Then the group exercise code 97150 is used do to the nature of these practices. The group code applies when one therapist is directing two or more patients at the same time. When billing Medicare for these services, CCI Edits may apply. Then the 59 modifier, which denotes distinct and separate services, may be used to bill for both aquatic therapy and group therapy on the same date of service. Your documentation must represent the services billed were both one on one and group.
Documentation seems to be an ongoing concern for payers reviewing aquatic physical therapy claims.
You may also want to contact the APTA Section on Aquatic Therapy for more detailed information.