CPT 90837 + ICD-10 F32.9: Major depressive disorder, single episode, unspecified
Psychotherapy, 60 minutes billed with Major depressive disorder, single episode, unspecified — documentation requirements, denial reasons, modifiers, and reimbursement context.
CPT Code
90837
Psychotherapy, 60 minutes
ICD-10 Code
F32.9
Major depressive disorder, single episode, unspecified
Compatibility Notes
A high-volume combination. F32.9 is appropriate when the patient meets criteria for a single MDD episode but specifier severity (mild/moderate/severe) has not yet been determined or documented. Most insurers accept this pairing without prior authorization for the first 20–26 sessions per benefit year. Switch to a specifier code (F32.0–F32.5) when severity is established.
Documentation Required
- ✓Session start and stop times confirming 53+ minutes
- ✓Active MDD diagnosis with documented symptom constellation (depressed mood, anhedonia, sleep/appetite changes, concentration difficulties, etc.)
- ✓PHQ-9 or equivalent symptom severity tracking
- ✓Functional impairment noted (work, relationships, self-care)
- ✓Therapeutic interventions and patient response
- ✓Risk assessment (suicidal ideation screening) documented each session
Common Denial Reasons
- ✗Lack of documented symptom severity — unspecified codes increasingly scrutinized at audit
- ✗Missing risk assessment documentation, especially when concurrent F codes are present
- ✗Session time falling short of the 53-minute threshold for 90837
- ✗Benefit limit reached without updated authorization
Applicable Modifiers
Reimbursement Notes
OON reimbursement mirrors F41.1 rates — UCR $130–$210, commercial plans averaging 50–70% of UCR. Plans with carved-out behavioral health benefits (e.g., Optum, Beacon) may apply separate OON benefit rules with lower reimbursement floors.
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