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F42.9 · Billable

2026 ICD-10-CM Diagnosis Code F42.9

Obsessive-compulsive disorder, unspecified

About F42.9

Code

F42.9

Description

Obsessive-compulsive disorder, unspecified

Billable

Yes — billable on its own

Parent code

F42 (Obsessive-compulsive disorder)

Category

F40-F49 — Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders

Set

ICD-10-CM 2026

Clinical context

Inherited from F42 (Obsessive-compulsive disorder)

F42 covers obsessive-compulsive and related disorders — including OCD itself, hoarding disorder (F42.3), and excoriation/skin-picking (F42.4). Document the obsession-compulsion cycle, time spent on rituals per day, level of insight, and functional impairment. Exposure and response prevention (ERP) is the first-line evidence-based treatment.

Code details

Code attributes

  • Non-billable/Non-specific code

Coding rules

  • Quantify symptom burden — Y-BOCS scores at intake and at follow-up document severity and treatment response objectively.
  • Specify the subtype — F42.3 (hoarding) and F42.4 (skin-picking) are distinct disorders with their own treatment protocols — code them specifically rather than collapsing into F42.9.
  • Capture insight level — Document whether the patient recognizes their obsessions/compulsions as excessive. Poor insight affects both prognosis and treatment planning.

Sources

  • Centers for Medicare & Medicaid Services — 2026 ICD-10-CM
  • AAPC — ICD-10-CM Code Lookup
  • CDC — ICD-10-CM Official Guidelines for Coding and Reporting

This reference is provided for billing and documentation guidance only. It is not medical advice. For clinical decision-making, consult the current CMS ICD-10-CM Official Guidelines for Coding and Reporting, and verify code applicability against the patient's documented clinical findings.

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