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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.

2026-03-28 · 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.

2026-03-28 · 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.

2026-03-28 · 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.

2026-03-28 · 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.

2026-03-28 · 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.

2026-03-28 · 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.

2026-03-28 · 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.

2026-03-28 · 5 min read

substance-abuse

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.

2026-03-25 · 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.

2026-03-07 · 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.

2026-03-06 · 4 min read