CPT 90837 + ICD-10 F41.9: Anxiety disorder, unspecified
Psychotherapy, 60 minutes billed with Anxiety disorder, unspecified — documentation requirements, denial reasons, modifiers, and reimbursement context.
CPT Code
90837
Psychotherapy, 60 minutes
ICD-10 Code
F41.9
Anxiety disorder, unspecified
Compatibility Notes
Used when the anxiety presentation does not yet meet criteria for a specific disorder or when the clinician is mid-assessment. Most payers accept F41.9 for the first few sessions but expect diagnostic refinement. After 4–6 sessions, continued use of the unspecified code may prompt a utilization review request.
Documentation Required
- ✓Session start and stop times confirming 53+ minutes
- ✓Clinical rationale for the unspecified designation with differential diagnosis noted
- ✓Anxiety symptom description and functional impairment
- ✓Timeline for diagnostic clarification documented in the treatment plan
- ✓Provider NPI and license on the superbill
Common Denial Reasons
- ✗Chronic use of unspecified code when a more specific anxiety diagnosis could be assigned
- ✗Notes do not describe anxiety symptoms specifically enough to justify the diagnosis
- ✗Session time below 53 minutes without switching to 90834
Applicable Modifiers
Reimbursement Notes
OON UCR is $130–$210, consistent with all 90837 pairings. No payer-specific reimbursement penalty for F41.9, but prolonged use invites audit and potential down-coding requests.
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