CPT 90834 + ICD-10 F34.1: Dysthymic disorder (persistent depressive disorder)
Psychotherapy, 45 minutes billed with Dysthymic disorder (persistent depressive disorder) — documentation requirements, denial reasons, modifiers, and reimbursement context.
CPT Code
90834
Psychotherapy, 45 minutes
ICD-10 Code
F34.1
Dysthymic disorder (persistent depressive disorder)
Common Modifiers
Compatibility Notes
Appropriate for 45-minute psychotherapy sessions in the long-term treatment of persistent depressive disorder. CBASP (Cognitive Behavioral Analysis System of Psychotherapy), behavioral activation, and CBT are evidence-based approaches. Annual authorization renewals are common given the chronic course.
Documentation Required
- ✓Session start and stop times confirming 38–52 minutes
- ✓PDD diagnosis with 2+ year chronic course documented
- ✓PHQ-9 tracking over time
- ✓Treatment modality and session goals
- ✓Risk assessment
Common Denial Reasons
- ✗Duration of symptoms not documented to confirm 2-year minimum
- ✗Payer prefers recurrent MDD codes — document the distinction
- ✗Session time outside 38–52 minute range
Applicable Modifiers
Reimbursement Notes
OON UCR $100–$165. PDD is a chronic condition; payers should authorize ongoing therapy under mental health parity. Document clinical progress and functional improvement at each renewal.
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