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ICD-10 Code Guides

Mental health ICD-10 diagnosis codes explained for therapists — clinical criteria, DSM-5 cross-references, and superbill usage.

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ICD-10 F33: Recurrent Major Depressive Disorder — Billing Guide

F33.0, F33.1, F33.2, and F33.9 explained — how recurrent MDD (F33) differs from a single episode (F32), severity specifiers, and which CPT codes to pair with it.

March 28, 2026 · 5 min read

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ICD-10 F40.10 / F40.11: Social Anxiety Disorder Billing Guide

Social phobia unspecified (F40.10) vs generalized (F40.11) — clinical distinctions, performance-only specifier, CBT documentation, and CPT code pairing.

March 28, 2026 · 5 min read

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ICD-10 F42: OCD Diagnosis Codes and Therapy Billing Guide

F42.2, F42.3, F42.4, and F42.9 explained — OCD subcode selection, ERP treatment implications, hoarding disorder billing distinctions, and CPT code pairings.

March 28, 2026 · 5 min read

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ICD-10 F50: Eating Disorder Diagnosis Codes — Billing Guide for Therapists

Anorexia (F50.01/F50.02), bulimia (F50.2), ARFID (F50.82), and binge eating (F50.81) — code selection, insurance coverage challenges, and medical monitoring documentation.

March 28, 2026 · 6 min read

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ICD-10 F60.3: Borderline Personality Disorder Billing Guide

How to bill F60.3 (BPD) — DBT treatment billing, high-frequency session documentation, CPT code pairing with 90837 and 90847, and insurance prior auth realities.

March 28, 2026 · 5 min read

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ICD-10 F34.1: Persistent Depressive Disorder (Dysthymia) Billing Guide

F34.1 (persistent depressive disorder / dysthymia) — how it differs from F32 and F33, long-term treatment billing implications, and documentation requirements.

March 28, 2026 · 4 min read

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ICD-10 F84.0: Autism Spectrum Disorder Billing Guide for Therapists

ASD (F84.0) billing — when to use ABA CPT codes (97151–97158) vs psychotherapy codes, co-occurring diagnoses, and coverage differences by payer.

March 28, 2026 · 6 min read

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ICD-10 F94.1 / F94.2: Reactive Attachment and DSED Billing Guide

F94.1 (reactive attachment disorder) and F94.2 (disinhibited social engagement disorder) — child therapy billing context, family session CPT codes, and documentation.

March 28, 2026 · 5 min read

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Substance Abuse Therapy Billing: CPT Codes and Coverage

CPT codes for substance abuse therapy including 90837, 90853 group sessions, ICD-10 F10–F19 code breakdown, and how mental health parity law applies.

March 25, 2026 · 6 min read

Mental health counselor supporting a patient with anxiety

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ICD-10 F41.1: Generalized Anxiety Disorder — Billing Guide for Therapists

F41.1 is the most commonly billed mental health diagnosis code. Learn when to use it, how it differs from F41.0 and F41.9, and documentation requirements.

March 7, 2026 · 4 min read

Therapist speaking with a patient about depression

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ICD-10 F32: Major Depressive Disorder — Therapist Billing Reference

A complete reference for F32 subcodes: F32.0 through F32.9, when to use F33 (recurrent), and why severity specificity matters for insurance processing.

March 6, 2026 · 4 min read