Insomnia due to other mental disorder

This diagnosis code signifies a primary complaint of insomnia that is directly attributable to an underlying mental health condition other than substance use or a known physiological cause. The sleep disturbance is a symptom or consequence of a diagnosed psychiatric disorder, such as a mood disorder, anxiety disorder, or psychotic disorder.

Apply this code when documentation clearly links the patient's insomnia to a specific, co-occurring mental disorder. This is appropriate when the mental disorder is established as the causal factor for the sleep disturbance, and the insomnia is not better explained by another medical condition or substance use. Supporting documentation should include a diagnosis of both insomnia and the specific mental disorder, with a clear statement of their causal relationship.

• Always sequence the underlying mental disorder code first, followed by this code, to accurately reflect the etiology.
• Do not use this code if the insomnia is due to substance use; refer to codes in chapter 29 (F10-F19) for substance-induced sleep disorders.
• Ensure the documentation explicitly states the "due to" relationship between the mental disorder and the insomnia; mere co-occurrence is not sufficient.