CPT code
Psychotherapy, about 30 minutes
In the order to send them
Why these codes
Talk therapy: mental health, psychotherapy, then outpatient provider.
If a payer returns nothing
Payers don't all answer every service type. Send 30 (Health Benefit Plan Coverage) for the plan's general benefits.
Sources
X12 HIPAA 5010 service type code definitions; VerifyTX billing practice