CPT code
Multiple-family group psychotherapy
In the order to send them
Why these codes
Therapy formats other than one-on-one; the same two benefits answer them.
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