The remark code, N88, will warn non-home health providers
that the payment for this claim is being made conditionally
and may be subject to recoupment during any post payment
review process.

The remark code states:

N88 - This payment is being made conditionally.
A HHA episode of care notice has been filed
for this patient. When a patient is treated
under a HHA episode of care, consolidated
billing requires that certain therapy services
and supplies be included in the HHA's payment.
This payment will need to be recouped from you
if the patient is concurrently receiving
treatment under a HHA episode of care.

Looks like the patient is under the care of a home health agency.