Add-on and special codes can support accurate payment, but they are often misused. Using them correctly depends on both the situation and the documentation.
Interactive complexity
CPT 90785 is for sessions made more difficult by specific factors, such as managing conflict among the people involved in the session. It is not billed just because a session was hard. It also generally cannot be reported together with the psychotherapy for crisis codes, so check the CPT manual.
Crisis sessions
Psychotherapy for crisis (90839, with 90840 for each additional 30 minutes) is intended for urgent situations that need immediate attention, and the time requirements must be met.
Document the reason
Your note should state the specific factor or crisis and what you did, so another reader would understand why the code applied.
Confirm each payer’s policy before you start using these codes.