Master the CMS 8-minute rule for billing timed physical therapy services, including calculation examples and common mistakes to avoid.
The 8-minute rule is a CMS guideline that determines how many timed units a therapist can bill based on total treatment minutes. You need at least 8 minutes of a timed service to bill 1 unit. The rule applies to timed CPT codes like 97110 (Therapeutic Exercise), 97140 (Manual Therapy), and 97530 (Therapeutic Activities).
Use the total minutes of all timed services combined: 8-22 minutes = 1 unit, 23-37 minutes = 2 units, 38-52 minutes = 3 units, 53-67 minutes = 4 units. When billing multiple timed codes, allocate units to the services with the most minutes first (the 'rule of eights').
Morgan automatically tracks treatment time during documentation and calculates billable units using the 8-minute rule. Riley then validates the units during pre-scrub, flagging any discrepancies between documented time and billed units before claim submission.
Avoid these frequent errors: (1) Billing a unit for less than 8 minutes of service, (2) Counting untimed services (97530) in the timed calculation, (3) Rounding up when total minutes don't meet the threshold, (4) Not documenting start/end times for each service. PRACTIS prevents all of these automatically.
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