minutes.
How Do You Calculate Units Using the 8-Minute Rule?
For a visit involving multiple timed CPT codes, use a consistent process.
Step 1: Record the Actual Minutes for Each Timed Service
Example:
- CPT 97110 Therapeutic Exercise: 24 minutes
- CPT 97112 Neuromuscular Re-education: 23 minutes
Do not automatically round either service to a 15-minute block.
Document the actual minutes provided.
Step 2: Add All Timed Treatment Minutes
24 + 23 = 47 timed minutes
Step 3: Use the Medicare Chart
47 minutes falls within:
38-52 minutes = 3 timed units
You now know the session supports 3 total timed units.
Step 4: Allocate Complete 15-Minute Blocks
Break the services down:
97110: 24 minutes
= one full 15-minute block + 9 remaining minutes
97112: 23 minutes
= one full 15-minute block + 8 remaining minutes
Each service contains at least one complete 15-minute block, so each receives at least one unit.
That accounts for 2 of the 3 available units.
Step 5: Allocate the Remaining Unit
Compare the remaining minutes:
- 97110: 9 remaining minutes
- 97112: 8 remaining minutes
The additional unit goes to the service with the greater remaining time.
Final allocation:
- 97110: 2 units
- 97112: 1 unit
CMS uses this same allocation approach when explaining multiple timed services.
Looking up more cpt codes?
See 97110, 97530, and 50+ therapy procedure codes – with billing guidance and documentation tips in one place.
8-Minute Rule Examples for Therapy Billing
Worked examples make the rule easier to apply than memorizing the chart alone.
Example 1: Two Timed Therapy Services
15 minutes Therapeutic Activities (97530)
10 minutes Therapeutic Exercise (97110)
Total timed treatment:
15 + 10 = 25 minutes
The Medicare chart allows:
23-37 minutes = 2 units
Allocation:
- 97530 has one complete 15-minute block, so it receives 1 unit.
- 97110 has the greatest remaining time, so it receives the second unit.
Billing result:
- 97530: 1 unit
- 97110: 1 unit
Example 2: One Unit Across Multiple Timed Services
12 minutes Manual Therapy (97140)
8 minutes Therapeutic Activities (97530)
Total timed treatment:
12 + 8 = 20 minutes
20 minutes supports:
1 timed unit
Neither service contains a complete 15-minute block, so compare the service minutes.
Manual therapy has the greater number of minutes.
Billing result:
-
- 97140: 1 unit
The therapeutic-activity minutes should still be documented, even though the available timed-unit total does not permit a separate unit for that code.
The important point is that the unit is allocated according to the actual treatment time, not according to which CPT code has a higher reimbursement value. CMS requires timed units to be allocated according to the services and minutes provided.
Example 3: Equal Remaining Minutes
20 minutes Neuromuscular Re-education (97112)
20 minutes Therapeutic Exercise (97110)
Total:
40 timed minutes
40 minutes supports:
3 timed units
Each service contains:
15-minute block + 5 remaining minutes
Two units are therefore already assigned:
- 97112: 1
- 97110: 1
One unit remains.
Because each service has the same amount of remaining time, CMS guidance permits the additional unit to be assigned to either service in this specific tie situation.
The result may therefore be either:
- 97112: 2 units + 97110: 1 unit
or
- 97112: 1 unit + 97110: 2 units
The documentation still needs to support all services provided.
Example 4: A Timed and an Untimed Service
Suppose a visit includes:
10 minutes Therapeutic Exercise (97110)
plus an applicable untimed service
The untimed service does not add minutes to the timed-unit calculation.
The timed calculation remains:
10 timed minutes = 1 timed unit of 97110
The untimed service is billed according to its own code-specific requirements. CMS specifically separates untimed-service minutes from the total used to calculate timed units.
How Does the Remainder Rule Work?
The term “remainder” refers to the minutes left over after complete 15-minute blocks have been identified for each timed service.
Consider the CMS example:
24 minutes Neuromuscular Re-education (97112)
23 minutes Therapeutic Exercise (97110)
Total:
47 minutes = 3 timed units
Break each code into full blocks:
- 97112 = 15 + 9 remaining
- 97110 = 15 + 8 remaining
Each code earns one unit from its complete 15-minute block.
One unit remains.
Because 97112 has 9 remaining minutes compared with 8 for 97110, the third unit is allocated to 97112.
Final billing:
- 97112: 2 units
- 97110: 1 unit
This is why simply dividing the total visit time by 15 is not enough when multiple timed services are involved.
You need both:
the total timed minutes
and
the minutes associated with each CPT code.
Timed vs. Untimed Therapy Services: Why the Difference Matters
Timed and untimed services should not be treated the same way when calculating Medicare therapy units.
Timed services include a specific time interval in their code definition and use the applicable timed-unit calculation.
Untimed services do not use the 8-minute-rule calculation. CMS notes that these services are billed according to the number of times the service is performed, often once per day, subject to the requirements of the individual code and payer policy.
If a visit contains both timed and untimed services:
-
- Document both.
- Include only applicable timed-service minutes in the timed-unit calculation.
- Do not add evaluation or other untimed minutes simply to reach another timed-unit threshold.
CMS provides examples showing that untimed evaluation or modality minutes remain part of total treatment time but are excluded from Timed Code Treatment Minutes when calculating the timed units.
Does Every Insurance Company Use the Medicare 8-Minute Rule?
No.
The 8-minute rule described in this guide is the Medicare methodology for applicable outpatient therapy services billed in 15-minute units.
A commercial insurer, Medicaid program, workers’ compensation plan, or other payer may have different billing policies.
Some payers may follow Medicare’s methodology. Others may apply different rules.
Do not assume that one timed-unit calculation applies to every payer.
Practices should verify the billing requirements for the patient’s specific payer and contract before applying Medicare’s methodology to non-Medicare claims.
This is also why having payer-specific billing rules in your practice workflow can be more useful than relying on therapists to remember which calculation applies to every patient.
Still Calculating 8-Minute Rule Units Manually?
HelloNote helps therapy practices apply the right billing rule at the case level, including Medicare’s 8-minute rule, while keeping treatment time, CPT codes, documentation, and billing connected in one workflow.
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Frequently Asked Questions About the 8-Minute Rule
What is the 8-minute rule for physical therapy?
The Medicare 8-minute rule determines the number of billable units for applicable physical therapy services reported in 15-minute increments.
One timed unit begins at 8 minutes. Two units begin at 23 minutes, and three units begin at 38 minutes. When multiple timed services are provided, the total timed minutes determine the total units available.
How many units can you bill for 30 minutes of therapy?
Thirty total timed treatment minutes supports 2 timed units under Medicare's 8-minute-rule chart.
The 2-unit range is 23 through 37 timed minutes. When more than one timed service is provided, the two units must then be allocated according to the minutes associated with each CPT code.
How many units can you bill for 45 minutes of therapy?
Forty-five total timed treatment minutes supports 3 timed units under Medicare's 8-minute rule.
The 3-unit range is 38 through 52 timed minutes. The specific CPT codes receiving those units depend on how the 45 minutes were distributed among the timed services.
What happens if therapy lasts only 7 minutes?
Seven total timed treatment minutes does not support one timed unit under the Medicare 8-minute-rule calculation.
At least 8 timed minutes are required before one applicable 15-minute timed unit may be billed.
Do untimed CPT codes count toward the 8-minute rule?
No. Minutes associated with untimed services are not added to Timed Code Treatment Minutes when determining timed units.
Untimed services are reported according to their own code-specific and payer requirements.
Do all insurance companies follow the 8-minute rule?
No. Medicare uses the 8-minute-rule methodology for applicable timed therapy services, but other payers may use different billing rules.
Practices should verify the patient's payer policy rather than assuming Medicare's calculation applies universally.
How do you allocate units when multiple timed CPT codes are performed?
First determine the total billable units from the combined timed minutes, then allocate those units according to the minutes spent on each service.
Complete 15-minute blocks are allocated first. If another unit remains available, compare the remaining minutes and allocate that unit to the appropriate service with the greater remaining treatment time.
Can an EMR help apply the 8-minute rule?
Yes. A therapy-specific EMR can incorporate the applicable billing rule into the patient's case workflow rather than requiring therapists to rely entirely on manual calculations.
HelloNote currently provides a case-level 8-Minute Rule setting for Medicare billing and a separate AMA Billing setting.
Make Timed Therapy Billing Easier to Manage
The most important part of the 8-minute rule is not memorizing a table.
It is understanding the sequence:
Document the actual skilled treatment minutes.
Separate timed from untimed services.
Total the applicable timed minutes.
Determine the available units.
Allocate those units to the correct services.
Make sure the documentation supports what is billed.
That process becomes more important as a practice adds clinicians, patients, and payer types.
If your team is still manually checking timed-unit calculations across every Medicare visit, it may be time to look at whether your EMR is supporting the billing workflow or simply storing the final numbers.
