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CPT 90837 + ICD-10 F41.1: Generalized Anxiety Disorder

Psychotherapy, 60 minutes billed with Generalized Anxiety Disorder — documentation requirements, denial reasons, modifiers, and reimbursement context.

CPT Code

90837

Psychotherapy, 60 minutes

ICD-10 Code

F41.1

Generalized Anxiety Disorder

Common Modifiers

95 GT

Compatibility Notes

This is one of the most commonly billed combinations in outpatient therapy. CPT 90837 with F41.1 is accepted by virtually all commercial insurers and most Medicaid managed care plans. No special restrictions apply. Medical necessity is straightforward when session notes document ongoing worry, somatic symptoms, and functional impairment.

Documentation Required

✓Session start and stop times confirming 53+ minutes of psychotherapy
✓Active DSM-5 diagnosis of Generalized Anxiety Disorder (F41.1) with clinical rationale
✓Description of therapeutic modality used (e.g., CBT, ACT, exposure-based techniques)
✓Patient-reported symptom severity and functional impact (e.g., GAD-7 score or narrative equivalent)
✓Treatment plan goals addressed during the session
✓Provider NPI and license number on the superbill

Common Denial Reasons

✗Session time documented as fewer than 53 minutes — use 90834 (38–52 min) instead
✗Diagnosis coded as F41.9 (Anxiety disorder, unspecified) when F41.1 criteria are clearly met — specificity matters
✗Missing or generic treatment plan that does not demonstrate medical necessity
✗Frequency limit exceeded without a prior-authorization on file
✗Wrong rendering provider NPI on claim

Applicable Modifiers

Modifier 95 Modifier GT

Reimbursement Notes

Out-of-network UCR for 90837 with F41.1 typically ranges from $130–$210 per session depending on geographic region. OON reimbursement from commercial plans averages 50–70% of UCR after the deductible is met. Some PPO plans reimburse at a fixed percentage of Medicare rates (often 110–130%). Always verify the patient's OON mental health benefits before the first session.

Related Billing Guides

CPT 90837Psychotherapy, 60 minutes — full billing guide F41.1Generalized Anxiety Disorder — full billing guide

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