Mental Health ICD-10 Codes & CPT Codes
Mental health billing requires precise ICD-10-CM coding for diagnoses including depression, anxiety, PTSD, ADHD, and substance use disorders. Codes below reflect FY2026 ICD-10-CM (CMS, effective October 1, 2025) and CPT 2026 (AMA, effective January 1, 2026) — including the new unspecified-depression and substance-use-remission diagnosis codes and the new CY2026 telehealth and Collaborative Care Model billing codes. FY2027 ICD-10-CM updates take effect October 1, 2026 and will be reflected here once finalized. This reference page lists the top diagnosis and procedure codes used by psychiatrists, psychologists, licensed clinical social workers, and mental health nurse practitioners across the United States.
FY 2027 ICD-10-CM (CMS, eff. 10/1/2026) · CPT 2026 (AMA) · All codes verified billable · Last verified: October 2026
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Top ICD-10 Codes for Mental Health
Source: CMS ICD-10-CM Official Code Set FY 2026
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Common CPT Codes for Mental Health Billing
*Approximate 2026 CMS national non-facility rate. Rates vary by geography, setting, and payer contract. Refer to the CMS Physician Fee Schedule for official rates.
Top Denial Reasons for Mental Health Claims
Medical Necessity Not Documented
Payers require clinical notes to substantiate the diagnosis severity and functional impairment justifying psychotherapy or psychiatric services. Ensure every session note includes presenting symptoms, clinical assessment, and treatment rationale linked to the primary ICD-10 diagnosis.
Missing or Incorrect Modifier on Telehealth Claims
Mental health telehealth claims for CPT codes 90832-90837 require modifier -GT or -95 depending on the payer; omitting it or using the wrong modifier results in automatic denial. Verify payer-specific telehealth modifier requirements before submitting and append place of service code 02 or 10 as required.
Diagnosis-Procedure Linkage Mismatch
Billing a psychotherapy CPT (e.g., 90837) without a primary mental health ICD-10 diagnosis — or pairing a psychiatric code with a non-qualifying Z-code only — triggers medical review and denial. Always link psychotherapy and psychiatric evaluation codes to a specific F-chapter diagnosis that directly supports the service billed.
Prior Authorization Not Obtained for Ongoing Therapy
Many commercial and Medicaid plans require prior authorization after an initial 6-12 session threshold, and claims beyond that limit are denied if reauthorization was not secured. Track authorization expiration dates proactively and submit reauthorization requests with updated progress notes at least 2 weeks before exhausting approved sessions.
Mental Health Billing & Coding Tips
- Specify episode type and severity for MDD: single vs. recurrent (F32.x vs. F33.x) and mild/moderate/severe.
- Document the specific anxiety disorder type — F41.1 (GAD), F41.0 (Panic), F40.10 (Social phobia) — rather than defaulting to F41.9.
- 90837 (60-min psychotherapy) reimburses higher than 90834 (45-min); document session length in minutes in the note.
- Substance use disorders (F10–F19) require specificity on substance type and the stage: abuse (F1x.1x), dependence (F1x.2x), or use (F1x.9x).
Related Resources
Related Specialties
Physicians and coders who visit this page also reference these specialty codes.
Frequently Asked Questions
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