Underdosing of phenothiazine antipsychot/neurolept, sequela

This code signifies a patient's underdosing of phenothiazine antipsychotics or neuroleptics, leading to a current health problem or complication. It indicates that the patient did not receive enough of the prescribed medication, and this insufficiency has resulted in a sequela, meaning a lasting effect or condition.

Use this code when documentation clearly links a patient's current symptoms, conditions, or adverse effects to a historical or ongoing underdosing of phenothiazine antipsychotics. This could include scenarios where psychotic symptoms have relapsed or worsened due to insufficient medication intake over time. It is appropriate when the underdosing is not an acute event but has long-term consequences.

• Always sequence this code after the code(s) for the specific sequela or condition resulting from the underdosing.
• Ensure the documentation explicitly states "underdosing" and identifies the medication as a phenothiazine antipsychotic or neuroleptic.
• Verify that the "S" seventh character is appropriate, indicating a sequela, not an initial encounter or subsequent encounter for an acute event.