There have been caps for Medicare Part B OP therapy for a long time though the amounts have changed and PT, OT and SP have not been exempt.
What a facility will charge for an OP visit may be $650 but what is allowable and reimbursed under Medicare is significantly less.
The total reimbursed amount will vary depending on the CPT-4 coding that the therapist use.
That is not what the gov site says. It says with Balanced Budget Act of 1997, caps for other services were added but not for Outpatient centers.