CPT 90834 + ICD-10 F41.9: Anxiety disorder, unspecified
Psychotherapy, 45 minutes billed with Anxiety disorder, unspecified — documentation requirements, denial reasons, modifiers, and reimbursement context.
CPT Code
90834
Psychotherapy, 45 minutes
ICD-10 Code
F41.9
Anxiety disorder, unspecified
Common Modifiers
Compatibility Notes
Acceptable when a patient presents with clinically significant anxiety not yet meeting criteria for a specific anxiety disorder, or when the therapist is still in the diagnostic evaluation phase. Use only when a more specific code (F41.1, F40.10, F43.10) cannot yet be assigned. Some payers prefer specificity and may query unspecified codes during utilization review.
Documentation Required
- ✓Session start and stop times confirming 38–52 minutes
- ✓Clinical rationale for unspecified designation (differential still in progress, or mixed presentation)
- ✓Anxiety symptom description and functional impairment
- ✓Plan to refine diagnosis within 2–4 sessions
Common Denial Reasons
- ✗Unspecified code used chronically after diagnosis should have been clarified — payers may deny after 4–6 sessions if the code remains unspecified
- ✗No documentation of diagnostic reasoning for choosing F41.9 over a specific code
Applicable Modifiers
Reimbursement Notes
Reimbursement mirrors standard 90834 rates ($100–$165 UCR OON). No specific reimbursement penalty for unspecified codes in most commercial plans, but chronic use invites audit.
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