CPT 90791 is the code for psychiatric diagnostic evaluations, but many psychiatrists face denials due to documentation gaps or misuse. This guide explains when to use 90791, what insurers require, and best practices to bill correctly while keeping your practice compliant.

Mental health billing is far more complex than general medical billing due to varied payer rules, CPT codes, and documentation demands. This guide explains the challenges and offers practical strategies—workflows, training, technology, and outsourcing—that help providers simplify billing and reduce denials.