Oth personality & behavrl disord due to known physiol cond

This code signifies personality changes or behavioral disturbances that are directly attributable to an underlying medical condition affecting brain function. These are not primary psychiatric disorders but rather secondary manifestations of a physiological derangement. The symptoms often involve alterations in mood, impulse control, social conduct, or cognitive function.

Apply this code when documentation clearly links a patient's new-onset or exacerbated personality/behavioral issues to a specific, diagnosed physiological condition (e.g., traumatic brain injury, stroke, neurodegenerative disease, endocrine disorder, or substance-induced brain damage). The physician's notes should explicitly state the causal relationship and rule out other primary psychiatric diagnoses.

• Always sequence the underlying physiological condition as the primary diagnosis, followed by this code.
• Ensure documentation specifies the "known physiological condition" and the direct link to the behavioral changes.
• Differentiate from primary mental health disorders; this code requires an organic etiology.