Is this being billed for custom functional orthotics or an AFO?
Assuming your DPM dispensed the AFO, the reimbursement for time spent dispensing and fitting an AFO as well as how to break it in and use it and how to care for it is included in the reimbursement for the AFO itself.
The 97760 can be billed if an orthotist dispensed the device but gave no training nor fitting, which would be a very rare occurrence. In my experience, this is not a code a Podiatrist uses.
Since custom orthotics are not covered by Medicare, ALL services/treatments from dispensing to adjustments would be cash pay.