F61

F61 is a diagnostic code in the ICD-10 classification used to categorize mixed disturbances of personality and behavior. It sits within the broader group of codes for mental and behavioral disorders (codes F60–F69) and is applied when a patient’s presentation includes features from more than one personality disorder or a combination of personality and behavioral disturbances that does not fit a single, well-defined disorder.

Clinical use and interpretation: The category is intended for cases in which the patient shows a persistent pattern of inner experience and outward behavior that deviates from cultural expectations and cannot be adequately captured by a single named personality disorder. The presentation is typically heterogeneous, with traits drawn from multiple personality disorder spectra and varying behavioral manifestations. Clinicians use F61 when no single diagnostic category fully accounts for the observed pattern.

Diagnostic considerations: ICD-10 coding relies on clinician judgment and standard diagnostic criteria. F61 is not a stand-alone description of a specific symptom set but a way to code mixed or overlapping personality features when a single disorder fails to explain the full clinical picture. It is distinct from codes for specific personality disorders (such as F60) and from other mixed or acquired conditions affecting personality (for example, F62, enduring personality changes after an experience).

See also: ICD-10-CM/ICD-11 classifications, F60 (specific personality disorders), F62 (enduring personality changes), and general topics on personality disorders.

Note: ICD-10 and ICD-11 frameworks differ in structure and terminology; F61 is part of the ICD-10 coding system.