Other persistent mental disorders due to conditions classified elsewhere

This code signifies mental disorders that are chronic or long-lasting and are directly caused by another underlying medical condition, neurological disorder, or substance use. These are not transient reactions but rather persistent psychiatric symptoms resulting from a primary physical etiology.

Assign this code when documentation clearly links a persistent mental disorder (e.g., psychosis, mood disorder, personality change) to a specific medical condition (e.g., traumatic brain injury, endocrine disorder, autoimmune disease) that is coded elsewhere. Ensure the mental disorder is not better classified as a primary psychiatric condition.

• Always sequence the underlying medical condition as the primary diagnosis, followed by this code.
• Avoid using this code for acute delirium or transient mental status changes; those have specific codes.
• Ensure the physician's documentation explicitly states the causal relationship between the physical condition and the persistent mental disorder.