F42.9 — Obsessive-compulsive disorder, unspecified

F42.9

ICD-10 Chapter 5: Mental, Behavioral & Neurodevelopmental — illustrative image — Chapter 5: Mental, behavioral and neurodevelopmental disorders (F01–F99) — illustrative image

What this code means

Obsessive-compulsive disorder (OCD) involves intrusive unwanted thoughts and repetitive behaviours performed to relieve anxiety.

Also called: ocd, obsessive-compulsive disorder.

When this code is used

Used for obsessive-compulsive disorder when the type is not specified.

Where it sits in ICD-10-CM

Code F42.9 belongs to Chapter 5: Mental, behavioral and neurodevelopmental disorders, which covers codes F01–F99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

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Frequently asked questions

What is ICD-10-CM code F42.9?

F42.9 is the ICD-10-CM diagnosis code for “Obsessive-compulsive disorder, unspecified”. Obsessive-compulsive disorder (OCD) involves intrusive unwanted thoughts and repetitive behaviours performed to relieve anxiety.

When is code F42.9 used?

Used for obsessive-compulsive disorder when the type is not specified. It belongs to Chapter 5 of ICD-10-CM (Mental, behavioral and neurodevelopmental disorders).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.