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December 2016 Texas Medicaid Provider Procedures Manual

Physical Therapy, Occupational Therapy, and Speech Therapy Services Handbook : 7 Claims Filing and Reimbursement : 7.2 Reimbursement/Billing Guidelines : 7.2.1 Method for Counting Minutes for Timed Procedure Codes in 15-Minute Units

7.2.1
Modifiers GP, GO, and GN are required on all claims except when billing evaluation and reevaluation procedure codes. The AT modifier must be included on claims for acute therapy services.
All claims for reimbursement of procedure codes paid in 15 minute increments are based on the actual amount of billable time associated with the service. For those services for which the unit of service is 15 minutes (1 unit = 15 minutes), partial units should be rounded up or down to the nearest quarter hour.
To calculate billing units, count the total number of billable minutes for the calendar day for the client, and divide by 15 to convert to billable units of service. If the total billable minutes are not divisible by 15, the minutes are converted to one unit of service if they are greater than seven and converted to zero units of service if they are seven or fewer minutes.
For example, 68 total billable minutes/15 = 4 units + 8 minutes. Since the 8 minutes are more than 7 minutes, those 8 minutes are converted to one unit. Therefore, 68 total billable minutes = 5 units of service.
Time intervals for 1 through 8 units are as follows:
 

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